1  452 126 CHANGES IN HEART RATE VARIABILITY AFTER YOGA ARE DEPENDENT ON HEART RATE VARIABILITY AT BASELINE AND DURING YOGA: A STUDY SHOWING AUTONOMIC NORMALIZATION EFFECT IN YOGA-NAIVE AND EXPERIENCED SUBJECTS. BACKGROUND: YOGA THERAPY IS WIDELY APPLIED TO THE MAINTENANCE OF HEALTH AND TO TREATMENT OF VARIOUS ILLNESSES. PREVIOUS RESEARCHES INDICATE THE INVOLVEMENT OF AUTONOMIC CONTROL IN ITS EFFECTS, ALTHOUGH THE GENERAL AGREEMENT HAS NOT BEEN REACHED REGARDING THE ACUTE MODULATION OF AUTONOMIC FUNCTION. AIM: THE PRESENT STUDY AIMED AT REVEALING THE ACUTE EFFECT OF YOGA ON THE AUTONOMIC ACTIVITY USING HEART RATE VARIABILITY (HRV) MEASUREMENT. METHODS: TWENTY-SEVEN HEALTHY CONTROLS PARTICIPATED IN THE PRESENT STUDY. FIFTEEN OF THEM (39.5 +/- 8.5 YEARS OLD) WERE NAIVE AND 12 (45.1 +/- 7.0 YEARS OLD) WERE EXPERIENCED IN YOGA. YOGA SKILLS INCLUDED BREATH AWARENESS, TWO TYPES OF ASANA, AND TWO TYPES OF PRANAYAMA. HRV WAS MEASURED AT THE BASELINE, DURING YOGA, AND AT THE RESTING STATE AFTER YOGA. RESULTS: IN BOTH YOGA-NAIVE AND EXPERIENCED PARTICIPANTS, THE CHANGES IN LOW-FREQUENCY (LF) COMPONENT OF HRV AND ITS RATIO TO HIGH-FREQUENCY (HF) COMPONENT (LF/HF) AFTER YOGA WERE FOUND TO BE CORRELATED NEGATIVELY WITH THE BASELINE DATA. THE CHANGES IN LF AFTER YOGA WERE ALSO CORRELATED WITH LF DURING YOGA. THE CHANGES IN HF AS WELL AS THE RAW HRV DATA AFTER YOGA WERE NOT RELATED TO THE BASELINE HRV OR THE HRV DURING YOGA. CONCLUSION: THE RESULTS INDICATE THAT YOGA LEADS TO AN INCREASE IN LF WHEN LF IS LOW AND LEADS TO A DECREASE IN LF WHEN IT IS HIGH AT THE BASELINE. THIS NORMALIZATION OF LF IS DEPENDENT ON THE AUTONOMIC MODULATION DURING YOGA AND MAY UNDERLIE THE CLINICAL EFFECTIVENESS OF YOGA THERAPY BOTH IN YOGA-NAIVE AND EXPERIENCED SUBJECTS.	2020	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          
2  297  44 ALTERNATE NOSTRIL BREATHING AT DIFFERENT RATES AND ITS INFLUENCE ON HEART RATE VARIABILITY IN NON PRACTITIONERS OF YOGA. INTRODUCTION: HEART RATE VARIABILITY IS A MEASURE OF MODULATION IN AUTONOMIC INPUT TO THE HEART AND IS ONE OF THE MARKERS OF AUTONOMIC FUNCTIONS. THOUGH THERE ARE MANY STUDIES ON THE LONG TERM INFLUENCE OF BREATHING ON HRV (HEART RATE VARIABILITY) THERE ARE ONLY A FEW STUDIES ON THE IMMEDIATE EFFECT OF BREATHING ESPECIALLY ALTERNATE NOSTRIL BREATHING ON HRV. THIS STUDY FOCUSES ON THE IMMEDIATE EFFECTS OF ALTERNATE NOSTRIL BREATHING AND THE INFLUENCE OF DIFFERENT BREATHING RATES ON HRV. MATERIALS AND METHODS: THE STUDY WAS DONE ON 25 SUBJECTS IN THE AGE GROUP OF 17-35 YEARS. ECG AND RESPIRATION WERE RECORDED BEFORE INTERVENTION AND IMMEDIATELY AFTER THE SUBJECTS WERE ASKED TO PERFORM ALTERNATE NOSTRIL BREATHING FOR FIVE MINUTES. RESULTS: LOW FREQUENCY (LF) WHICH IS A MARKER OF SYMPATHETIC ACTIVITY INCREASED, HIGH FREQUENCY (HF) WHICH IS A MARKER OF PARASYMPATHETIC ACTIVITY DECREASED AND THEIR RATIO LF/HF WHICH IS A MARKER OF SYMPATHO/VAGAL BALANCE INCREASED IMMEDIATELY AFTER 6 AND 12 MINUTES IN COMPARISON TO BASELINE VALUES WHEREAS THERE WAS NO SIGNIFICANT DIFFERENCE IN THE MEANS OF THESE COMPONENTS WHEN BOTH 6 AND 12 MINUTES WERE COMPARED. CONCLUSION: IMMEDIATE EFFECTS OF ALTERNATE NOSTRIL BREATHING ON HRV IN NON PRACTITIONERS OF YOGIC BREATHING ARE VERY DIFFERENT FROM THE LONG TERM INFLUENCE OF YOGIC BREATHING ON HRV WHICH SHOW A PREDOMINANT PARASYMPATHETIC INFLUENCE ON THE HEART.	2016	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
3 1318  42 HEART RATE VARIABILITY IN CHRONIC LOW BACK PAIN PATIENTS RANDOMIZED TO YOGA OR STANDARD CARE. BACKGROUND: CHRONIC PAIN CAN ALTER THE AUTONOMIC BALANCE WITH INCREASED SYMPATHETIC ACTIVITY REFLECTED IN ALTERED HEART RATE VARIABILITY (HRV). IT HAS BEEN PROPOSED THAT YOGA CAN BE USEFUL TO CORRECT THE AUTONOMIC IMBALANCE IN PATIENTS WITH CHRONIC PAIN WHO HAVE REDUCED HRV. METHODS AND DESIGNS: IN THE PRESENT RANDOMIZED CONTROLLED TRIAL 62 PATIENTS WITH CHRONIC LOW BACK PAIN ASSOCIATED WITH ALTERED ALIGNMENT OF INTERVERTEBRAL DISCS (AGED BETWEEN 20 AND 45 YEARS, 32 MALES) WERE RANDOMIZED TO 2 GROUPS. ONE GROUP RECEIVED YOGA FOR 3 MONTHS WHILE THE OTHER GROUP CARRIED OUT STANDARD MEDICAL CARE BASED ON THE PHYSICIAN'S ADVICE. THE DURATION WAS THE SAME, I.E., 3 MONTHS. THE HEART RATE VARIABILITY AND RATE OF RESPIRATION WERE ASSESSED AT BASELINE AND AT THE END OF 3 MONTHS. RESULTS: THERE WAS A SIGNIFICANT DIFFERENCE IN THE BASELINE (PRE) VALUES BETWEEN GROUPS (P = 0.008) FOR RESPIRATION RATE WHICH WAS HIGHER IN THE YOGA GROUP. THE CHANGES REPORTED BELOW ARE PRE-POST COMPARISONS WITHIN EACH GROUP. THE YOGA GROUP SHOWED A SIGNIFICANT (P < 0.05; REPEATED MEASURES ANOVA, POST-HOC ANALYSES) DECREASE IN THE LF POWER OF HRV, RATE OF RESPIRATION AND A SIGNIFICANT INCREASE IN THE HF POWER OF HRV AND IN THE PNN50. CONCLUSION: THE RESULTS SUGGEST THAT YOGA PRACTICE CAN SHIFT THE AUTONOMIC BALANCE TOWARDS VAGAL DOMINANCE IN PATIENTS WITH CHRONIC LOW BACK PAIN ASSOCIATED WITH ALTERED ALIGNMENT OF INTERVERTEBRAL DISCS. TRIAL REGISTRATION: THE STUDY IS REGISTERED WITH THE CLINICAL TRIALS REGISTRY OF INDIA ( CTRI/2012/11/003094 ) AND CAN BE ACCESSED AT.	2016	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
4 2863  36 YOGA-BASED GUIDED RELAXATION REDUCES SYMPATHETIC ACTIVITY JUDGED FROM BASELINE LEVELS. 35 MALE VOLUNTEERS WHOSE AGES RANGED FROM 20 TO 46 YEARS WERE STUDIED IN TWO SESSIONS OF YOGA-BASED GUIDED RELAXATION AND SUPINE REST. ASSESSMENTS OF AUTONOMIC VARIABLES WERE MADE FOR 15 SUBJECTS, BEFORE, DURING, AND AFTER THE PRACTICES, WHEREAS OXYGEN CONSUMPTION AND BREATH VOLUME WERE RECORDED FOR 25 SUBJECTS BEFORE AND AFTER BOTH TYPES OF RELAXATION. A SIGNIFICANT DECREASE IN OXYGEN CONSUMPTION AND INCREASE IN BREATH VOLUME WERE RECORDED AFTER GUIDED RELAXATION (PAIRED T TEST). THERE WERE COMPARABLE REDUCTIONS IN HEART RATE AND SKIN CONDUCTANCE DURING BOTH TYPES OF RELAXATION. DURING GUIDED RELAXATION THE POWER OF THE LOW FREQUENCY COMPONENT OF THE HEART-RATE VARIABILITY SPECTRUM REDUCED, WHEREAS THE POWER OF THE HIGH FREQUENCY COMPONENT INCREASED, SUGGESTING REDUCED SYMPATHETIC ACTIVITY. ALSO, SUBJECTS WITH A BASELINE RATIO OF LF/HF > 0.5 SHOWED A SIGNIFICANT DECREASE IN THE RATIO AFTER GUIDED RELAXATION, WHILE SUBJECTS WITH A RATIO < OR = 0.5 AT BASELINE SHOWED NO SUCH CHANGE. THE RESULTS SUGGEST THAT SYMPATHETIC ACTIVITY DECREASED AFTER GUIDED RELAXATION BASED ON YOGA, DEPENDING ON THE BASELINE LEVELS.	2002	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
5 2727  45 YOGA NIDRA RELAXATION INCREASES HEART RATE VARIABILITY AND IS UNAFFECTED BY A PRIOR BOUT OF HATHA YOGA. OBJECTIVE: THE MEASUREMENT OF HEART RATE VARIABILITY (HRV) IS OFTEN APPLIED AS AN INDEX OF AUTONOMIC NERVOUS SYSTEM (ANS) BALANCE AND, THEREFORE, MYOCARDIAL STABILITY. PREVIOUS STUDIES HAVE SUGGESTED THAT RELAXATION OR MIND-BODY EXERCISE CAN INFLUENCE ANS BALANCE POSITIVELY AS MEASURED BY HRV BUT MAY ACT VIA DIFFERENT MECHANISMS. NO STUDIES, TO THE AUTHORS' KNOWLEDGE, HAVE EXAMINED THE ACUTE RESPONSE IN HRV TO INTERVENTIONS COMBINING RELAXATION AND MIND-BODY EXERCISE. THE OBJECTIVE OF THIS STUDY WAS TO COMPARE THE ACUTE HRV RESPONSES TO YOGA NIDRA RELAXATION ALONE VERSUS YOGA NIDRA RELAXATION PRECEDED BY HATHA YOGA. DESIGN: THIS WAS A RANDOMIZED COUNTER-BALANCED TRIAL. SETTING: THE TRIAL WAS CONDUCTED IN A UNIVERSITY EXERCISE PHYSIOLOGY LABORATORY. SUBJECTS: SUBJECTS INCLUDED 20 WOMEN AND MEN (29.15+/-6.98 YEARS OF AGE, WITH A RANGE OF 18-47 YEARS). INTERVENTIONS: PARTICIPANTS COMPLETED A YOGA PLUS RELAXATION (YR) SESSION AND A RELAXATION ONLY (R) SESSION. RESULTS: THE YR CONDITION PRODUCED SIGNIFICANT CHANGES FROM BASELINE IN HEART RATE (HR; BEATS PER MINUTE [BPM], P<0.001) AND INDICES OF HRV: R-R (MS, P<0.001), PNN50 (%, P=0.009), LOW FREQUENCY (LF; %, P=0.008) AND HIGH FREQUENCY (HF; %, P=0.035). THE R CONDITION PRODUCED SIGNIFICANT CHANGES FROM BASELINE IN HEART RATE (BPM, P<0.001) AS WELL AS INDICES OF HRV: R-R (MS, P<0.001), HF (MS(2), P=0.004), LF (%, P=0.005), HF (%, P=0.008) AND LF:HF RATIO (%, P=0.008). THERE WERE NO SIGNIFICANT DIFFERENCES BETWEEN CONDITIONS AT BASELINE NOR FOR THE CHANGES FROM BASELINE FOR ANY OF THE VARIABLES. CONCLUSIONS: THESE CHANGES DEMONSTRATE A FAVORABLE SHIFT IN AUTONOMIC BALANCE TO THE PARASYMPATHETIC BRANCH OF THE ANS FOR BOTH CONDITIONS, AND THAT YOGA NIDRA RELAXATION PRODUCES FAVORABLE CHANGES IN MEASURES OF HRV WHETHER ALONE OR PRECEDED BY A BOUT OF HATHA YOGA.	2012	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  
6 1530  37 IYENGAR YOGA INCREASES CARDIAC PARASYMPATHETIC NERVOUS MODULATION AMONG HEALTHY YOGA PRACTITIONERS. RELAXATION TECHNIQUES ARE ESTABLISHED IN MANAGING OF CARDIAC PATIENTS DURING REHABILITATION AIMING TO REDUCE FUTURE ADVERSE CARDIAC EVENTS. IT HAS BEEN HYPOTHESIZED THAT RELAXATION-TRAINING PROGRAMS MAY SIGNIFICANTLY IMPROVE CARDIAC AUTONOMIC NERVOUS TONE. HOWEVER, THIS HAS NOT BEEN PROVEN FOR ALL AVAILABLE RELAXATION TECHNIQUES. WE TESTED THIS ASSUMPTION BY INVESTIGATING CARDIAC VAGAL MODULATION DURING YOGA.WE EXAMINED 11 HEALTHY YOGA PRACTITIONERS (7 WOMEN AND 4 MEN, MEAN AGE: 43 +/- 11; RANGE: 26-58 YEARS). EACH INDIVIDUAL WAS SUBJECTED TO TRAINING UNITS OF 90 MIN ONCE A WEEK OVER FIVE SUCCESSIVE WEEKS. DURING TWO SESSIONS, THEY PRACTICED A YOGA PROGRAM DEVELOPED FOR CARDIAC PATIENTS BY B.K.S. IYENGAR. ON THREE SESSIONS, THEY PRACTICED A PLACEBO PROGRAM OF RELAXATION. ON EACH TRAINING DAY THEY UNDERWENT AMBULATORY 24 H HOLTER MONITORING. THE GROUP OF YOGA PRACTITIONERS WAS COMPARED TO A MATCHED GROUP OF HEALTHY INDIVIDUALS NOT PRACTICING ANY RELAXATION TECHNIQUES. PARAMETERS OF HEART RATE VARIABILITY (HRV) WERE DETERMINED HOURLY BY A BLINDED OBSERVER. MEAN RR INTERVAL (INTERVAL BETWEEN TWO R-WAVES OF THE ECG) WAS SIGNIFICANTLY HIGHER DURING THE TIME OF YOGA INTERVENTION COMPARED TO PLACEBO AND TO CONTROL (P < 0.001 FOR BOTH). THE INCREASE IN HRV PARAMETERS WAS SIGNIFICANTLY HIGHER DURING YOGA EXERCISE THAN DURING PLACEBO AND CONTROL ESPECIALLY FOR THE PARAMETERS ASSOCIATED WITH VAGAL TONE, I.E. MEAN STANDARD DEVIATION OF NN (NORMAL BEAT TO NORMAL BEAT OF THE ECG) INTERVALS FOR ALL 5-MIN INTERVALS (SDNNI, P < 0.001 FOR BOTH) AND ROOT MEAN SQUARE SUCCESSIVE DIFFERENCE (RMSSD, P < 0.01 FOR BOTH). IN CONCLUSION, RELAXATION BY YOGA TRAINING IS ASSOCIATED WITH A SIGNIFICANT INCREASE OF CARDIAC VAGAL MODULATION. SINCE THIS METHOD IS EASY TO APPLY WITH NO SIDE EFFECTS, IT COULD BE A SUITABLE INTERVENTION IN CARDIAC REHABILITATION PROGRAMS.	2007	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
7 1062  42 EFFECTS OF YOGA ON HEART RATE VARIABILITY AND DEPRESSIVE SYMPTOMS IN WOMEN: A RANDOMIZED CONTROLLED TRIAL. OBJECTIVES: THE PURPOSE OF THE STUDY WAS TO INVESTIGATE THE EFFECTS OF A 12-WEEK YOGA PROGRAM ON HEART RATE VARIABILITY (HRV) AND DEPRESSIVE SYMPTOMS IN DEPRESSED WOMEN. METHODS: THIS WAS A RANDOMIZED CONTROLLED TRIAL. TWENTY-SIX SEDENTARY WOMEN SCORING >/=14 ON THE BECK DEPRESSION INVENTORY-II WERE RANDOMIZED TO EITHER THE YOGA OR THE CONTROL GROUP. THE YOGA GROUP COMPLETED A 12-WEEK YOGA PROGRAM, WHICH TOOK PLACE TWICE A WEEK FOR 60 MIN PER SESSION AND CONSISTED OF BREATHING EXERCISES, YOGA POSE PRACTICE, AND SUPINE MEDITATION/RELAXATION. THE CONTROL GROUP WAS INSTRUCTED NOT TO ENGAGE IN ANY YOGA PRACTICE AND TO MAINTAIN THEIR USUAL LEVEL OF PHYSICAL ACTIVITY DURING THE COURSE OF THE STUDY. PARTICIPANTS' HRV, DEPRESSIVE SYMPTOMS, AND PERCEIVED STRESS WERE ASSESSED AT BASELINE AND POST-TEST. RESULTS: THE YOGA GROUP HAD A SIGNIFICANT INCREASE IN HIGH-FREQUENCY HRV AND DECREASES IN LOW-FREQUENCY HRV AND LOW FREQUENCY/HIGH FREQUENCY RATIO AFTER THE INTERVENTION. THE YOGA GROUP ALSO REPORTED SIGNIFICANTLY REDUCED DEPRESSIVE SYMPTOMS AND PERCEIVED STRESS. NO CHANGE WAS FOUND IN THE CONTROL GROUP. CONCLUSIONS: A 12-WEEK YOGA PROGRAM WAS EFFECTIVE IN INCREASING PARASYMPATHETIC TONE AND REDUCING DEPRESSIVE SYMPTOMS AND PERCEIVED STRESS IN WOMEN WITH ELEVATED DEPRESSIVE SYMPTOMS. REGULAR YOGA PRACTICE MAY BE RECOMMENDED FOR WOMEN TO COPE WITH THEIR DEPRESSIVE SYMPTOMS AND STRESS AND TO IMPROVE THEIR HRV.	2017	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             
8  306  32 AN EVALUATION OF THE ABILITY TO VOLUNTARILY REDUCE THE HEART RATE AFTER A MONTH OF YOGA PRACTICE. THE STUDY AIMED AT DETERMINING WHETHER NOVICES TO YOGA WOULD BE ABLE TO REDUCE THEIR HEART RATE VOLUNTARILY AND WHETHER THE MAGNITUDE OF REDUCTION WOULD BE MORE AFTER 30 DAYS OF YOGA TRAINING. TWO GROUPS (YOGA AND CONTROL, N = 12 EACH) WERE ASSESSED ON DAY 1 AND ON DAY 30. DURING THE INTERVENING 30 DAYS, THE YOGA GROUP RECEIVED TRAINING IN YOGA TECHNIQUES WHILE THE CONTROL GROUP CARRIED ON WITH THEIR ROUTINE. AT EACH ASSESSMENT THE BASELINE HEART RATE WAS RECORDED FOR ONE MINUTE, THIS WAS FOLLOWED BY A SIX-MINUTE PERIOD DURING WHICH PARTICIPANTS WERE ASKED TO ATTEMPT TO VOLUNTARILY REDUCE THEIR HEART RATE, USING ANY STRATEGY. BOTH THE BASELINE HEART RATE AND THE LOWEST HEART RATE ACHIEVED VOLUNTARILY DURING THE SIX-MINUTE PERIOD WERE SIGNIFICANTLY LOWER IN THE YOGA GROUP ON DAY 30 COMPARED TO DAY 1 BY A GROUP AVERAGE OF 10.7 BEATS PER MINUTE (I.E., BPM) AND 6.8 BPM, RESPECTIVELY (P < .05, WILCOXON PAIRED SIGNED RANKS TEST). IN CONTRAST, THERE WAS NO SIGNIFICANT CHANGE IN EITHER THE BASELINE HEART RATE OR THE LOWEST HEART RATE ACHIEVED VOLUNTARILY IN THE CONTROL GROUP ON DAY 30 COMPARED TO DAY 1. THE RESULTS SUGGEST THAT YOGA TRAINING CAN ENABLE PRACTITIONERS TO USE THEIR OWN STRATEGIES TO REDUCE THE HEART RATE, WHICH HAS POSSIBLE THERAPEUTIC APPLICATIONS.	2004	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
9 1027  37 EFFECTS OF YOGA BREATHING PRACTICE ON HEART RATE VARIABILITY IN HEALTHY ADOLESCENTS: A RANDOMIZED CONTROLLED TRIAL. BACKGROUND: THIS STUDY WAS CONDUCTED AMONG HEALTHY ADOLESCENTS TO ASSESS THE EFFECTS OF A YOGA BREATHING PRACTICE (BHRAMARI PRANAYAMA, BHR.P) TOWARDS CARDIAC AUTONOMIC FUNCTION USING HEART RATE VARIABILITY (HRV) PARAMETERS. METHODS: OF THE 730 ELIGIBLE SUBJECTS SCREENED, 520 HEALTHY ADOLESCENTS WHO MET THE INCLUSION AND EXCLUSION CRITERIA WERE RANDOMLY ASSIGNED TO EITHER YOGA BREATHING GROUP (N=260) OR CONTROL GROUP (N=260). THE YOGA BREATHING GROUP PRACTICED BHR.P. FIVE DAYS A WEEK FOR A DURATION OF SIX MONTHS WHILE THE CONTROL GROUP CONTINUED WITH THEIR DAILY ROUTINE WITHOUT ANY INTERVENTION. OUTCOME MEASURES WERE TIME AND FREQUENCY DOMAIN OF HRV IN BOTH GROUPS WHICH WERE ASSESSED BEFORE AND AFTER THE INTERVENTION USING LEAD II ECG. LINEAR MODELS WERE USED IN THE ANALYSIS OF SHORT TERM HRV. RESULTS: AFTER 6 MONTHS OF YOGA BREATHING, THE TIME DOMAIN PARAMETERS OF SHORT TERM HRV SHOWED SIGNIFICANT (P<0.05) IMPROVEMENT TOWARDS THE PARASYMPATHETIC DOMAIN. FREQUENCY DOMAIN PARAMETERS ALSO SHOWED THE SAME DIRECTION OF CHANGES. IN CONTRAST, CONTROL GROUP SUBJECTS SHOWED A TREND TOWARDS A SYMPATHETIC DOMAIN. CONCLUSION: THE PRESENT STUDY SHOWED A POSITIVE SHIFT IN CARDIAC AUTONOMIC MODULATION TOWARDS PARASYMPATHETIC PREDOMINANCE AFTER 6 MONTHS OF YOGA BREATHING PRACTICE AMONG APPARENTLY HEALTHY ADOLESCENTS.	2020	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
10  427  41 CAN YOGA BOOST ACCESS TO THE BODILY AND EMOTIONAL SELF? CHANGES IN HEART RATE VARIABILITY AND IN AFFECTIVE EVALUATION BEFORE, DURING AND AFTER A SINGLE SESSION OF YOGA EXERCISE WITH AND WITHOUT INSTRUCTIONS OF CONTROLLED BREATHING AND MINDFUL BODY AWARENESS IN YOUNG HEALTHY WOMEN. EXERCISE IS INDISPENSABLE FOR A HEALTHY LIFESTYLE. YOGA EXERCISE CAN HAVE POSITIVE EFFECTS ON WELL-BEING AND ON CARDIAC AUTONOMIC ACTIVITY MAKING IT AN IDEAL INTERVENTION FOR IMPROVING MIND-BODY INTERACTIONS AND RESILIENCE TO PHYSICAL AND MENTAL STRESSORS. EMOTIONS TRIGGER ESPECIALLY STRONG BODILY AND AFFECTIVE-COGNITIVE RESPONSES BECAUSE OF THEIR SOCIAL RELEVANCE FOR THE SELF AND THEIR BIOLOGICAL RELEVANCE OF MOBILIZING THE ORGANISM FOR ACTION. THIS STUDY INVESTIGATES WHETHER CHANGES IN EMOTION PROCESSING RELATED TO SELF-OTHER REFERENTIAL PROCESSING AND CHANGES IN CARDIAC AUTONOMIC ACTIVITY, REFLECTED BY HEART RATE VARIABILITY (HRV), OCCUR IMMEDIATELY AFTER ALREADY A SINGLE SESSION OF YOGA EXERCISE WHEN YOGA POSTURES ARE PRACTICED WITH OR WITHOUT BREATHING- AND MINDFUL BODY AWARENESS INSTRUCTIONS. WOMEN, ALL UNIVERSITY STUDENTS (N = 34, FINAL SAMPLE: N = 30, N = 25 NAIVE TO YOGA PRACTICE) WERE RANDOMLY ASSIGNED TO TWO EXPERIMENTAL GROUPS WHO PERFORMED THE SAME YOGA EXERCISES WITH OR WITHOUT CONTROLLED BREATHING AND MINDFULNESS INSTRUCTIONS. EMOTIONAL, SELF-OTHER REFERENTIAL PROCESSING, AWARENESS OF BODILY SIGNALS AND HRV INDICATORS WERE INVESTIGATED BEFORE AND AFTER THE EXERCISE USING STANDARDIZED EXPERIMENTAL TASKS, STANDARDIZED QUESTIONNAIRES, AND MOBILE RECORDING DEVICES. EXERCISING FOR 30 MINUTES CHANGED CARDIAC ACTIVITY SIGNIFICANTLY. HRV MEASURES SHOWED ADAPTABILITY OF CARDIAC ACTIVITY DURING THE EXERCISE AS WELL AS DURING THE AFFECTIVE TASK POST- TO PRE-EXERCISE. EXERCISING WITH BREATHING INSTRUCTIONS AND MINDFUL BODY AWARENESS HAD NO SUPERIOR EFFECTS ON CARDIAC, PARTICULARLY PARASYMPATHETIC ACTIVITY, COMPARED TO PRACTICING THE SAME MOVEMENTS WITHOUT SUCH EXPLICIT INSTRUCTIONS. SELF-REFERENTIAL PROCESSING DID NOT CHANGE; HOWEVER, PARTICIPANTS WERE FASTER AND MORE ACCURATE IN THEIR AFFECTIVE JUDGMENTS OF EMOTIONAL STIMULI [REGARDLESS OF THEIR REFERENCE (SELF/OTHER)], AND SHOWED BETTER AWARENESS OF BODILY SIGNALS AFTER COMPARED TO BEFORE THE EXERCISE SESSION. THE RESULTS SUPPORT IMMEDIATE, ADAPTIVE EFFECTS OF YOGA EXERCISE ON CARDIAC AND AFFECTIVE-COGNITIVE PROCESSING IN AN ALL-FEMALE HEALTHY SAMPLE. THEREFORE, YOGA EXERCISE COULD BE RECOMMENDED AS A PHYSICAL ACTIVITY FOR BOOSTING CARDIAC AND EMOTIONAL RESILIENCE IN THIS TARGET GROUP.	2021	

11 2409  39 YOGA AND HEART RATE VARIABILITY: A COMPREHENSIVE REVIEW OF THE LITERATURE. HEART RATE VARIABILITY (HRV) HAS BEEN USED AS A PROXY FOR HEALTH AND FITNESS AND INDICATOR OF AUTONOMIC REGULATION AND THEREFORE, APPEARS WELL PLACED TO ASSESS THE CHANGES OCCURRING WITH MIND.-BODY PRACTICES THAT FACILITATE AUTONOMIC BALANCE. WHILE MANY STUDIES SUGGEST THAT YOGA INFLUENCES HRV, SUCH STUDIES HAVE NOT BEEN SYSTEMATICALLY REVIEWED. WE AIMED TO SYSTEMATICALLY REVIEW ALL PUBLISHED PAPERS THAT REPORT ON YOGA PRACTICES AND HRV. A COMPREHENSIVE SEARCH OF MULTIPLE DATABASES WAS CONDUCTED AND ALL STUDIES THAT REPORTED A MEASURE OF HRV ASSOCIATED WITH ANY YOGA PRACTICE WERE INCLUDED. STUDIES WERE CATEGORIZED BY THE STUDY DESIGN AND TYPE OF YOGA PRACTICE. A TOTAL OF 59 STUDIES WERE REVIEWED INVOLVING A TOTAL OF 2358 PARTICIPANTS. MOST STUDIES WERE PERFORMED IN INDIA ON RELATIVELY SMALL NUMBERS OF HEALTHY MALE YOGA PRACTITIONERS DURING A SINGLE LABORATORY SESSION. OF THE REVIEWED STUDIES, 15 WERE RANDOMIZED CONTROLLED TRIALS WITH 6 HAVING A JADAD SCORE OF 3. THE REVIEWED STUDIES SUGGEST THAT YOGA CAN AFFECT CARDIAC AUTONOMIC REGULATION WITH INCREASED HRV AND VAGAL DOMINANCE DURING YOGA PRACTICES. REGULAR YOGA PRACTITIONERS WERE ALSO FOUND TO HAVE INCREASED VAGAL TONE AT REST COMPARED TO NON-YOGA PRACTITIONERS. IT IS PREMATURE TO DRAW ANY FIRM CONCLUSIONS ABOUT YOGA AND HRV AS MOST STUDIES WERE OF POOR QUALITY, WITH SMALL SAMPLE SIZES AND INSUFFICIENT REPORTING OF STUDY DESIGN AND STATISTICAL METHODS. RIGOROUS STUDIES WITH DETAILED REPORTING OF YOGA PRACTICES AND ANY CORRESPONDING CHANGES IN RESPIRATION ARE REQUIRED TO DETERMINE THE EFFECT OF YOGA ON HRV.	2016	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       
12  650  40 DYNAMICS OF HEART RATE VARIABILITY UNDER THE INFLUENCE OF COURSE YOGA BREATHING EXERCISES ON HEALTHY YOUNG PEOPLE. OBJECTIVE: INTRODUCTION: HEART RATE VARIABILITY IS A HIGHLY INFORMATIVE NON-INVASIVE METHOD OF RESEARCH NOT ONLY FOR THE FUNCTIONAL STATE OF THE CARDIOVASCULAR SYSTEM AND ALSO FOR THE INTEGRATIVE REGULATORY ACTIVITY OF THE AUTONOMIC NERVOUS SYSTEM. THE POSITIVE EFFECT OF DIAPHRAGMATIC BREATHING IS POSITIVE IN THE MODE OF BIOLOGICAL FEEDBACK USING PORTABLE DEVICES, BUT THERE IS LITTLE EVIDENCE OF THE USE OF YOGA BREATHING GYMNASTICS IN ORDER TO INFLUENCE THE HEART RATE VARIABILITY. THE AIM: TO COMPARE THE POSSIBILITIES OF USING COURSES OF BREATHING GYMNASTICS OF YOGIS AND DIAPHRAGMATIC BREATHING SESSIONS IN THE MODE OF BIOLOGICAL FEEDBACK USING A PORTABLE DEVICE. PATIENTS AND METHODS: MATERIALS AND METHODS: THE STUDY INVOLVED 70 PRACTICALLY HEALTHY FOREIGNERS, WHO WERE DIVIDED INTO 2 GROUPS OF 35 PEOPLE. PARTICIPANTS OF THE 1ST GROUP DAILY ENGAGE IN RESPIRATORY EXERCISES PRANAYAMA FOR 15 MINUTES IN 1 MONTH. PARTICIPANTS IN THE 2ND GROUP USED THE MYCALMBEAT PORTABLE DEVICE. HEART RATE VARIABILITY WAS REGISTERED BY USING THE COMPUTER DIAGNOSTIC COMPLEX "CARDIOLAB" ("KHAI-MEDIKA", UKRAINE). RESULTS: RESULTS: IN BOTH GROUPS THERE WAS SIMILAR DYNAMICS OF HEART RATE VARIABILITY INDICES, BUT ITS SEVERITY WAS DIFFERENT. THE COMMON INTEGRAL EFFECT WAS A SIGNIFICANT GROWTH OF HEART RATE VARIABILITY BOTH ACCORDING TO STATISTICAL AND SPECTRAL INDICATORS - TOTAL POWER INCREASED, AS WELL AS HIGH-FREQUENCY COMPONENT. THE POWER OF THE VERY-LOW FREQUENCY WAVES HAS PROBABLY DECREASED ONLY IN THE GROUP WITH THE DEVICE. IN THE PERCENTAGE STRUCTURE OF THE CARDIAC RHYTHM SPECTRUM, THE SPECIFIC WEIGHT OF VERY-LOW FREQUENCY COMPONENT AND THE PERCENTAGE OF HIGH-FREQUENCY COMPONENT INCREASED. CONCLUSION: CONCLUSIONS: RESPIRATORY GYMNASTICS YOGA FOR 15 MINUTES DAILY CONTRIBUTES TO THE GROWTH OF HEART RATE VARIABILITY THROUGH THE SUPPRESSION OF THE CENTRAL LINK (VERY-LOW FREQUENCY COMPONENT) OF REGULATION OF CARDIAC RHYTHM AND INCREASED ACTIVITY OF PARASYMPATHETIC INFLUENCES (HIGH-FREQUENCY COMPONENT), AS WELL AS THE REDISTRIBUTION OF REGULATORY ACTIVITY OF THE CENTRAL NERVOUS SYSTEM BETWEEN THE CENTRAL AND PERIPHERAL LINKS OF REGULATION OF THE CARDIAC RHYTHM IN FAVOR OF THE LATTER.	2019	
                                                                                                                                                                                                                                                               
13 1063  35 EFFECTS OF YOGA ON HEART RATE VARIABILITY AND MOOD IN WOMEN: A RANDOMIZED CONTROLLED TRIAL. OBJECTIVE: TO EXAMINE THE EFFECTS OF AN 8-WEEK YOGA PROGRAM ON HEART RATE VARIABILITY AND MOOD IN GENERALLY HEALTHY WOMEN. DESIGN: RANDOMIZED CONTROLLED TRIAL. PARTICIPANTS: FIFTY-TWO HEALTHY WOMEN WERE RANDOMLY ASSIGNED TO A YOGA GROUP OR A CONTROL GROUP. INTERVENTIONS: PARTICIPANTS IN THE YOGA GROUP COMPLETED AN 8-WEEK YOGA PROGRAM, WHICH COMPRISED A 60-MINUTE SESSION TWICE A WEEK. EACH SESSION CONSISTED OF BREATHING EXERCISES, YOGA POSE PRACTICE, AND SUPINE MEDITATION/RELAXATION. THE CONTROL GROUP WAS INSTRUCTED NOT TO ENGAGE IN ANY YOGA PRACTICE AND TO MAINTAIN THEIR USUAL LEVEL OF PHYSICAL ACTIVITY DURING THE STUDY. OUTCOME MEASURES: PARTICIPANTS' HEART RATE VARIABILITY, PERCEIVED STRESS, DEPRESSIVE SYMPTOMS, AND STATE AND TRAIT ANXIETY WERE ASSESSED AT BASELINE (WEEK 0) AND AFTER THE INTERVENTION (WEEK 9). RESULTS: NO MEASURES OF HEART RATE VARIABILITY CHANGED SIGNIFICANTLY IN EITHER THE YOGA OR CONTROL GROUP AFTER INTERVENTION. STATE ANXIETY WAS REDUCED SIGNIFICANTLY IN THE YOGA GROUP BUT NOT IN THE CONTROL GROUP. NO SIGNIFICANT CHANGES WERE NOTED IN PERCEIVED STRESS, DEPRESSION, OR TRAIT ANXIETY IN EITHER GROUP. CONCLUSIONS: AN 8-WEEK YOGA PROGRAM WAS NOT SUFFICIENT TO IMPROVE HEART RATE VARIABILITY. HOWEVER, SUCH A PROGRAM APPEARS TO BE EFFECTIVE IN REDUCING STATE ANXIETY IN GENERALLY HEALTHY WOMEN. FUTURE RESEARCH SHOULD INVOLVE LONGER PERIODS OF YOGA TRAINING, INCLUDE HEART RATE VARIABILITY MEASURES BOTH AT REST AND DURING YOGA PRACTICE, AND ENROLL WOMEN WITH HIGHER LEVELS OF STRESS AND TRAIT ANXIETY.	2015	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     
14 2364  38 VOLUNTARY HEART RATE REDUCTION FOLLOWING YOGA USING DIFFERENT STRATEGIES. BACKGROUND/AIMS: ONE MONTH OF YOGA TRAINING HAS BEEN SHOWN TO REDUCE THE PULSE RATE VOLUNTARILY WITHOUT USING EXTERNAL CUES. HENCE, THE PRESENT STUDY WAS DESIGNED TO UNDERSTAND THE STRATEGIES USED BY YOGA PRACTITIONERS AND AUTONOMIC CHANGES ASSOCIATED WITH VOLUNTARY HEART RATE REDUCTION. MATERIALS AND METHODS: FIFTY VOLUNTEERS (GROUP MEAN AGE +/- S.D., 25.4 +/- 4.8 YEARS; 25 MALES) WERE ASSESSED IN TWO TRIALS ON SEPARATE DAYS. EACH TRIAL WAS FOR 12 MINUTES, WITH A 'PRE' STATE AND 'DURING' STATE OF 6 MINUTES EACH. FOR BOTH TRIALS THE 'PRE' STATE WAS RELAXATION WITH EYES CLOSED. IN THE 'DURING' STATE OF TRIAL I, SUBJECTS WERE ASKED TO VOLUNTARILY REDUCE THEIR HEART RATE USING A STRATEGY OF THEIR CHOICE. FROM THEIR RESPONSES TO SPECIFIC QUESTIONS IT WAS DETERMINED THAT 22 OUT OF 50 PERSONS USED BREATH REGULATION AS A STRATEGY. HENCE, IN THE 'DURING' STATE OF TRIAL II, SUBJECTS WERE ASKED TO VOLUNTARILY REDUCE THEIR HEART RATE BY BREATH REGULATION. RESULTS: IN THE FIRST TRIAL, THE HEART RATE WAS REDUCED BY AN AVERAGE OF 19.6 BEATS PER MINUTE AND IN THE SECOND TRIAL (WITH BREATH REGULATION EXCLUSIVELY) AN AVERAGE DECREASE OF 22.2 BEATS PER MINUTE WAS ACHIEVED. CONCLUSIONS: HENCE, THE STRATEGY USED DID NOT MARKEDLY ALTER THE OUTCOME.	2013	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                         
15  845  37 EFFECT OF YOGA ON PULSE RATE AND BLOOD PRESSURE AMONG WOMEN. OBJECTIVES: CHANGE IN THE PAST FEW DECADES IN HUMAN LIFE STYLE, NOWADAYS INTERNATIONAL HEALTH ORGANIZATIONS, I.E., WORLD HEALTH ORGANIZATION ARE ALSO FOCUSING ON PREVENTION ALONG WITH TREATMENT ASPECT OF CHRONIC ILLNESS. RESEARCHES FOCUS THAT WOMEN OF AGE GROUP 30-45 YEARS ARE AT INCREASED RISK FOR HYPERTENSION AND HEART DISEASE DUE TO INCREASED WEIGHT. YOGA IS AN EFFECTIVE METHOD TO CONTROL OUR PHYSIOLOGICAL VARIABLES LIKE BLOOD PRESSURE (BP), PULSE, ETC. THE MAIN AIM OF THIS STUDY WAS TO IDENTIFY THE EFFECTS OF YOGA ON PHYSIOLOGICAL VARIABLES. METHODS: THE STUDY WAS AN EXPERIMENTAL STUDY WITH TWO GROUP, PRETEST AND POSTTEST CONTROL GROUP, DESIGN, WHICH WAS CONDUCTED ON 40 FEMALE PARTICIPANTS. PRANAYAMA AND MEDITATION FOR A PERIOD OF 6 WEEKS WAS DONE BY THESE WOMEN. RESULTS: YOGA THERAPY SIGNIFICANTLY REDUCED THE BP (0.000*) AND PULSE RATE (0.000*) OF WOMEN, WHICH WAS ALSO STATISTICALLY PROVED. CONCLUSIONS: YOGA THERAPY CAN BE AN EFFECTIVE METHOD TO CONTROL BP AND PULSE RATE OF PATIENTS WITH CHRONIC DISEASES.	2021	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                    
16 2680  49 YOGA IN SCHOOL SPORTS IMPROVES FUNCTIONING OF AUTONOMIC NERVOUS SYSTEM IN YOUNG ADULTS: A NON-RANDOMIZED CONTROLLED PILOT STUDY. BACKGROUND: YOGA IN SCHOOL IS A BENEFICIAL TOOL TO PROMOTE THE GOOD HEALTH AND WELL-BEING OF STUDENTS BY CHANGING THE WAY THEY REACT TO STRESS. THE POSITIVE EFFECTS OF YOGA-TAUGHT IN SCHOOLS-ON CHILDREN, YOUTH AND YOUNG ADULTS HAVE BEEN DEMONSTRATED IN FORMER STUDIES USING MOSTLY SUBJECTIVE PSYCHOMETRIC DATA. AIM: THE PRESENT TRIAL AIMS TO EVALUATE THE POTENTIAL EFFECTS OF YOGA ON AUTONOMIC REGULATION IN YOUNG ADULTS BY ANALYZING HEART RATE VARIABILITY (HRV). METHODS: THIS STUDY IS A NON-RANDOMIZED, EXPLORATIVE, TWO-ARM-PILOT STUDY WITH AN ACTIVE CONTROL GROUP. FOURTEEN HEALTHY YOUNG ADULTS TOOK PART IN A 10-WEEK YOGA PROGRAM (90 MIN ONCE A WEEK) IN SCHOOL AND WERE COMPARED TO A CONTROL GROUP OF 11 STUDENTS WHO PARTICIPATED IN CONVENTIONAL SCHOOL SPORTS (90 MIN ONCE A WEEK OVER 10 WEEKS). 24-HOUR ELECTROCARDIOGRAMS (ECGS) WERE RECORDED AT BASELINE AND FOLLOWING THE 10-WEEK INTERVENTION. FROM 20-MINUTE OF NOCTURNAL SLEEP PHASES, HRV PARAMETERS WERE CALCULATED FROM LINEAR (TIME AND FREQUENCY DOMAIN) AND NONLINEAR DYNAMICS (SUCH AS SYMBOLIC DYNAMICS AND POINCARE PLOT ANALYSIS). ANALYSES OF VARIANCE (ANOVA) FOLLOWED BY T-TESTS AS POST-HOC TESTS ESTIMATING BOTH STATISTICAL SIGNIFICANCE AND EFFECT SIZE WERE USED TO COMPARE PRE-POST-INTERVENTION FOR THE TWO GROUPS. RESULTS: THE STATISTICAL ANALYSIS OF THE INTERACTION EFFECTS DID NOT REVEAL A SIGNIFICANT GROUP AND TIME INTERACTION FOR THE INDIVIDUAL NOCTURNAL HRV INDICES. ALMOST ALL INDICES REVEALED MEDIUM AND LARGE EFFECTS REGARDING THE TIME MAIN EFFECTS. THE CHANGES IN THE HRV INDICES FOLLOWING THE INTERVENTION WERE MORE DRAMATIC FOR THE YOGA GROUP THAN FOR THE CONTROL GROUP WHICH IS REFLECTED IN PREDOMINANTLY HIGHER SIGNIFICANCES AND STRONGER EFFECT SIZES IN THE YOGA GROUP. CONCLUSION: IN THIS EXPLORATIVE PILOT TRIAL, AN INCREASE OF HRV (MORE PARASYMPATHETIC DOMINANCE AND OVERALL HIGHER HRV) AFTER TEN WEEKS OF YOGA IN SCHOOL IN COMPARISON TO REGULAR SCHOOL SPORTS WAS DEMONSTRATED, SHOWING AN IMPROVED SELF-REGULATION OF THE AUTONOMIC NERVOUS SYSTEM.	2020	
                                                                                                                                                                                                                                                                                                                                                                                                                     
17 1258  28 FIFTEEN MINUTES OF CHAIR-BASED YOGA POSTURES OR GUIDED MEDITATION PERFORMED IN THE OFFICE CAN ELICIT A RELAXATION RESPONSE. THIS STUDY COMPARED ACUTE (15 MIN) YOGA POSTURE AND GUIDED MEDITATION PRACTICE, PERFORMED SEATED IN A TYPICAL OFFICE WORKSPACE, ON PHYSIOLOGICAL AND PSYCHOLOGICAL MARKERS OF STRESS. TWENTY PARTICIPANTS (39.6 +/- 9.5 YR) COMPLETED THREE CONDITIONS: YOGA, MEDITATION, AND CONTROL (I.E., USUAL WORK) SEPARATED BY >/=24 HRS. YOGA AND MEDITATION SIGNIFICANTLY REDUCED PERCEIVED STRESS VERSUS CONTROL, AND THIS EFFECT WAS MAINTAINED POSTINTERVENTION. YOGA INCREASED HEART RATE WHILE MEDITATION REDUCED HEART RATE VERSUS CONTROL (P < 0.05). RESPIRATION RATE WAS REDUCED DURING YOGA AND MEDITATION VERSUS CONTROL (P < 0.05). DOMAINS OF HEART RATE VARIABILITY (E.G., SDNN AND TOTAL POWER) WERE SIGNIFICANTLY REDUCED DURING CONTROL VERSUS YOGA AND MEDITATION. SYSTOLIC AND DIASTOLIC BLOOD PRESSURE WERE REDUCED SECONDARY TO MEDITATION VERSUS CONTROL ONLY (P < 0.05). PHYSIOLOGICAL ADAPTATIONS GENERALLY REGRESSED TOWARD BASELINE POSTINTERVENTION. IN CONCLUSION, YOGA POSTURES OR MEDITATION PERFORMED IN THE OFFICE CAN ACUTELY IMPROVE SEVERAL PHYSIOLOGICAL AND PSYCHOLOGICAL MARKERS OF STRESS. THESE EFFECTS MAY BE AT LEAST PARTIALLY MEDIATED BY REDUCED RESPIRATION RATE.	2012	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                              
18  448  45 CHANGES IN AUTONOMIC VARIABLES FOLLOWING TWO MEDITATIVE STATES DESCRIBED IN YOGA TEXTS. OBJECTIVES: IN ANCIENT YOGA TEXTS THERE ARE TWO MEDITATIVE STATES DESCRIBED. ONE IS DHARANA, WHICH REQUIRES FOCUSING, THE SECOND IS DHYANA, DURING WHICH THERE IS NO FOCUSING, BUT AN EXPANSIVE MENTAL STATE IS REACHED. WHILE AN EARLIER STUDY DID SHOW IMPROVED PERFORMANCE IN AN ATTENTION TASK AFTER DHARANA, THE AUTONOMIC CHANGES DURING THESE TWO STATES HAVE NOT BEEN STUDIED. METHODS: AUTONOMIC AND RESPIRATORY VARIABLES WERE ASSESSED IN 30 HEALTHY MALE VOLUNTEERS (GROUP MEAN AGE +/- SD, 29.1 +/- 5.1 YEARS) DURING FOUR MENTAL STATES DESCRIBED IN TRADITIONAL YOGA TEXTS. THESE FOUR MENTAL STATES ARE RANDOM THINKING (CANCALATA), NONMEDITATIVE FOCUSING (EKAGRATA), MEDITATIVE FOCUSING (DHARANA), AND EFFORTLESS MEDITATION (DHYANA). ASSESSMENTS WERE MADE BEFORE (5 MINUTES), DURING (20 MINUTES), AND AFTER (5 MINUTES), EACH OF THE FOUR STATES, ON FOUR SEPARATE DAYS. RESULTS: DURING DHYANA THERE WAS A SIGNIFICANT INCREASE IN THE SKIN RESISTANCE LEVEL (P<0.001; POST HOC ANALYSIS FOLLOWING ANOVA, DURING COMPARED TO PRE) AND PHOTO-PLETHYSMOGRAM AMPLITUDE (P<0.05), WHEREAS THERE WAS A SIGNIFICANT DECREASE IN THE HEART RATE (P<0.001) AND BREATH RATE (P<0.001). THERE WAS A SIGNIFICANT DECREASE IN THE LOW FREQUENCY (LF) POWER (P<0.001) AND INCREASE IN THE HIGH FREQUENCY (HF) POWER (P<0.001) IN THE FREQUENCY DOMAIN ANALYSIS OF THE HEART RATE VARIABILITY (HRV) SPECTRUM, ON WHICH HF POWER IS ASSOCIATED WITH PARASYMPATHETIC ACTIVITY. THERE WAS ALSO A SIGNIFICANT INCREASE IN THE NN50 COUNT (THE NUMBER OF INTERVAL DIFFERENCES OF SUCCESSIVE NN INTERVALS GREATER THAN 50 MS; P<0.001) AND THE PNN50 (THE PROPORTION DERIVED BY DIVIDING NN50 BY THE TOTAL NUMBER OF NN INTERVALS; P<0.001) IN TIME DOMAIN ANALYSIS OF HRV, BOTH INDICATIVE OF PARASYMPATHETIC ACTIVITY. CONCLUSIONS: MAXIMUM CHANGES WERE SEEN IN AUTONOMIC VARIABLES AND BREATH RATE DURING THE STATE OF EFFORTLESS MEDITATION (DHYANA). THE CHANGES WERE ALL SUGGESTIVE OF REDUCED SYMPATHETIC ACTIVITY AND/OR INCREASED VAGAL MODULATION. DURING DHARANA THERE WAS AN INCREASE IN SKIN RESISTANCE. THE CHANGES IN HRV DURING EKAGRATA AND CANCALATA WERE INCONCLUSIVE.	2013	
                                                                                                                                                                                                                                                                                                                                                                           
19  715  32 EFFECT OF INTEGRATED YOGA ON STRESS AND HEART RATE VARIABILITY IN PREGNANT WOMEN. OBJECTIVE: TO STUDY THE EFFECT OF INTEGRATED YOGA PRACTICE AND GUIDED YOGIC RELAXATION ON BOTH PERCEIVED STRESS AND MEASURED AUTONOMIC RESPONSE IN HEALTHY PREGNANT WOMEN. METHOD: THE 122 HEALTHY WOMEN RECRUITED BETWEEN THE 18TH AND 20TH WEEK OF PREGNANCY AT PRENATAL CLINICS IN BANGALORE, INDIA, WERE RANDOMIZED TO PRACTICING YOGA AND DEEP RELAXATION OR STANDARD PRENATAL EXERCISES 1-HOUR DAILY. THE RESULTS FOR THE 45 PARTICIPANTS PER GROUP WHO COMPLETED THE STUDY WERE EVALUATED BY REPEATED MEASURES ANALYSIS OF VARIANCE. RESULTS: PERCEIVED STRESS DECREASED BY 31.57% IN THE YOGA GROUP AND INCREASED BY 6.60% IN THE CONTROL GROUP (P=0.001). DURING A GUIDED RELAXATION PERIOD IN THE YOGA GROUP, COMPARED WITH VALUES OBTAINED BEFORE A PRACTICE SESSION, THE HIGH-FREQUENCY BAND OF THE HEART RATE VARIABILITY SPECTRUM (PARASYMPATHETIC) INCREASED BY 64% IN THE 20TH WEEK AND BY 150% IN THE 36TH WEEK, AND BOTH THE LOW-FREQUENCY BAND (SYMPATHETIC), AND THE LOW-FREQUENCY TO HIGH-FREQUENCY RATIO WERE CONCOMITANTLY REDUCED (P<0.001 BETWEEN THE 2 GROUPS). MOREOVER, THE LOW-FREQUENCY BAND REMAINED DECREASED AFTER DEEP RELAXATION IN THE 36TH WEEK IN THE YOGA GROUP. CONCLUSION: YOGA REDUCES PERCEIVED STRESS AND IMPROVES ADAPTIVE AUTONOMIC RESPONSE TO STRESS IN HEALTHY PREGNANT WOMEN.	2009	
                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                 
20  716  35 EFFECT OF INTEGRATED YOGA PRACTICES ON IMMUNE RESPONSES IN EXAMINATION STRESS - A PRELIMINARY STUDY. BACKGROUND: STRESS IS OFTEN ASSOCIATED WITH AN INCREASED OCCURRENCE OF AUTONOMIC, CARDIOVASCULAR, AND IMMUNE SYSTEM PATHOLOGY. THIS STUDY WAS DONE TO EVALUATE THE IMPACT OF STRESS ON PSYCHOLOGICAL, PHYSIOLOGICAL PARAMETERS, AND IMMUNE SYSTEM DURING MEDICAL TERM -ACADEMIC EXAMINATION AND THE EFFECT OF YOGA PRACTICES ON THE SAME. MATERIALS AND METHODS: THE STUDY WAS CARRIED OUT ON SIXTY FIRST-YEAR MBBS STUDENTS RANDOMLY ASSIGNED TO YOGA GROUP AND CONTROL GROUP (30 EACH). THE YOGA GROUP UNDERWENT INTEGRATED YOGA PRACTICES FOR 35 MINUTES DAILY IN THE PRESENCE OF TRAINED YOGA TEACHER FOR 12 WEEKS. CONTROL GROUP DID NOT UNDERGO ANY KIND OF YOGA PRACTICE OR STRESS MANAGEMENT. PHYSIOLOGICAL PARAMETERS LIKE HEART RATE, RESPIRATORY RATE, AND BLOOD PRESSURE WERE MEASURED. GLOBAL ASSESSMENT OF RECENT STRESS SCALE AND SPIELBERGERS STATE ANXIETY SCORE WERE ASSESSED AT BASELINE AND DURING THE EXAMINATION. SERUM CORTISOL LEVELS, IL-4, AND IFN-GAMMA LEVELS WERE DETERMINED BY ENZYME-LINKED IMMUNOSORBENT ASSAY TECHNIQUE. RESULT: IN THE YOGA GROUP, NO SIGNIFICANT DIFFERENCE WAS OBSERVED IN PHYSIOLOGICAL PARAMETERS DURING THE EXAMINATION STRESS, WHEREAS IN THE CONTROL GROUP, A SIGNIFICANT INCREASE WAS OBSERVED. LIKEWISE, THE INDICATORS OF PSYCHOLOGICAL STRESS SHOWED HIGHLY SIGNIFICANT DIFFERENCE IN CONTROL GROUP COMPARED WITH SIGNIFICANT DIFFERENCE IN YOGA GROUP. DURING THE EXAMINATION, THE INCREASE IN SERUM CORTICAL AND DECREASE IN SERUM IFN-GAMMA IN YOGA GROUP WAS LESS SIGNIFICANT (P<0.01) THAN IN THE CONTROL GROUP (P<0.001). BOTH THE GROUPS DEMONSTRATED AN INCREASE IN SERUM IL-4 LEVELS, THE CHANGES BEING INSIGNIFICANT FOR THE DURATION OF THE STUDY. CONCLUSION: YOGA RESISTS THE AUTONOMIC CHANGES AND IMPAIRMENT OF CELLULAR IMMUNITY SEEN IN EXAMINATION STRESS.	2011