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BACKGROUND: Chronic activation of the stress-response can contribute to cardiovascular disease risk, particularly in sedentary individuals. This study investigated the effect of a Bikram yoga intervention on the high frequency power component of heart rate variability (HRV) and associated cardiovascular disease (CVD) risk factors (i.e. additional domains of HRV, hemodynamic, hematologic, anthropometric and body composition outcome measures) in stressed and sedentary adults. METHODS: Eligible adults were randomized to an experimental group (n = 29) or a no treatment control group (n = 34). Experimental group participants were instructed to attend three to five supervised Bikram yoga classes per week for 16 weeks at local studios. Outcome measures were assessed at baseline (week 0) and completion (week 17). RESULTS: Sixty-three adults (37.2 +/- 10.8 years, 79% women) were included in the intention-to-treat analysis. The experimental group attended 27 +/- 18 classes. Analyses of covariance revealed no significant change in the high-frequency component of HRV (p = 0.912, partial eta (2) = 0.000) or in any secondary outcome measure between groups over time. However, regression analyses revealed that higher attendance in the experimental group was associated with significant reductions in diastolic blood pressure (p = 0.039; partial eta (2) = 0.154), body fat percentage (p = 0.001, partial eta (2) = 0.379), fat mass (p = 0.003, partial eta (2) = 0.294) and body mass index (p = 0.05, partial eta (2) = 0.139). CONCLUSIONS: A 16-week Bikram yoga program did not increase the high frequency power component of HRV or any other CVD risk factors investigated. As revealed by post hoc analyses, low adherence likely contributed to the null effects. Future studies are required to address barriers to adherence to better elucidate the dose-response effects of Bikram yoga practice as a medium to lower stress-related CVD risk. TRIAL REGISTRATION: Retrospectively registered with Australia New Zealand Clinical Trials Registry ACTRN12616000867493 . Registered 04 July 2016.
BACKGROUND: Chronic activation of the stress-response can contribute to cardiovascular disease risk, particularly in sedentary individuals. This study investigated the effect of a Bikram yoga intervention on the high frequency power component of heart rate variability (HRV) and associated cardiovascular disease (CVD) risk factors (i.e. additional domains of HRV, hemodynamic, hematologic, anthropometric and body composition outcome measures) in stressed and sedentary adults. METHODS: Eligible adults were randomized to an experimental group (n = 29) or a no treatment control group (n = 34). Experimental group participants were instructed to attend three to five supervised Bikram yoga classes per week for 16 weeks at local studios. Outcome measures were assessed at baseline (week 0) and completion (week 17). RESULTS: Sixty-three adults (37.2 +/- 10.8 years, 79% women) were included in the intention-to-treat analysis. The experimental group attended 27 +/- 18 classes. Analyses of covariance revealed no significant change in the high-frequency component of HRV (p = 0.912, partial eta (2) = 0.000) or in any secondary outcome measure between groups over time. However, regression analyses revealed that higher attendance in the experimental group was associated with significant reductions in diastolic blood pressure (p = 0.039; partial eta (2) = 0.154), body fat percentage (p = 0.001, partial eta (2) = 0.379), fat mass (p = 0.003, partial eta (2) = 0.294) and body mass index (p = 0.05, partial eta (2) = 0.139). CONCLUSIONS: A 16-week Bikram yoga program did not increase the high frequency power component of HRV or any other CVD risk factors investigated. As revealed by post hoc analyses, low adherence likely contributed to the null effects. Future studies are required to address barriers to adherence to better elucidate the dose-response effects of Bikram yoga practice as a medium to lower stress-related CVD risk. TRIAL REGISTRATION: Retrospectively registered with Australia New Zealand Clinical Trials Registry ACTRN12616000867493 . Registered 04 July 2016.
OBJECTIVES: The purpose of this study was to investigate the effect of 16 weeks of Bikram yoga on perceived stress, self-efficacy and health related quality of life (HRQoL) in sedentary, stressed adults. DESIGN: 16 week, parallel-arm, randomised controlled trial with flexible dosing. METHODS: Physically inactive, stressed adults (37.2+/-10.8 years) were randomised to Bikram yoga (three to five classes per week) or control (no treatment) group for 16 weeks. Outcome measures, collected via self-report, included perceived stress, general self-efficacy, and HRQoL. Outcomes were assessed at baseline, midpoint and completion. RESULTS: Individuals were randomised to the experimental (n=29) or control group (n=34). Average attendance in the experimental group was 27+/-18 classes. Repeated measure analyses of variance (intention-to-treat) demonstrated significantly improved perceived stress (p=0.003, partial eta(2)=0.109), general self-efficacy (p=0.034, partial eta(2)=0.056), and the general health (p=0.034, partial eta(2)=0.058) and energy/fatigue (p=0.019, partial eta(2)=0.066) domains of HRQoL in the experimental group versus the control group. Attendance was significantly associated with reductions in perceived stress, and an increase in several domains of HRQoL. CONCLUSIONS: 16 weeks of Bikram yoga significantly improved perceived stress, general self-efficacy and HRQoL in sedentary, stressed adults. Future research should consider ways to optimise adherence, and should investigate effects of Bikram yoga intervention in other populations at risk for stress-related illness. TRIAL REGISTRATION: Australia New Zealand Clinical Trials Registry ACTRN12616000867493. Registered 04 July 2016. URL: http://www.anzctr.org.au/ACTRN12616000867493.aspx.
OBJECTIVES: The purpose of this study was to investigate the effect of 16 weeks of Bikram yoga on perceived stress, self-efficacy and health related quality of life (HRQoL) in sedentary, stressed adults. DESIGN: 16 week, parallel-arm, randomised controlled trial with flexible dosing. METHODS: Physically inactive, stressed adults (37.2+/-10.8 years) were randomised to Bikram yoga (three to five classes per week) or control (no treatment) group for 16 weeks. Outcome measures, collected via self-report, included perceived stress, general self-efficacy, and HRQoL. Outcomes were assessed at baseline, midpoint and completion. RESULTS: Individuals were randomised to the experimental (n=29) or control group (n=34). Average attendance in the experimental group was 27+/-18 classes. Repeated measure analyses of variance (intention-to-treat) demonstrated significantly improved perceived stress (p=0.003, partial eta(2)=0.109), general self-efficacy (p=0.034, partial eta(2)=0.056), and the general health (p=0.034, partial eta(2)=0.058) and energy/fatigue (p=0.019, partial eta(2)=0.066) domains of HRQoL in the experimental group versus the control group. Attendance was significantly associated with reductions in perceived stress, and an increase in several domains of HRQoL. CONCLUSIONS: 16 weeks of Bikram yoga significantly improved perceived stress, general self-efficacy and HRQoL in sedentary, stressed adults. Future research should consider ways to optimise adherence, and should investigate effects of Bikram yoga intervention in other populations at risk for stress-related illness. TRIAL REGISTRATION: Australia New Zealand Clinical Trials Registry ACTRN12616000867493. Registered 04 July 2016. URL: http://www.anzctr.org.au/ACTRN12616000867493.aspx.