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Meta-Analysis
. 2014 May 13;2014(5):CD010072.
doi: 10.1002/14651858.CD010072.pub2.

Yoga for the primary prevention of cardiovascular disease

Louise Hartley  1 , Mariana Dyakova, Jennifer Holmes, Aileen Clarke, Myeong Soo Lee, Edzard Ernst, Karen Rees
Affiliations
Meta-Analysis

Yoga for the primary prevention of cardiovascular disease

Louise Hartley et al. Cochrane Database Syst Rev. .

Abstract

Background: A sedentary lifestyle and stress are major risk factors for cardiovascular disease (CVD). Since yoga involves exercise and is thought to help in stress reduction it may be an effective strategy in the primary prevention of CVD.

Objectives: To determine the effect of any type of yoga on the primary prevention of CVD.

Search methods: We searched the following electronic databases: the Cochrane Central Register of Controlled Trials (CENTRAL) (2013, Issue 11) in The Cochrane Library; MEDLINE (Ovid) (1946 to November Week 3 2013); EMBASE Classic + EMBASE (Ovid) (1947 to 2013 Week 48); Web of Science (Thomson Reuters) (1970 to 4 December 2013); Database of Abstracts of Reviews of Effects (DARE), Health Technology Assessment Database and Health Economics Evaluations Database (Issue 4 of 4, 2013) in The Cochrane Library. We also searched a number of Asian databases and the Allied and Complementary Medicine Database (AMED) (inception to December 2012). We searched trial registers and reference lists of reviews and articles, and approached experts in the field. We applied no language restrictions.

Selection criteria: Randomised controlled trials lasting at least three months involving healthy adults or those at high risk of CVD. Trials examined any type of yoga and the comparison group was no intervention or minimal intervention. Outcomes of interest were clinical CVD events and major CVD risk factors. We did not include any trials that involved multifactorial lifestyle interventions or weight loss.

Data collection and analysis: Two authors independently selected trials for inclusion, extracted data and assessed the risk of bias.

Main results: We identified 11 trials (800 participants) and two ongoing studies. Style and duration of yoga differed between trials. Half of the participants recruited to the studies were at high risk of CVD. Most of studies were at risk of performance bias, with inadequate details reported in many of them to judge the risk of selection bias.No study reported cardiovascular mortality, all-cause mortality or non-fatal events, and most studies were small and short-term. There was substantial heterogeneity between studies making it impossible to combine studies statistically for systolic blood pressure and total cholesterol. Yoga was found to produce reductions in diastolic blood pressure (mean difference (MD) -2.90 mmHg, 95% confidence interval (CI) -4.52 to -1.28), which was stable on sensitivity analysis, triglycerides (MD -0.27 mmol/l, 95% CI -0.44 to -0.11) and high-density lipoprotein (HDL) cholesterol (MD 0.08 mmol/l, 95% CI 0.02 to 0.14). However, the contributing studies were small, short-term and at unclear or high risk of bias. There was no clear evidence of a difference between groups for low-density lipoprotein (LDL) cholesterol (MD -0.09 mmol/l, 95% CI -0.48 to 0.30), although there was moderate statistical heterogeneity. Adverse events, occurrence of type 2 diabetes and costs were not reported in any of the included studies. Quality of life was measured in three trials but the results were inconclusive.

Authors' conclusions: The limited evidence comes from small, short-term, low-quality studies. There is some evidence that yoga has favourable effects on diastolic blood pressure, HDL cholesterol and triglycerides, and uncertain effects on LDL cholesterol. These results should be considered as exploratory and interpreted with caution.

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Conflict of interest statement

None known.

Figures

1
1
Study flow diagram.
2
2
'Risk of bias' summary: review authors' judgements about each risk of bias item for each included study.
3
3
'Risk of bias' graph: review authors' judgements about each risk of bias item presented as percentages across all included studies.
1.1
1.1. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 1 Systolic blood pressure, change from baseline (mmHg).
1.2
1.2. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 2 Diastolic blood pressure, change from baseline (mmHg).
1.3
1.3. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 3 Total cholesterol, change from baseline (mmol/l).
1.4
1.4. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 4 LDL cholesterol, change from baseline (mmol/l).
1.5
1.5. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 5 HDL cholesterol, change from baseline (mmol/l).
1.6
1.6. Analysis
Comparison 1 Yoga versus no intervention or minimal control, Outcome 6 Triglycerides, change from baseline (mmol/l).
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