Applied Psychophysiology and Biofeedback

, Volume 40, Issue 3, pp 239–249 | Cite as

Yoga for Heart Rate Variability: A Systematic Review and Meta-analysis of Randomized Clinical Trials

  • Paul Posadzki
  • Adrian Kuzdzal
  • Myeong Soo Lee
  • Edzard Ernst
Article

Abstract

The objective of this systematic review is to summarize and critically assess the effects of yoga on heart rate variability (HRV). Nine databases were searched from their inceptions to June 2014. We included randomized clinical trials (RCTs) comparing yoga against any type of control intervention in healthy individuals or patients with any medical condition. Risk of bias was assessed using the Cochrane criteria. Two reviewers performed the selection of studies, data extraction, and quality assessments independent of one another. Fourteen trials met the inclusion criteria. Only two of them were of acceptable methodological quality. Ten RCTs reported favourable effects of yoga on various domains of HRV, whereas nine of them failed to do so. One RCT did not report between-group comparisons. The meta-analysis (MA) of two trials did not show favourable effects of yoga compared to usual care on E:I ratio (n = 61, SMDs = 0.63; 95 % CIs [−0.72 to 1.99], p = 0.36; heterogeneity: r2 = 0.79, χ2 = 5.48, df = 1, (p = 0.02); I2 = 82 %). The MA also failed to show statistically significant differences between the groups regarding the 30:15 ratio (n = 61, SMDs = 0.20; 95 % CIs [−0.43 to 0.84], p = 0.53; heterogeneity: r2 = 0.07, χ2 = 1.45, df = 1, (p = 0.23); I2 = 31 %). The data from the remaining RCTs were too heterogeneous for pooling. These results provide no convincing evidence for the effectiveness of yoga in modulating HRV in patients or healthy subjects. Future investigations in this area should overcome the multiple methodological weaknesses of the previous research.

Keywords

Heart rate variability Complementary and alternative medicine Yoga Systematic review Effectiveness 

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  • Paul Posadzki
    • 1
    • 2
  • Adrian Kuzdzal
    • 3
  • Myeong Soo Lee
    • 4
  • Edzard Ernst
    • 5
  1. 1.University of PlymouthPlymouthUK
  2. 2.Lee Kong Chian School of MedicineA Joint Medical School by Imperial College London and Nanyang Technological UniversitySingaporeSingapore
  3. 3.Centre for Innovative Research in Medical and Natural SciencesRzeszow UniversityRzeszowPoland
  4. 4.Korea Institute of Oriental MedicineDaejeonSouth Korea
  5. 5.University of ExeterExeterUK

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