Effects of Vigorous Versus Restorative Yoga Practice on Objective Cognition Functions in Sedentary Breast and Ovarian Cancer Survivors: A Randomized Controlled Pilot Trial

Abstract

Purpose: Many cancer survivors experience cancer-related cognitive impairment (CRCI). We conducted a randomized controlled pilot trial of 2 types of yoga practice and evaluated their effects on participants' objective cognitive function.

Methods: Sedentary breast or ovarian cancer survivors were randomized to practice either restorative yoga (with more meditative practice and minimal physical exertion) or vigorous yoga (with considerable physical exertion and minimal meditative practice) in 60-minute supervised sessions 3 times a week for 12 weeks, followed by 12 weeks of home practice. We used the NIH Toolbox Cognition Domain to evaluate participants at baseline, week 12, and week 24.

Results: We enrolled 35 participants. For women in the restorative yoga group, overall cognitive function was statistically significantly improved at weeks 12 and 24 compared to baseline (P = .03 and 0.004; Cohen's D = 0.3 and 0.5). Fluid cognitive function also significantly improved at weeks 12 and 24 (P = .02 and 0.0007; Cohen's D = 0.3 and 0.6), whereas improvements in crystallized cognition were not significant. For women in the vigorous yoga group, significant improvement was only seen in tasks of crystallized cognition at week 24 (P = .03; Cohen's D = 0.5). Between-group comparisons showed that at week 24, women in the restorative yoga group had significantly higher scores on fluid cognition tasks.

Conclusions: Patients who participated in yoga practice demonstrated improvement in objective cognitive function over time. Restorative yoga may be more effective in improving fluid cognitive function at week 24 when compared to vigorous yoga. These promising findings should be confirmed in definitive studies.

Trial registration: Clinicaltrials.gov; NCT02305498 (Date Registered: December 2, 2014).

Keywords: CRCI; breast cancer; cancer survivor; cancer-related cognitive impairment; ovarian cancer; yoga.

Conflict of interest statement

Declaration of Conflicting Interests: The author(s) declared the following potential conflicts of interest with respect to the research, authorship, and/or publication of this article: Dr. Mao reports grants from Tibet Cheezheng Tibetan Medicine Co., Ltd. and from Zhongke Health International, LLC outside the submitted work. All other authors declare that they have no conflicts of interest.

Figures

Figure 1.

Fluid cognitive score over time by Yoga Group.

Figure 2.

Crystalized cognitive score over time by Yoga Group.

Figure 3.

Overall cognition function over time by Yoga Group.