Weight gain and unfavorable body composition are prevalent among midlife and older women; shifts in these characteristics can have detrimental implications on emotional and physical health and longevity. Efforts to attenuate weight-related factors detailing the potential development of obesity are traditionally driven by manipulation of nutrition and/or physical activity; however, sustained results are limited. Novel and integrative approaches are needed to reduce the burden of adverse changes in weight and associated consequences.

This dissertation is built around a model of effects of Tai Chi/Qigong in body composition and a pilot test of this intervention and model factors in a group of midlife/older women (N = 36). Three resulting manuscripts include: 1) a proposed biobehavioral model detailing how a Tai Chi/Qigong intervention may improve weight-related outcomes through psychological, behavioral, and physiological pathways, 2) a paper examining pre- to post- intervention differences in the primary outcomes of percent body fat, sleep quality, and emotional eating and the exploratory outcomes of perceived stress, mood state, mindfulness, self-compassion and body awareness; and 3) an exploratory analysis examining correlations between primary (sleep quality, emotional eating), exploratory (perceived stress, mood state, mindfulness, self-compassion and body awareness), and neurophysiological (heart rate variability) outcomes of interest—further, regression models were conducted to explore the predictive value of the independent variables on the dependent variables and associated changes.

In manuscript two, dependent t-tests were used to assess pre/post-differences (percent body fat and survey measures); this single group study (8-weeks of Tai Chi/Qigong) did not have a control group. Results of manuscript two demonstrate significant changes in sleep quality (p = .04), perceived stress (p = .05), and body awareness (p = .01). Findings of manuscript three indicate changes in the dependent variable of sleep quality were partially explained by perceived stress (adjusted R2 = 13.4%) and changes in the dependent variable of emotional eating were significantly explained by self-compassion (adjusted R2 = 42.1%). In the context of weight gain and unfavorable body composition in midlife/older women, results of this pilot study, using a standardized Tai Chi/Qigong intervention, indicate that select psycho-emotional factors may be important to explore further.