Depressed mood but not fatigue mediate the relationship between physical activity and perceived stress in middle-aged women.
OBJECTIVE
To determine whether depressed mood and fatigue mediate the relationships between physical activity, body mass index, menopausal hot flashes, and perceived stress.


METHODS
This study is a secondary analysis of data obtained from a sub-sample of peri- and postmenopausal women (N=212) from the TREMIN Research Program on Women's Health.


RESULTS
The hypothesized mediational model was tested using path analysis within a structural equation modeling framework in Mplus Version 5.1. In unadjusted analysis, the relationships between physical activity, menopausal hot flashes, and perceived stress were mediated by depressed mood; fatigue mediated the relationships between hot flashes, body mass index, and perceived stress. When adjusting for age, insomnia, menopausal and hormone use status, the mediational effects of depressed mood on stress remained significant only for physical activity, and fatigue mediated the relationship between hot flashes and stress. The adjusted model explained 70% of variance in perceived stress, 82% of variance in depressed mood, and 81% of variance in fatigue.


CONCLUSIONS
Depressed mood may partially explain the relationship between physical activity and perceived stress in middle-aged women, however further studies are needed to corroborate causality.
Department of Kinesiology, Pennsylvania State University, USA. elavsky@psu.edu
Steriani
S
Elavsky
Carol H
CH
Gold
D015992:Body Mass Index; D003863:Depression; D015444:Exercise / Q000523:psychology*; D005221:Fatigue; D005260:Female; D019584:Hot Flashes / Q000503:physiopathology* / Q000523:psychology; D006801:Humans; D008137:Longitudinal Studies; D008593:Menopause; D008875:Middle Aged; D008954:Models, Biological; D009043:Motor Activity; D013315:Stress, Psychological