Acute effects of walking on serum lipids and lipoproteins in women.
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The purpose of this study was to characterize and evaluate the acute effects of walking performed of fairly light (50% VO2max) and moderate (70% VO2max) intensities on serum lipids and lipoproteins in a group of premenopausal (n = 11) and a group of postmenopausal (n = 10) women. Premenopausal women were (x +/- SEM) 34.5 +/- 1.1 years of age, had 22.8 +/- 1.7% body fat and a 2.47 +/- 0.08 l.min-1 VO2max. Postmenopausal women were 54.8 +/- 2.5 years of age, had 37.9 +/- 0.9% body fat and a 2.06 +/- 0.15 l.min-1 VO2max. All subjects walked on a motor-driven treadmill at each respective intensity of exercise for a total duration sufficient to expend 350 kcal of energy. Dependent variables included total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C) and its subfractions HDL2-C and HDL3-C, low-density lipoprotein cholesterol (LDL-C), and triglycerides (TG). Blood samples were obtained at baseline (pre-exercise), immediately post-exercise (IPE), and at 24 hours and 48 hours post-exercise. A repeated measures design was employed controlling for diet, menstrual cycle periodicity, natural menopause, and plasma volume shifts. A 2 x 4 ANOVA was used to test for differences among means for each group separately. Significant (p < 0.05) time exercise intensity interactions were found for TC and LDL-C for the premenopausal women. This non-parallel change across exercise intensity condition created significant differences at IPE for both TC and LDL-C. Furthermore, an IPE increase in TG (p < 0.05) was observed.(ABSTRACT TRUNCATED AT 250 WORDS)
