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short-term influence of a single session of aerobic exercise on plasma lipids and lipoproteins in postmenopausal women with high or normal cholesterol levels
xiv, 324 leaves : illustrations ; 28 cm.
The purpose of this investigation was to examine the short-term response of blood lipids and lipoproteins to a single prolonged session of aerobic exercise in postmenopausal women with high compared to normal cholesterol levels. Fasting blood samples were obtained from twelve women with moderately high cholesterol (MHC) levels, and thirteen women with normal cholesterol (NC) levels (age [] = 53.6 [] 1.3 yr, weight [] = 68. l [] 2.4 kg, relative body fat [] = 33.3 []t l .1 %, VO[] = 1469.8 [] 53.9 mL/min). Samples were taken 24 hr prior to (PRE), immediately post-exercise (IPE), and at 24 (24 HR) and 48 hr (48 HR) after a single exercise session (treadmill walking at 70 % VO[], 400 kcals). Plasma lipid and lipoprotein concentrations were adjusted for plasma volume shifts, and all samples were analyzed utilizing standard analytic methodology for plasma concentrations of total cholesterol (TC), triglycerides (TG), high-density lipoprotein (HDL-C) and its subfraction HDL₃-C. Low-density lipoprotein (LDL-C), the HDL₂-C subfraction, very low-density lipoprotein (VLDL-C), and the TC/HDL-C, LDL-C/HDL-C, and HDL₂-C/HDL₃-C ratios were all subsequently calculated. Multivariate analysis for repeated measures, 2 (GROUP) x 4 (TIME), repeated for TIME, (p < 0.05), revealed the following significant results: 1) at baseline, no significant differences were noted for age, body composition or exercise capacity, however, concentrations of TC, FC, and LDL-C were higher in the MHC group; 2) initial lipid differences did not influence the lipid response to the exercise session; 3) TG and VLDL-C concentrations were significantly reduced at 24 HR after exercise, but returned to PRE levels be 48 HR; 4) no exercise-induced changes were noted for TC, LDL-C, FC, HDL-C, HDL₂-C or HDL₃-C, although HDL-C demonstrated a trend towards an increased concentration at 24 HR after exercise (p < 0. 10). On the basis of these results, it was concluded that in postmenopausal women, the lipid response to a single session of exercise is independent of the initial plasma cholesterol concentrations. In addition, a single session of prolonged exercise elicits significant short-term alterations in blood lipids and lipoproteins in postmenopausal women.
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Includes bibliographical references (leaves 141-160).