D-24 Free Communication/Poster - Exercise Testing and Training: MAY 31, 2007 1:00 PM - 6:00 PM ROOM: Hall E
PURPOSE: We examined the effects of endurance training [12 wk, 5 days/wk, 1 h, 65% peak oxygen consumption (VO2peak)] on changes in maximal oxygen consumption (VO2max), resting blood pressure (BP), resting heart rate, body composition, waist circumference, triglycerides (TG), total cholesterol (TC), high-density lipoprotein (HDL), and low-density lipoprotein (LDL) in postmenopausal women (n=10, 55+/−0.61 yrs).
METHODS: The ten postmenopausal women recruited for the study were sedentary (VO2max=1.69+/−0.08 L/min), normal/moderately overweight (BMI=25.8+/−1.71), healthy, weight-stable, did not have the metabolic syndrome, and were not taking estrogen or any other medications that could affect metabolism. The baseline measurements for blood pressure, triglycerides and lipoprotein levels were all within optimal range (mean BP= 116/73mmHg, mean TG= 96 mg/dL, mean HDL= 59 mg/dL, mean LDL= 115 mg/dL). The exercise intervention was supervised and consisted of pedaling on a cycle ergometer 4 days/wk and walking on a treadmill 1 day/wk. The duration and intensity of exercise training was gradually increased such that by week 5 the subjects were exercising 5 days/week at 65% of their VO2peak. During the last four weeks of training, subjects did interval training on a cycle ergometer 1–2 days/week.
RESULTS: The VO2max and the maximal workload increased significantly after training (+16%, p<0.05 and +25% respectively, p<0.01). Skin caliper measurements indicated a significant decrease in body fat percentage after training (p<0.05). While the results from the DEXA indicated a similar trend, it did not reach significance (p=0.08). Resting blood pressure, resting heart rate, TG, TC, HDL, and LDL did not signficantly change after endurance training (P<0.05 for all variables).
CONCLUSION: These results suggest that in sedentary postmenopausal women with normal levels of TG, TC, HDL, and LDL, endurance training in the absence of weight-loss 1) significantly increases VO2max and maximal workload 2) shows a favorable trend in altering body composition and 3) does not have a significant effect on changing TG, TC, or the lipoprotein levels.