Sauro Lynn M, Kanaley Jill A
Department of Exercise Science, Syracuse University, Syracuse, New York 13244, USA.
Eur J Appl Physiol. 2003 Sep;90(1-2):69-75. doi: 10.1007/s00421-003-0863-x. Epub 2003 Jun 14.
Previous research is conflicting concerning the minimum time duration needed to elicit a growth hormone (GH) response to aerobic exercise; thus, the purpose of this project was to examine the effects of mode and duration on exercise-induced GH responses in young women taking oral contraceptives. Nine healthy young females on oral contraceptives exercised at 75% of their mode-specific peak aerobic power ( VO(2)peak) on the treadmill and cycle ergometer for 10, 15 and 20 min, with serial blood samples taken at rest and every 10 min throughout the entire 5.5 h of the study. Each exercise bout was followed by 70 min of rest. A significant ( P<0.02) GH response was observed at the end of exercise regardless of the duration or mode of exercise. The peak GH concentrations were 12.2 (1.8), 10.2 (1.6), and 7.6 (1.5) ng.ml(-1) for the 10-, 15-, and 20-min exercise bouts on the treadmill, respectively. For the cycle ergometer, peak GH concentrations were 9.3 (2.0), 6.3 (1.0), and 9.8 (1.7) ng.ml(-1), respectively. The total integrated area under the curve was not significantly different between the cycle and treadmill exercise for each exercise duration. Moderate-intensity aerobic exercise is sufficient to produce a GH response in as little as 10 min during both treadmill and cycling exercise in young women taking oral contraceptives. Overall, the mode of exercise does not impact the exercise-induced GH response.
以往关于有氧运动引发生长激素（GH）反应所需最短持续时间的研究结果相互矛盾；因此，本项目的目的是研究运动方式和持续时间对口服避孕药的年轻女性运动诱导的GH反应的影响。九名服用口服避孕药的健康年轻女性在跑步机和自行车测力计上以其特定运动方式的峰值有氧功率（VO₂峰值）的75%进行运动，持续10、15和20分钟，并在研究的整个5.5小时内，于静息状态以及每隔10分钟采集一次系列血样。每次运动后休息70分钟。无论运动持续时间或方式如何，在运动结束时均观察到显著的（P<0.02）GH反应。在跑步机上进行10分钟、15分钟和20分钟运动时，GH峰值浓度分别为12.2（1.8）、10.2（1.6）和7.6（1.5）ng/ml⁻¹。对于自行车测力计，GH峰值浓度分别为9.3（2.0）、6.3（1.0）和9.8（1.7）ng/ml⁻¹。在每个运动持续时间内，自行车运动和跑步机运动之间曲线下的总积分面积无显著差异。对于服用口服避孕药的年轻女性，在跑步机和骑自行车运动中，中等强度的有氧运动在短短10分钟内就足以产生GH反应。总体而言，运动方式不会影响运动诱导的GH反应。
