Origenes M M, Blank S E, Schoene R B
Department of Physical Education, Sport and Leisure Studies, Washington State University, Pullman 99164.
Med Sci Sports Exerc. 1993 May;25(5):608-12.
The aero-cycling posture has become increasingly popular among cyclists. Because of the potential for altered lung mechanics in the aero-cycling posture, the ventilatory and gas exchange profiles of 10 moderately trained males (31.1 +/- 6.3 yr, mean +/- SD) exercising on a cycle ergometer in the upright posture (UC) and aero-cycling (AC) posture were studied. Exercise consisted of 3-min work stages with 50-W incremental changes until volitional exhaustion. Ventilatory and gas exchange responses to exercise were averaged each minute. Maximal oxygen consumption (54.3 +/- 6.3 vs 53.4 +/- 6.9 ml.kg-1.min-1) in the UC and AC were not significantly different. Maximal values for ventilation (132.5 +/- 32.3 vs 128.0 +/- 28.7 l.min-1), tidal volume (2.7 +/- 0.5 vs 2.6 +/- 0.3 1.br-1), breathing frequency (50.0 +/- 8.0 vs 47.0 +/- 5.0 br.min-1), and submaximal ventilatory and heart rate responses in the UC were not significantly different compared with the AC. No significant difference existed between postures for mean inspiratory flow and inspiratory duty cycle at comparable submaximal power outputs. These results indicate that at absolute power outputs, ventilatory responses, as determined by respiratory pattern and timing, and metabolic cost, were similar in the UC and AC. Thus, the AC does not impair physiologic responses to high intensity exercise.
空气动力学骑行姿势在自行车骑行者中越来越受欢迎。由于空气动力学骑行姿势可能改变肺部力学，因此研究了10名中度训练的男性（31.1±6.3岁，平均值±标准差）在直立姿势（UC）和空气动力学骑行（AC）姿势下在自行车测力计上运动时的通气和气体交换情况。运动由3分钟的工作阶段组成，功率以50瓦递增，直至自愿疲劳。每分钟对运动的通气和气体交换反应进行平均。UC和AC中的最大耗氧量（54.3±6.3对53.4±6.9 ml·kg-1·min-1）无显著差异。UC中的通气最大值（132.5±32.3对128.0±28.7 l·min-1）、潮气量（2.7±0.5对2.6±0.3 l·br-1）、呼吸频率（50.0±8.0对47.0±5.0 br·min-1）以及次最大通气和心率反应与AC相比无显著差异。在相当的次最大功率输出下，平均吸气流量和吸气占空比在姿势之间没有显著差异。这些结果表明，在绝对功率输出下，由呼吸模式和时间决定的通气反应以及代谢成本在UC和AC中相似。因此，AC不会损害对高强度运动的生理反应。
