Drescher U, Mookerjee S, Steegmanns A, Knicker A, Hoffmann U
Institute of Physiology and Anatomy, Am Sportpark Müngersdorf 6, German Sport University Cologne, Cologne, 50933, Germany.
Department of Exercise Science, 400 E. 2nd St, Bloomsburg University, Bloomsburg, PA, 17815, USA.
Respir Physiol Neurobiol. 2017 Jun;240:53-60. doi: 10.1016/j.resp.2017.02.003. Epub 2017 Feb 17.
To evaluate the effects of exercise velocity (60, 150, 240deg∙s) and muscle mass (arm vs leg) on changes in gas exchange and arterio-venous oxygen content difference (avDO) following high-intensity concentric-eccentric isokinetic exercise.
Fourteen subjects (26.9±3.1years) performed a 3×20-repetition isokinetic exercise protocol. Recovery beat-to-beat cardiac output (CO) and breath-by-breath gas exchange were recorded to determine post-exercise half-time (t) for oxygen uptake (V˙Opulm), carbon dioxide output (V˙COpulm), and ventilation (V˙).
Significant differences of the t values were identified between 60 and 150deg∙s. Significant differences in the t values were observed between V˙Opulm and V˙COpulm and between V˙COpulm and V˙. The time to attain the first avDO-peak showed significant differences between arm and leg exercise.
The present study illustrates, that V˙Opulm kinetics are distorted due to non-linear CO dynamics. Therefore, it has to be taken into account, that V˙Opulm may not be a valuable surrogate for muscular oxygen uptake kinetics in the recovery phases.
评估运动速度（60、150、240度/秒）和肌肉量（上肢与下肢）对高强度向心-离心等速运动后气体交换和动静脉氧含量差（avDO）变化的影响。
14名受试者（26.9±3.1岁）进行了一项3×20次重复的等速运动方案。记录运动后逐搏心输出量（CO）和逐次呼吸气体交换情况，以确定运动后氧摄取（V˙Opulm）、二氧化碳排出（V˙COpulm）和通气量（V˙）的半恢复时间（t）。
60度/秒和150度/秒之间的t值存在显著差异。在V˙Opulm和V˙COpulm之间以及V˙COpulm和V˙之间观察到t值有显著差异。达到第一个avDO峰值的时间在上肢运动和下肢运动之间显示出显著差异。
本研究表明，由于非线性CO动力学，V˙Opulm动力学发生扭曲。因此，必须考虑到，在恢复阶段V˙Opulm可能不是肌肉氧摄取动力学的一个有价值的替代指标。
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