Takahashi T, Miyamoto Y
Department of Electrical and Information Engineering, Faculty of Engineering, Yamagata University, Yonezawa, Japan.
Eur J Appl Physiol Occup Physiol. 1998 Mar;77(4):305-11. doi: 10.1007/s004210050338.
To examine the influence of light exercise on cardiac responses during recovery from exercise, we measured heart rate (HR), stroke volume (SV), and cardiac output (Qc) in five healthy untrained male subjects in an upright position before, during, and after 10-min steady-state cycle exercise at an exercise intensity of 170 W, corresponding to a mean of 68 (SD 4)% of maximal oxygen uptake. The recovery phase was evaluated separately for three different conditions: 10 min of complete rest (passive recovery), 7 min of pedalling at 20-W exercise intensity followed by 3 min of rest (partially active recovery), and 7 min of pedalling at 40-W exercise intensity followed by 3 min of rest (partially active recovery), on an upright cycle ergometer. The time courses of decreases in HR in the two active recovery phases at different exercise intensities were almost identical to those in the passive recovery phase. However, the subsequent HR reductions during the rest after active recovery at 20 W and at 40 W were mean 7.5 (SD 4.4) and mean 10.0 (SD 3.1) beats x min(-1), respectively, both of which were significantly larger (P < 0.05 and P< 0.005) than the corresponding reduction [1.4 (SD 2.5) beats min(-1)] for passive recovery. The SV values at the two exercise intensities during the active recovery periods were maintained at levels similar to that during 170-W steady-state exercise. In contrast, the SV during passive recovery decreased gradually to a level significantly below the initial baseline level at rest before exercise (P < 0.05). The resultant time courses of CO values during active recovery were significantly higher (each P < 0.05) than that during passive recovery. It was concluded from these findings that light post-exercise physical activity plays an important role in facilitating the venous return from the muscles and in restoring the elevated HR to the pre-exercise resting level.
为研究轻度运动对运动恢复过程中心脏反应的影响，我们在5名未经训练的健康男性受试者处于直立位时，测量了他们在170W稳态骑行运动前、运动中和运动后的心率（HR）、每搏输出量（SV）和心输出量（Qc），该运动强度对应于最大摄氧量均值的68（标准差4）%。在直立式自行车测力计上，分别针对三种不同情况评估恢复阶段：10分钟完全休息（被动恢复）、以20W运动强度蹬踏7分钟后休息3分钟（部分主动恢复）、以40W运动强度蹬踏7分钟后休息3分钟（部分主动恢复）。在不同运动强度的两个主动恢复阶段，心率下降的时间进程与被动恢复阶段几乎相同。然而，在20W和40W主动恢复后的休息期间，随后的心率降低分别平均为7.5（标准差4.4）次/分钟和平均10.0（标准差3.1）次/分钟，两者均显著大于被动恢复时相应的降低幅度[1.4（标准差2.5）次/分钟]（P<0.05和P<0.005）。主动恢复期间两个运动强度下的每搏输出量值维持在与170W稳态运动期间相似的水平。相比之下，被动恢复期间的每搏输出量逐渐下降至显著低于运动前休息时初始基线水平的程度（P<0.05）。主动恢复期间心输出量的时间进程显著高于被动恢复期间（各P<0.05）。从这些发现得出结论，运动后轻度体力活动在促进肌肉静脉回流以及将升高的心率恢复到运动前静息水平方面发挥重要作用。
