Sedlock D A, Knowlton R G, Fitzgerald P I
Exercise Physiology Laboratory, Purdue University, West Lafayette, IN 47907.
Eur J Appl Physiol Occup Physiol. 1988;57(1):55-9. doi: 10.1007/BF00691238.
The purpose of this investigation was to examine the cardiovascular and metabolic effects of a 5 wk arm crank (AC) training program on submaximal wheelchair (WC) ergometry in able-bodied women. The 6 subjects in the training group (TG) and 4 in the control group (CG) performed a 10 min WC exercise prior to and following the training period at a power output (PO) that elicited 70% of the pre-training peak oxygen uptake (VO2). Steady state VO2, heart rate (HR), cardiac output (Qc) and stroke volume (Vs) were measured. Resting and post-exercise blood lactate concentrations (LA) were measured, the difference was recorded as net LA. The TG exercised on the AC 3 d.wk-1 at a PO that elicited 85% of each subject's recorded peak HR. Each session consisted of four 4 min exercise bouts preceded by a 2 min warm-up and interspersed with 2 min rest periods. After training, the TG had a significantly (p less than 0.05) lower HR, larger Vs and lower LA in response to the WC exercise. Qc and VO2 were not significantly altered. The results demonstrate that the AC exercise program used in this study produced a physiological training effect which was observed during submaximal WC exercise of an intensity frequently encountered during daily WC ambulation. It appears that short-term, moderate intensity AC training offers an adequate stimulus to reduce the stress imposed by wheelchair locomotion.
本研究的目的是检验一项为期5周的手臂曲柄（AC）训练计划对健全女性次最大强度轮椅（WC）测力计测试时心血管和代谢方面的影响。训练组（TG）的6名受试者和对照组（CG）的4名受试者在训练期前后，以能引出训练前峰值摄氧量（VO2）70%的功率输出（PO）进行了10分钟的WC运动。测量了稳态VO2、心率（HR）、心输出量（Qc）和每搏输出量（Vs）。测量了静息和运动后血乳酸浓度（LA），其差值记录为净LA。TG组每周3天以能引出每个受试者记录的峰值HR 85%的PO在AC上进行运动。每次训练由四组4分钟的运动回合组成，之前有2分钟的热身，中间穿插2分钟的休息时间。训练后，TG组在进行WC运动时HR显著降低（p<0.05），Vs增大，LA降低。Qc和VO2没有显著变化。结果表明，本研究中使用的AC运动计划产生了一种生理训练效果，在日常WC行走中经常遇到的强度的次最大强度WC运动期间可以观察到这种效果。看来，短期、中等强度的AC训练提供了足够的刺激，以减轻轮椅移动所施加的压力。
