Peter Harrison Centre for Disability Sport, School of Sport, Exercise & Health Sciences, Loughborough University, Loughborough, UK.
Disabil Rehabil. 2010;32(26):2155-64. doi: 10.3109/09638288.2010.509462.
To investigate the consequence on gross mechanical efficiency (GE), arm frequency and sub-maximal performance, of paced and unpaced practice during asynchronous hand-rim wheelchair propulsion.
Twenty-five able-bodied participants performed five, 4-min exercise bouts at 1.7 m/s, at the freely chosen frequency (FCF) and four paced arm frequencies of 60, 80, 120 and 140% FCF. GE, arm frequency and measures of sub-maximal performance were determined. Participants were assigned to an unpaced (FCF, N = 9), paced (80% FCF, N = 8) or control (CON, N = 8) no practice group. The FCF and 80% FCF groups received 4-weeks (unpaced and paced, respectively) propulsion practice (three sessions·per wk, four 4 min/trials; 33-35 W) at 1.7 m/s on a wheelchair ergometer. Following practice, the pre-testing protocol was repeated.
Mean GE showed a relative increase in both experimental groups (21 and 17%; FCF and 80% FCF respectively; p = 0.001) compared to no change in CON (-1.5%). The FCF arm frequency decreased in both experimental groups (p = 0.001), with larger changes evident following FCF practice.
Four weeks of unpaced or paced practice had a beneficial effect on GE. This improvement seems to be associated with a reduction in arm frequency.
研究在手摇轮椅推进过程中，异步节拍和非节拍练习对总机械效率（GE）、手臂频率和次最大性能的影响。
25 名健康参与者以 1.7m/s 的速度进行了五次 4 分钟的运动，使用自由选择的频率（FCF）和 60、80、120 和 140%FCF 的四个节拍手臂频率。确定 GE、手臂频率和次最大性能的测量值。参与者被分配到非节拍（FCF，N=9）、节拍（80%FCF，N=8）或对照组（CON，N=8）的无练习组。FCF 和 80%FCF 组分别接受 4 周（非节拍和节拍）的推进练习（每次 3 次，每次 4 分钟，共 3 次；33-35W），在轮椅测功仪上以 1.7m/s 的速度进行。练习后，重复预测试程序。
与 CON 组（-1.5%）相比，实验组（FCF 和 80%FCF 组分别为 21%和 17%）的平均 GE 显示出相对增加（p=0.001）。实验组的 FCF 手臂频率均降低（p=0.001），FCF 练习后变化更为明显。
4 周的非节拍或节拍练习对 GE 有有益的影响。这种改善似乎与手臂频率的降低有关。
