Lenton J P, Fowler N, van der Woude L, Goosey-Tolfrey V L
Exercise and Sport Science, The Manchester Metropolitan University, Cheshire, United Kingdom.
Int J Sports Med. 2008 May;29(5):384-9. doi: 10.1055/s-2007-965569. Epub 2007 Sep 18.
The purpose of this study was to determine the contributions of arm frequency and propulsion mode on the internal work during submaximal wheelchair propulsion. Twelve able-bodied participants performed a V.O (2) peak test on a wheelchair ergometer. On a separate occasion, six (4 min) submaximal exercise conditions employing two modes of propulsion (synchronous, SYN vs. asynchronous, ASY) at arm frequencies of 40 and 80 rev . min (-1) were performed at 1.2 m . s (-1) and 1.7 m . s (-1). These conditions resulted in three push strategy combinations (ASY [20 : 20], SYN [40 : 40] & ASY [40 : 40]) at two speeds. Gross, net, work and delta efficiency were determined. The cost of unloaded exercise was significantly lower for the ASY [20 : 20] than both ASY and SYN [40 : 40] (0.49 vs. 0.58 and 0.57 L . min (-1), respectively). All the efficiency indices decreased as velocity increased (p < 0.01). ASY [20 : 20] was the least efficient (gross and work) mode (4.2 +/- 0.4 % and 6.2 +/- 0.8 % respectively). Comparison of equal arm frequencies (ASY [40 : 40] vs. SYN [40 : 40]); found the efficiency to be lower for ASY propulsion (p < 0.05). Under the current testing conditions SYN propulsion mode offers greater efficiency during wheelchair propulsion.
本研究的目的是确定在次最大强度轮椅推进过程中，手臂频率和推进模式对内部功的影响。12名身体健全的参与者在轮椅测力计上进行了最大摄氧量（V.O₂）峰值测试。在另一个时间点，以1.2米/秒和1.7米/秒的速度，在40转/分钟和80转/分钟的手臂频率下，采用两种推进模式（同步，SYN与异步，ASY）进行了6种（4分钟）次最大强度运动条件测试。这些条件在两种速度下产生了三种推策略组合（ASY [20 : 20]、SYN [40 : 40]和ASY [40 : 40]）。测定了总功、净功、功和效率增量。ASY [20 : 20]的无负荷运动成本显著低于ASY和SYN [40 : 40]（分别为0.49升/分钟，而ASY和SYN [40 : 40]分别为0.58升/分钟和0.57升/分钟）。所有效率指标均随速度增加而降低（p < 0.01）。ASY [20 : 20]是效率最低（总功和功）的模式（分别为4.2±0.4%和6.2±0.8%）。比较相同手臂频率（ASY [40 : 40]与SYN [40 : 40]）发现，ASY推进的效率较低（p < 0.05）。在当前测试条件下，SYN推进模式在轮椅推进过程中效率更高。
