Wheelchair propulsion technique and mechanical efficiency after 3 wk of practice
Wheelchair propulsion technique and mechanical efficiency after 3 wk of practice
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DOI：
10.1097/00005768-200205000-00005
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发表时间：
2002-05-01
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影响因子：
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通讯作者：
van der Woude, LHV
中科院分区：
文献类型：
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作者：
de Groot, S;Veeger, D;van der Woude, LHV
德格鲁特，S. H. E. J.维格，A. P.霍兰德，L. H. V.范德伍德。经过3周的练习，轮椅推进技术和机械效率。医学科学。体育Exerc。，第34卷第5期，第756-766页，2002年。目的：有经验和没有经验的轮椅使用者在总机械效率上的差异可能是由推进技术的差异引起的。本实验的目的是研究在3周的轮椅练习期间，一组身体健全的非轮椅使用者在推进技术（由施力、左右对称、周期间变异性和时间定义）和FOSS机械效率的变化。方法：将受试者随机分为实验组（N = 10）和对照组（N = 10）。实验组进行3周的轮椅练习（3周（-1））。即. .9个练习试验)在电脑控制的轮椅测力器上，而对照组只参加了试验1和9。在所有的九次试验中。对推进技术变量和机械效率进行了测量。结果：两组间在用力、左右对称性方面无显著差异。周期间的可变性。与对照组相比，实验组的推压频率和推压阶段开始时的负功率偏转明显降低（P < 0.05）。每周期做功、推工时间、循环时间、机械效率提高。结论：实习期对部分技术变量和机械效率有较好的影响，说明改进后的技术对机械效率有积极的影响。虽然在本研究中没有测量肌肉激活和运动节段特征，但它们也可能影响机械效率。随着时间的推移，大多数受力参数没有发生变化，左右对称。然而，在3周的实践期间，这些变量可能会在另一个时间尺度上发生变化。
DE GROOT, S., H. E. J. VEEGER, A. P. HOLLANDER, and L. H. V. VAN DER WOUDE. Wheelchair propulsion technique and mechanical efficiency after 3 wk of practice. Med. Sci. Sports Exerc., Vol. 34, No. 5, pp. 756-766, 2002. Purpose: Differences in gross mechanical efficiency between experienced and inexperienced wheelchair users may be brought about by differences in propulsion technique. The purpose of this experiment was to study changes in propulsion technique (defined by force application, left-right symmetry, intercycle variability, and timing) and FOSS mechanical efficiency during a 3-wk wheelchair practice period in a group Of novice able-bodied nonwheelchair users. Methods: Subjects were randomly divided over an experimental group (N = 10) and a control group (N = 10). The experimental group received a 3-wk wheelchair practice period (3-wk(-1). i.e.. 9 practice trials) on a computer-controlled wheelchair ergometer, whereas the control group only participated in trials 1 and 9. During all nine practice trials. propulsion technique variables and mechanical efficiency were measured. Results: No significant differences between the groups were found for force application, leff-right symmetry. and intercycle variability. The push frequency and negative power deflection at the start of the push phase diminished significantly in the experimental group in contrast to the control group (P < 0.05). Work per cycle, Push time, cycle time, and mechanical efficiency increased. Conclusion: The practice period had a favorable effect on some technique variables and mechanical efficiency, which may indicate a positive effect of improved technique on mechanical efficiency. Although muscle activation and kinematic Segment characteristics were not measured in the present study, they may also impact mechanical efficiency. No changes occurred over time in most force application parameters, left-right symmetry. and intercycle variability during the 3-wk practice period however, these variables may change oil another time scale.