Research Unit of Biomechanics and Rehabilitation Engineering, TU Wien, Austria.
Research Unit of Biomechanics and Rehabilitation Engineering, TU Wien, Austria.
J Biomech. 2019 May 24;89:119-122. doi: 10.1016/j.jbiomech.2019.04.011. Epub 2019 Apr 19.
Approximately ninety percent of the wheelchair users worldwide prefer the conventional push rim mode of propulsion for daily mobility and rehabilitation. Even though push-rim wheelchairs help to promote a healthy life style, the high muscular demand and the non-continuous push motions can lead to serious upper extremity injuries. In this study, muscle EMG data of ten healthy subjects were recorded for a newly introduced handle based propulsion mechanism (HBP) and compared to conventional push-rim propulsion at two workloads, 25 W and 35 W respectively. The results for the mean peak muscle activations at both workloads demonstrate that push-rim propulsion leads to higher peak muscle activity compared to HBP at a similar wheelchair forward velocity of 1.11 m/s. The generation of these high peak muscle activations with increasing loads in push-rim propulsion over time can lead to overuse injuries. Overall, the use of the HBP mechanism is less straining to the muscles and may reduce fatigue during prolonged propulsion.
全球约 90%的轮椅使用者更喜欢传统的推轮辋模式来进行日常活动和康复。尽管推轮辋轮椅有助于促进健康的生活方式，但高肌肉需求和非连续的推动动作可能导致严重的上肢损伤。在这项研究中，记录了十位健康受试者的肌肉肌电图数据，用于新引入的基于手柄的推进机构（HBP），并与传统的推轮辋推进在两个工作负载下进行了比较，分别为 25W 和 35W。在这两个工作负载下，平均峰值肌肉激活的结果表明，与以相似的轮椅前进速度 1.11m/s 相比，推轮辋推进导致的峰值肌肉活动更高。随着时间的推移，推轮辋推进中负载的增加会产生这些高峰值肌肉活动，从而导致过度使用损伤。总的来说，使用 HBP 机构对肌肉的压力较小，可能会减少长时间推进过程中的疲劳。
