背景:现有的经桡骨假肢接受腔设计没有优化以促进可靠的肌电控制。许多插座设计早于肌电装置的推出。然而,插座设计具有改进的生物力学稳定性,特别是纵向压缩插座,最近几年出现了。无论是随后的影响,如果有的话,在肌电控制下稳定肢体,也没有报道过施加压迫的安排。
方法:十二名身体健全的参与者在三个不同配置中佩戴纵向压缩插座模拟器的同时完成了两个任务:1)压缩,其中压缩支柱被放置在感兴趣的肌肉的顶部,2)救济,其中压缩支柱放置在记录的肌肉的两侧,并且3)未压缩,没有外部压缩。任务是1)单通道肌电目标跟踪练习,其次是2),一项高强度的抓取任务。跟踪任务期间的佩戴者精度,在收缩过程中模拟器相对两侧的压力和肢体疲劳的速率被观察。
结果:对于不同的压缩配置,在跟踪任务准确性得分或疲劳率之间没有观察到显着差异。来自压缩配置的压力记录显示,在肌肉收缩期间,压力保持在模拟器的相对侧。
结论:纵向压迫不抑制单通道肌电图控制,也不能提高疲劳性能。由于肌肉收缩过程中压力的维持,纵向压缩窝具有提高多通道EMG控制可靠性的潜力。
BACKGROUND: Existing trans-radial prosthetic socket designs are not optimised to facilitate reliable
myoelectric control. Many socket designs pre-date the introduction of
myoelectric devices. However, socket designs featuring improved biomechanical stability, notably longitudinal compression sockets, have emerged in more recent years. Neither the subsequent effects, if any, of stabilising the limb on
myoelectric control nor in which arrangement to apply the compression have been reported.
METHODS: Twelve able-bodied participants completed two tasks whilst wearing a longitudinal compression socket simulator in three different configurations: 1) compressed, where the compression strut was placed on top of the muscle of interest, 2) relief, where the compression struts were placed either side of the muscle being recorded and 3) uncompressed, with no external compression. The tasks were 1) a single-channel
myoelectric target tracking exercise, followed by 2), a high-intensity grasping task. The wearers\' accuracy during the tracking task, the pressure at opposing sides of the simulator during contractions and the rate at which the limb fatigued were observed.
RESULTS: No significant difference between the tracking-task accuracy scores or rate of fatigue was observed for the different compression configurations. Pressure recordings from the compressed configuration showed that pressure was maintained at opposing sides of the simulator during muscle contractions.
CONCLUSIONS: Longitudinal compression does not inhibit single-channel EMG control, nor improve fatigue performance. Longitudinal compression sockets have the potential to improve the reliability of multi-channel EMG control due to the maintenance of pressure during muscle contractions.