Annu Int Conf IEEE Eng Med Biol Soc. 2022 Jul;2022:4155-4158. doi: 10.1109/EMBC48229.2022.9871567.
Spinal cord injuries cause loss of muscle function and subsequently reduce independence. Therapeutic interventions such as transcutaneous spinal cord stimulation are increasingly being used to help improve motor functioning however, a comprehensive understanding of the biomechanical elements of movement may help optimize stimulation protocols. Twenty healthy participants completed five sit-to-stand (STS) transitions while initial knee angle and arm facilitation were altered. Electromyography (EMG) activation of four lower limb muscles and centre of pressure dynamics were recorded. Acute initial knee angles resulted in a change in duration of phases within the STS, and restrictive arm positioning caused the time to completion to increase (p=0.04). Muscle activation patterns across phases were compared and showed significant differences between phases in both the Tibialis Anterior and Rectus Femoris (p<0.006). Acute initial knee angles were also found to significantly increase Biceps Femoris activation across multiple phases (p=0.034). Altering the starting position and limb movement result in vastly different temporal and muscular strategies to complete the STS. Thus, joint angle and upper limb facilitation should be considered when designing rehabilitative interventions for clinical cohorts.
脊髓损伤导致肌肉功能丧失，进而降低独立性。经皮脊髓电刺激等治疗干预措施越来越多地被用于帮助改善运动功能，然而，全面了解运动的生物力学元素可能有助于优化刺激方案。20 名健康参与者在改变初始膝关节角度和手臂辅助的情况下完成了 5 次从坐到站（STS）的转换。记录了四个下肢肌肉的肌电图（EMG）激活和中心压力动力学。急性初始膝关节角度导致 STS 内各阶段的持续时间发生变化，限制手臂位置会导致完成时间增加（p=0.04）。比较了各阶段的肌肉激活模式，发现胫骨前肌和股直肌在各阶段之间存在显著差异（p<0.006）。还发现急性初始膝关节角度显著增加了股二头肌在多个阶段的激活（p=0.034）。改变起始位置和肢体运动导致完成 STS 时的时间和肌肉策略有很大差异。因此，在为临床队列设计康复干预措施时，应考虑关节角度和上肢辅助。
