Changes in distal muscle timing may contribute to slowness during sit to stand in Parkinsons disease
Changes in distal muscle timing may contribute to slowness during sit to stand in Parkinsons disease
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DOI：
10.1016/j.clinbiomech.2004.08.002
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Marjama-Lyons, J
中科院分区：
文献类型：
--
作者：
Bishop, M;Brunt, D;Marjama-Lyons, J
目标。目的：比较帕金森氏症患者坐位站立时，腿部肌肉的激活模式和随后的力量。在一些帕金森氏症患者的前向运动过程中，包括坐到站，胫骨前肌/比目鱼肌的相互作用中断。这项任务是独立的主要决定因素，44%的帕金森症患者报告有困难。41名帕金森症患者被要求从长椅上站起来。测量了峰值加速度和垂直地面反作用力、到达这些峰值的斜率和事件发生的时间。在胫骨前肌和比目鱼肌放置表面电极。慢速组产生力量的速度慢于快组。慢速组的完成屈曲-动量阶段的时间占站立时间的%，而快组的时间为56%。慢速组的联合收缩试验所占比例高于其他组。由于离开座位的时间更长，速度较慢的受试者完成任务所需的时间更长。胫骨前肌收缩力不足可能导致加速力产生速度的降低和坐位下架所需时间的延长。
Objective. To compare patterns of muscle activation in the lower extremity and subsequent forces during sit to stand in persons with Parkinsonism.Background. There is an interruption of the tibialis anterior/soleus interaction during forward oriented movements in some subjects with Parkinsonism, including sit to stand. This task is a major determinant of independence and 44% of those with Parkinsonism report difficulty.Methods. 41 subjects with Parkinsonism were asked to stand up from a bench. Peak acceleration and vertical ground reaction forces, the slopes to these peaks, and the timing of events were measured. Surface electrodes were placed on tibialis anterior and soleus.Results. The slower group produced force at slower rate than the fast group. The slower group spent 64% of the time taken to stand to complete the flexion-momentum phase, and the fast group spent 56%. The slower group had a larger proportion of co-contraction trials than the other groups.Conclusions. Slower subjects took longer to perform the task due to a longer time for seat off. Deficits recruiting tibialis anterior may contribute to the decreased rate of production of the acceleration forces and the longer time required for seat off.