Electromyographic activity of shoulder muscles during wheelchair propulsion by paraplegic persons
Electromyographic activity of shoulder muscles during wheelchair propulsion by paraplegic persons
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DOI：
10.1016/s0003-9993(96)90166-5
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发表时间：
1996-02-01
影响因子：
4.3
通讯作者：
Perry, J
中科院分区：
文献类型：
--
作者：
Mulroy, SJ;Gronley, JK;Perry, J
目的：记录轮椅推进过程中肩部肌肉活动的阶段性和强度，以识别疲劳和过度使用的风险肌肉。设计和参与者：在静止的测功器上，用导线电极记录17名截瘫患者在推进过程中12块肌肉的肌电活动。主要观察指标：用仪表式推力仪测定推进周期的推进和恢复阶段。用重复测量方差分析比较肌肉间肌电的起搏和停止情况。结果：除冈上肌和背阔肌两种肌型不一致外，其余肌肉在推力和恢复期均有功能。前三角肌、胸大肌、冈上肌、冈下肌、前锯肌、肱二头肌长头6条推行肌在恢复后期(78%~93%周期)出现峰值，峰值出现在前10%周期。胸大肌和冈上肌肌电强度峰值最高(58%和67%)，平均强度最高(35%和27%)。除二头肌(8%周期)(P<；.01)外，晚期推力(17%~23%周期)均停止。5块恢复肌--三角肌、肩胛肌下肌、冈上肌、斜方肌中肌--在推举后期(17%~26%周期)出现肌电起始点，平均强度中等(21%~32%)。这些肌肉有两个肌电峰值(推力结束和恢复中期)。恢复后期停止(82%~91%周期)。结论：最易疲劳的肌肉是胸大肌、冈上肌和恢复肌。建议进行耐力训练。(C)1996年由美国康复医学大会和美国物理医学和康复学会主办。
Objective: Phasing and intensity of shoulder muscle activity during wheelchair propulsion were documented to identify muscles at risk for fatigue and overuse.Design and Participants: Electromyographic (EMG) activity of 12 muscles was recorded with wire electrodes in 17 paraplegic men during propulsion on a stationary ergometer.Main Outcome Measures: Push and recovery phases of the propulsion cycle were determined with an instrumented pushrim. Onset and cessation of EMG were compared between muscles with a repeated measures ANOVA. Average and peak EMG intensity also were identified.Results: All muscles functioned either in push or recovery phases, except supraspinatus, which displayed both patterns, and latissimus dorsi, which was inconsistent. The 6 push phase muscles-anterior deltoid, sternal pectoralis major, supraspinatus, infraspinatus, serratus anterior, and long head of biceps brachii-had onsets in late recovery (78% to 93% cycle) with peak EMG in the first 10% of the cycle. Pectoralis major and supraspinatus had the highest peak (58% and 67% MAX) and average (35% and 27% MAX) EMG intensities in this group. Cessation occurred in late push (17% to 23% cycle) except in biceps brachii (8% cycle) (p < .01). The 5 recovery muscles-middle and posterior deltoid, subscapularis, supraspinatus, and middle trapezius-had EMG onsets in late push (17% to 26% cycle) with moderate average intensities (21% to 32% MAX). These muscles had two EMG peaks (end of push and mid-recovery). Cessation was in late recovery (82% to 91% cycle).Conclusions: Muscles most vulnerable for fatigue were pectoralis major, supraspinatus, and recovery muscles. Endurance training was recommended. (C) 1996 by the American Congress of Rehabilitation Medicine and the American Academy of Physical Medicine and Rehabilitation.