婴儿上肢近端肌肉控制的发展：从变化到选择。
Development of proximal arm muscle control during reaching in young infants: from variation to selection.
机构信息
Department Paediatrics - Developmental Neurology, University Medical Center Groningen, University of Groningen, Hanzeplein 1, 9713 GZ Groningen, The Netherlands.
出版信息
Infant Behav Dev. 2010 Feb;33(1):30-8. doi: 10.1016/j.infbeh.2009.10.006. Epub 2009 Nov 27.
UNLABELLED
Reaching movements are initiated by activity of the prime mover, i.e. the first activated arm muscle. We aimed to investigate the relationship between prime mover activity and kinematics of reaching in typically developing (TD) infants in supine and sitting position. Fourteen infants were assessed at 4 and 6 months during reaching in supine and supported sitting. Kinematics and EMG-activity of deltoid, pectoralis major, biceps (BB) and triceps brachii were recorded. Kinematic analysis focused on number of movement units (MUs) and transport MU (MU with longest duration). Prime mover use was variable, but at 6 months a dominance of BB emerged in both testing conditions. Kinematics were also variable, but with increasing age the number of MU decreased and the relative proportion of the transport MU increased. BB as prime mover at 6 months was related to a larger transport MU.
CONCLUSION
Between 4 and 6 months BB prime mover dominance emerges which is related to relatively efficient reaching characteristics.
未加标签
伸手运动是由原动肌（即第一个被激活的手臂肌肉）的活动引发的。我们旨在研究在仰卧和坐姿中，正常发育（TD）婴儿的原动肌活动与伸手运动的运动学之间的关系。在 4 个月和 6 个月时，14 名婴儿在仰卧和支撑坐姿中进行了伸手评估。记录三角肌、胸大肌、肱二头肌（BB）和肱三头肌的运动学和肌电图活动。运动学分析重点关注运动单位（MU）的数量和传输 MU（持续时间最长的 MU）。原动肌的使用是可变的，但在 6 个月时，在两种测试条件下，BB 都占据主导地位。运动学也是可变的，但随着年龄的增长，MU 的数量减少，传输 MU 的相对比例增加。6 个月时使用 BB 作为原动肌与较大的传输 MU 有关。
结论
在 4 至 6 个月之间，BB 原动肌主导地位出现，这与相对高效的伸手特征有关。
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