Motor unit fibre density in the extensor digitorum communis muscle. Single fibre electromyographic study in normal subjects at different ages.
Motor unit fibre density in the extensor digitorum communis muscle. Single fibre electromyographic study in normal subjects at different ages.
复制标题
指总伸肌中的运动单位纤维密度。
DOI：
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发表时间：
1975
影响因子：
11
通讯作者：
B. Thiele
中科院分区：
文献类型：
--
作者：
E. Stålberg;B. Thiele
本文报道了10 ~ 89岁成人趾总伸肌单纤维肌电图的研究。在电极的摄取区域内的相同运动单位中由肌纤维产生的单个肌纤维动作电位的平均数量被用作运动单位纤维密度的量度。纤维密度在人的一生中缓慢增加，70岁后增长更快。同时，指示受损神经或神经肌肉冲动传递的记录的数量增加。研究结果表明，随着年龄的增长，运动神经元的退行性丧失，通过神经再支配得到补偿。与其他肌肉相比，指总伸肌的变化相对轻微，这使得该肌肉的早期病理变化与年龄因素无关。
A single fibre EMG study is presented from extensor digitorum communis muscle in sujbects aged 10 to 89 years. The average number of single muscle fibre action potentials generated by muscle fibres in the same motor unit within the uptake area of the electrode is used as a measure of the motor unit fibre density. The fibre density increases slowly during life with a faster progression after the age 70 years. The number of recordings indicating impaired nerve or neuromuscular impulse transmission increases at the same time. The findings indicate degenerative loss of motor neurones with aging, compensated for by reinnervation. The changes are relatively slight in the extensor digitorum communis muscle as compared with other muscles, permitting early pathological changes in this muscle to be recognized independently of age factors.