Human motor units studied by spike-triggered averaging and intraneural motor axon stimulation.
Human motor units studied by spike-triggered averaging and intraneural motor axon stimulation.
复制标题
通过尖峰触发平均和神经内运动轴突刺激研究人体运动单位。
DOI：
10.1007/978-1-4899-1016-5_12
复制
发表时间：
1995
影响因子：
--
通讯作者：
Thomas,CK
中科院分区：
文献类型：
--
作者：
Thomas,CK
当低阈值运动单位在持续、弱的自主收缩期间以低速率激活时，大多数单位力曲线表现出疲劳，但有些表现出力增强。这些数据，通过尖峰触发的平均值，比较的抗疲劳性的人的运动单位激活抽搐和强直率神经内运动轴突刺激。与后一种技术，从一个肌肉群的运动单位的代表性采样表明，单位力疲劳或增强在次最大频率，和收缩率的变化，决定单位力频率关系的变化。更多样化的疲劳协议，并在可能的情况下，仔细比较这两种技术获得的数据，需要进一步了解的力量和频率变化的单个运动单位在自愿和刺激运动。
When low-threshold motor units are activated at low rates during sustained, weak voluntary contractions, most unit force profiles exhibit fatigue but some show force potentiation. These data, obtained by spike-triggered averaging, are compared to the fatigue resistance of human motor units activated at twitch and tetanic rates by intraneural motor axon stimulation. With the latter technique, representative sampling of the motor units from one muscle group shows that unit force fatigue or potentiation at submaximal frequencies, and contractile rate changes, dictate the shifts in unit force-frequency relationships. More diverse fatigue protocols, and when possible, careful comparisons of data obtained by both these techniques, are needed to further our understanding of the force and frequency changes of single motor units during voluntary and stimulated exercise.