成年人身体的自然衰老伴随诸多人类神经肌肉系统的功能性损伤,较为常见的一种是收缩肌肉群的损耗,称为少肌症。肌肉群损耗主要是因为可运动单元的消失伴剩余肌肉纤维萎缩,但不只是肌肉群的损耗导致老年人肌肉功能受损,肌纤维类型和肌球蛋白重链亚型表达改变也会造成肌肉衰弱、迟缓、收缩功能降低。本研究重点关注与人体自然衰老、年龄相关性疲劳、不同年龄段肌肉收缩活动力量差异等相关的运动单位消耗。 Natural aging in adults with many of the human neuromuscular system of functional damage, the more common one is the loss of contraction of muscle groups, known as sarcopenia. Muscle group loss is mainly due to the disappearance of the movable unit with the remaining muscle fiber atrophy, but not only the loss of muscle groups leading to impaired muscle function in the elderly, muscle fiber types and changes in expression of myosin heavy chain subtypes can also cause muscle weakness, Slow, reduced systolic function. This study focuses on the consumption of exercise units related to the natural aging of the human body, age-related fatigue, differences in muscle contractile activity at different ages and the like.