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Chenges on muscular contractive force and motor units of the aged man with exercise prescription

运动处方对老年人肌肉收缩力和运动单位的影响

基本信息

批准号：
05451133
负责人：
NAGATA Akira
金额：
$ 4.22万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

Health・fitness of aged man were designed quantitatively as performance and activities at daily livehood. At their lifestyle, the exercise prescription was positioned as the measures of the health-fitness promotion and keepness. Those exercise prescription would effect upon the trainability of muscle contractive components and the recruiment of motor units, then their muscle force and non-fatigue performance (the whole endurance) were recorded on various parameters of muscle reflex and responses, muscle torque, electromyography (EMG), evoked EGM (H and M waves), muscle endurance, muscle regulation of the lower limb balance and physical stress during exercise prescription.Method of this study were electromyogram and evoked EMG of various body parts during exercise of aged man. Aged man muscles were observed little atrophy and denervation on various body tremities and motor nerves. Also, slow-twitch oxidative muscle fibers (SO) were appeared at the triceps surae and the quadriceps femur except the posture-gravity muscles. Recruitment of motor units of aged man were characterized on the slower frequency and the lower amplitude of EMG signals during physical exercise. While fast type of motor units were not appeared at whole body muscles, and those moter nerve innervation toward the muscle did not change on the number ratio of the motor nerve and muscle fiber at the aged man.

老年人的健康状况被定量地设计为日常生活中的表现和活动。在他们的生活方式中，运动处方被定位为促进健康和保持健康的措施。运动处方对肌肉收缩成分的可训练性和运动单元的招募产生影响，然后在运动处方期间记录肌肉反射和反应、肌肉转矩、肌电图（EMG）、诱发的EGM （H波和M波）、肌肉耐力、下肢平衡肌肉调节和身体应激等各项参数，并记录其肌肉力量和非疲劳表现（整个耐力）。本研究的方法是对老年人运动过程中各身体部位的肌电图和诱发肌电图进行研究。老年男性各肢体及运动神经均出现少量萎缩及失神经支配。此外，除姿势-重力肌外，肱三头肌表面和股四头肌均出现慢收缩氧化肌纤维（SO）。老年男性在运动过程中运动单元的补充表现为频率较慢、幅度较低的肌电信号。老年人全身肌肉均未出现快速型运动单元，运动神经与肌纤维的数量比未见运动神经支配方向的变化。