EFFECTS OF AGE ON MUSCLE STRENGTH, BODY COMPOSITION AND HEALTH STATUS

这项研究正在研究与年龄有关的 肌肉力量的变化来决定 年龄和力量水平与身体的关系 组成和健康状况。 年龄的关系 最大的力量生产（力量）的上部和 下半身肌肉组织在同心（缩短） 运动的偏心（伸长）阶段是 目前正在建立。 此外，实力 对措施的评估分为慢、快和零 （等距）速度，以确定是否有一个 随着年龄的增长，在快速运动时优先失去力量。 壮年时期兵力生产变化分析 移动者与对手的变化进行比较 肌肉群，以确定肌肉平衡是否受到影响 随年龄 此外，最大力的角度 正在评估生产，以确定该角度是否 随着年龄的变化而变化。近400名男性和女性受试者 从20年代到80年代都进行了测试， 实施. 年龄相关的下降被发现在横截面 同心和偏心测试分析 所有的肌肉群和速度。下跌速度 股四头肌比二头肌更大 臂。同心圆和偏心圆的下降率 强度趋于平行。 LSB提出了一项长期倡议，即“BLSA倡议 功能性能力的变化 （脆弱）。“该倡议包括三个项目：1） 为儿童制定定量功能评估， 2）研究视力变化对 性能;以及，3）目前正在制定一项协议 开发用于估计年龄相关变化的作用 在周围神经上的年龄相关的变化， 肌肉力量我们计划估计 功能性运动单位和跟踪纵向变化 在力量和单位计数上。

This study is examining the natural course of age-related changes in muscular strength to determines the relationship of age and strength levels to body composition and health status. The relationship of age to maximal force production (strength) of the upper and lower body musculature during the concentric (shortening) and eccentric (elongation) phases of movement are presently being established. In addition, strength measures are being assessed at slow, fast and zero (isometric) speeds to determine if there is a preferential loss of force at fast speeds with age. Analyses of changes in force production in the prime mover is being compared to changes in the antagonist muscle group to determine if muscle balance is affected with age. In addition, the angle of greatest force production is being assessed to determine if this angle changes with age. Almost 400 male and female subjects from the 20s through the 80s have been tested since implementation. Age associated declines are found in cross-sectional analysis for both concentric and eccentric testing for all muscle groups and speeds. The rate of decline is greater in the quadriceps femoris than for the biceps brachii. The rates of decline in concentric and eccentric strength tend to be parallel. LSB has proposed a long term initiative, "BLSA Initiative on Age-associated Changes in Functional Ability (Frailty)." The initiative consists of three projects: 1) to develop a quantitative functional assessment for the BLSA; 2) to investigate how changing vision effects performance; and, 3) a protocol is currently being developed to estimate the role of age associated changes in the peripheral nerve on the age associated changes in muscle strength. We plan to estimate the number of functional motor units and to follow longitudinal changes in strength and unit count.