Effect of Ageing on Isometric Strength through Joint Range at Knee and Hip Joints in Three Age Groups of Older Adults
Effect of Ageing on Isometric Strength through Joint Range at Knee and Hip Joints in Three Age Groups of Older Adults
复制标题
衰老对三个年龄段老年人膝关节和髋关节关节范围等长肌力的影响
作者：
D. Samuel;P. Rowe
背景：下肢肌肉的力量是基于运动的功能活动的重要决定因素。随着年龄的增长，力量的丧失导致日常生活活动的功能限制，例如从椅子上站起来或爬楼梯。然而，关于年龄相关变化对肌肉通过关节运动范围产生扭矩能力的影响的信息有限。目的：研究年龄对三个年龄组大样本老年人下肢肌肉扭矩产生能力的影响。研究方法：82名志愿者参加了这项研究，并根据他们的实际年龄（60岁，70岁和80岁及以上）和性别（男性，女性）分为六组。使用定制的应变仪扭矩测力计和专用底座在关节范围内的三个位置测量膝关节和髋关节的等长肌力。结果如下：膝关节和髋关节的主要肌肉群的峰值扭矩随着年龄的增长而下降，在所有的三个关节位置，在强度测试。80岁的人，力量比60岁的人低20%。80岁组与60岁组相比，肌肉力量下降显著（p < 0.05）。与中间位置（中间位置）相比，肌肉活动的内部（肌肉从中间位置缩短）和外部（肌肉从中间位置延长）范围的力量损失更高。基于性别的差异对于所有强度测试都是显著的（p < 0.05）。结论：膝、髋关节在关节活动范围内各部位的力量随年龄增长而下降。然而，肌肉力量的损失百分比在关节范围内的不同位置是不同的。我们的研究结果表明，肌肉力量在肌肉功能的中间范围比肌肉动作的内部和外部范围更能保持。在老年人中，下肢肌肉可能需要在关节位置产生更高的力矩，这些关节位置不在肌肉动作的最佳中间位置内。
Background: Strength of lower extremity muscles is an important determinant of mobility-based functional activities. Loss of strength with age produces functional limitation in activities of daily living such as rising from a chair or stair negotiation. However, there is limited information on the effect of age-related changes on the torque-producing ability of muscles through their ranges of joint motion. Objective: To investigate the effect of ageing on the torque-producing ability of lower extremity muscles in a large sample of older adults in three age groups. Methods: Eighty-two volunteers participated in this study and were divided into six groups according to their chronological age (60s, 70s and 80s and above) and gender (male, female). Isometric muscle strength was measured at the knee and hip joints at three positions through the joint range using a custom-built strain gauge torque dynamometer and a purpose built plinth. Results: The peak torque of major muscle groups of the knee and hip joints decreased with increasing age at all the three joint positions at which strength was tested. The 80-year-olds had 20% lower strength compared to the 60-year-olds. Age-related decrease in muscle strength was significant when comparing 80-year-olds with the 60-year-olds (p < 0.05). Strength loss was noted to be higher at the inner (muscle is shortened from mid-position) and outer (muscle is lengthened from mid-position) ranges of muscle action when compared with the mid-range position (mid-position). Gender-based differences were significant for all the strength tests (p < 0.05). Conclusions: Strength decreased with increasing age at all the positions within joint range of motion for knee and hip joints. However, the percentage loss of muscle strength was different at different positions in the joint range. Our findings suggest that muscle strength was more preserved in the middle range of muscle function compared to the inner and outer range of muscle action. In older people, lower extremity muscles might be required to produce higher moments in joint positions that are not within the optimum mid-position for muscle action.
影响因子：
4.2
作者：
Cahalan,TD;Johnson,ME;Liu,S;Chao,EY
通讯作者：
Chao,EY