Dallaway A, Hattersley J, Tallis J, Renshaw D, Griffen C, Duncan M
J Aging Phys Act. 2021 Apr 30;29(6):941-951. doi: 10.1123/japa.2020-0421.
This study investigated age-related changes in trunk muscle function in healthy men and the moderating effect of physical activity. Twelve older (67.3 ± 6.0 years) and 12 younger (24.7 ± 3.1 years) men performed isokinetic trunk flexion and extension tests across a range of angular velocities (15°/s-180°/s) and contractile modes (concentric and eccentric). For concentric trunk extension, mixed-effects analysis of covariance revealed a significant interaction between Angular velocity × Age group (p = .026) controlling for physical activity. Follow-up univariate analysis of covariance revealed that the younger group produced significantly greater peak torque for all concentric extension conditions. Eccentric trunk strength was somewhat preserved in the older group. Age-related changes in trunk strength were independent of physical activity. The normal loss of trunk muscle strength in older age is muscle- and contractile-mode specific. These findings provide guidance for effective intervention strategies to offset adverse health outcomes related to trunk strength loss in older adults.
本研究调查了健康男性躯干肌肉功能的年龄相关变化以及身体活动的调节作用。12名老年男性（67.3±6.0岁）和12名年轻男性（24.7±3.1岁）在一系列角速度（15°/秒 - 180°/秒）和收缩模式（向心和离心）下进行了等速躯干屈伸测试。对于向心躯干伸展，协方差混合效应分析显示，在控制身体活动的情况下，角速度×年龄组之间存在显著交互作用（p = 0.026）。后续的协方差单变量分析显示，在所有向心伸展条件下，年轻组产生的峰值扭矩显著更大。老年组的离心躯干力量有所保留。躯干力量的年龄相关变化与身体活动无关。老年时躯干肌肉力量的正常丧失具有肌肉和收缩模式特异性。这些发现为有效干预策略提供了指导，以抵消与老年人躯干力量丧失相关的不良健康后果。
