Stevens Jennifer E, Stackhouse Scott K, Binder-Macleod Stuart A, Snyder-Mackler Lynn
Department of Physical Therapy, Room 301 McKinly Laboratory, University of Delaware, Newark, Delaware 19716, USA.
Muscle Nerve. 2003 Jan;27(1):99-101. doi: 10.1002/mus.10279.
The relationship between the central activation ratio (CAR) and contraction force is curvilinear, not linear as was previously believed. Voluntary quadriceps femoris muscle activation from previously collected data sets in 46 older adults (64-84 years) and 46 young adults (18-32 years) were therefore reexamined using a curvilinear model of the voluntary muscle activation-percent maximum voluntary force relationship. This method revealed lower voluntary muscle activation in older adults (0.868 +/- 0.018) than younger subjects (0.978 +/- 0.005). The mean difference between older and younger adults was 11%, which may be more meaningful than previous reports of 2-4% because it could explain the greater rate of strength loss as compared to loss of muscle mass as humans age.
中枢激活率（CAR）与收缩力之间的关系是曲线关系，而非如先前认为的线性关系。因此，利用自愿肌肉激活与最大自愿力量关系的曲线模型，对先前收集的46名老年人（64 - 84岁）和46名年轻人（18 - 32岁）的股四头肌自愿激活数据集进行了重新审视。该方法显示，老年人的自愿肌肉激活程度（0.868±0.018）低于年轻人（0.978±0.005）。老年人与年轻人之间的平均差异为11%，这可能比先前2 - 4%的报告更具意义，因为它可以解释随着人类年龄增长，力量丧失速度比肌肉质量丧失速度更快的现象。
