Older adults exhibit a reduced ability to fully activate their biceps brachii muscle.
Older adults exhibit a reduced ability to fully activate their biceps brachii muscle.
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老年人充分激活肱二头肌的能力下降。
DOI：
10.1093/gerona/54.5.m249
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
Sahgal,V
中科院分区：
文献类型：
--
作者：
Yue,GH;Ranganathan,VK;Siemionow,V;Liu,JZ;Sahgal,V
背景：自愿性肌肉力量在老年人中显著下降。导致力量丧失的一个因素是老年时出现的肌肉萎缩。然而，最大限度地激活肌肉的能力是否会随着年龄的增长而降低，目前尚不清楚。这项研究旨在确定中枢神经系统最大限度地激活二头肌的指令是否随着年龄的增长而恶化。方法：在最大的自愿屈肘收缩期间，对二头肌上的皮肤施加电刺激脉冲。结果老年组肌肉的激活程度为94%，青年组为97%(100%为完全激活)。老年组和青年组的AL均显著低于100%(P<；0.05)。老年组AL显著低于青年组(P<；0.05)。结论：老年人自主力量的丧失是肌肉萎缩和充分激活肌肉能力降低的混合结果。
Background.Voluntary muscle strength declines significantly in older adults. One contributing factor to the strength loss is muscle atrophy developed in old age. Whether the ability to maximally activate the muscle decreases with age, however, is unknown. This study was intended to determine if the central nervous system command to maximally activate the biceps brachii muscle deteriorates with age.Methods.Electrical stimulation pulses were applied to the skin overlying the biceps brachii muscle during maximal voluntary elbow-flexion contractions. The magnitude of force evoked on the maximal voluntary force was measured to determine the activation level (AL) of the muscle.Results.The AL was 94% for the elderly group and 97% for the young group (100% AL indicates complete activation). The AL for both the elderly and young groups was significantly (p< .05) lower than 100%. The AL of the elderly group was significantly (p< .05) lower than that of the young group.Conclusions.The loss of voluntary strength in older adults is a mixed result of muscle atrophy and a reduced ability to fully activate muscle.