Comparison of maximal muscle strength of elbow flexors and knee extensors between younger and older men with the same level of daily activity.
Comparison of maximal muscle strength of elbow flexors and knee extensors between younger and older men with the same level of daily activity.
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DOI：
10.2147/cia.s41838
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发表时间：
2013
影响因子：
3.6
通讯作者：
Chacon-Mikahil MP
中科院分区：
文献类型：
--
作者：
Nogueira FR;Libardi CA;Vechin FC;Lixandrão ME;de Barros Berton RP;de Souza TM;Conceição MS;Cavaglieri CR;Chacon-Mikahil MP
衰老促进神经肌肉损失，显著降低肌肉力量。肢体之间的力量损失程度似乎不同，可能是因为日常生活活动（ADL）的差异。因此，本研究比较了ADL水平匹配的年轻（n = 7，平均年龄23.3 ± 1.2岁）和老年（n = 5，平均年龄61.8 ± 2.6岁）男性的手肘屈肌和膝伸肌的肌肉力量。研究参与者使用等速测力计进行交叉研究设计后，手肘屈肌和膝伸肌的最大同心、等距和离心收缩。使用混合模型分析（肢体与年龄）比较因变量的变化。主要结果表明，膝伸肌的向心、离心和平均收缩力矩，年轻男性显著高于老年男性（P < 0.05）。另一方面，年轻人和老年人之间肘屈肌的向心、等长、离心和平均扭矩无统计学差异（P > 0.05）。这些结果表明，肘屈肌保持更好的力量比膝伸肌通过老化，即使在比较具有相似的ADL水平的个人。
Aging promotes neuromuscular loss, significantly reducing muscle strength. The magnitude of loss of strength seems to be different between the limbs, probably because of differences in activities of daily living (ADL). Therefore, the present study compared the muscle strength of the elbow flexors and knee extensors in younger (n = 7, mean age 23.3 ± 1.2 years) and older (n = 5, mean age 61.8 ± 2.6 years) men matched by ADL level. The study participants performed maximal concentric, isometric, and eccentric contractions of the elbow flexors and knee extensors using an isokinetic dynamometer following a crossover study design. Changes in the dependent variables were compared using mixed model analysis (limb versus age). The main results demonstrated that concentric, eccentric, and mean contraction torques for knee extensors were significantly (P < 0.05) higher for younger men than for elderly men. On the other hand, no statistically significant difference (P > 0.05) was found in concentric, isometric, eccentric, and mean torques for elbow flexors between younger and older individuals. These results show that elbow flexors maintain better strength than knee extensors through aging, even when comparing individuals with similar ADL levels.