Muscle volume compared to cross-sectional area is more appropriate for evaluating muscle strength in young and elderly individuals
Muscle volume compared to cross-sectional area is more appropriate for evaluating muscle strength in young and elderly individuals
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DOI：
10.1093/ageing/afp122
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发表时间：
2009-09-01
期刊：
影响因子：
6.7
通讯作者：
Fukunaga, Tetsuo
中科院分区：
文献类型：
--
作者：
Akagi, Ryota;Takai, Yohei;Fukunaga, Tetsuo
方法：研究对象为 52 名青年（20-34 岁；男性 30 名，女性 22 名）和 51 名老年人（60-77 岁，男性 19 名，女性 32 名）。通过磁共振成像确定肘屈肌的 MV 和最大解剖 CSA (ACSA)。将等长肘关节屈曲的最大自主收缩过程中产生的扭矩除以每个受试者的前臂长度即可转换为力。结果：在年轻人和老年人中，扭矩与 MV 显着相关（r = 0.564-0.926）。同样，力也与每个人的 ACSA 显着相关（r = 0.637-0.906）。然而，年轻男性和女性中 ACSA-力关系回归线的 y 截距显着高于零。年龄对每 MV 的扭矩没有影响，而每 ACSA 的力在年轻人中显着高于老年人。结论：对于肘屈肌，MV 与 ACSA 相比适合评估尺寸-力量关系以及每尺寸肌肉力量是否存在与年龄相关的差异。
Methods: the subjects were 52 young (20-34 year; 30 men and 22 women) and 51 elderly individuals (60-77 year, 19 men and 32 women). The MV and maximal anatomical CSA (ACSA) of elbow flexors were determined by magnetic resonance imaging. The torque developed during maximal voluntary contraction of isometric elbow joint flexion was converted to force by dividing it by the forearm length of each subject.Results: torque was significantly correlated with MV in young and elderly individuals (r = 0.564-0.926). Similarly, force was also significantly correlated with ACSA in each of them (r = 0.637-0.906). However, the y-intercepts of the regression lines for the ACSA-force relationship in young men and women were significantly higher than zero. There was no age effect on torque per MV, whereas force per ACSA was significantly higher in young adults than in elderly individuals.Conclusion: for elbow flexors, MV compared to ACSA is appropriate for evaluating the size-strength relationship and the existence of age-related difference in muscle strength per size.