Effect of maturation on the relationship between muscle size and force production
Effect of maturation on the relationship between muscle size and force production
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DOI：
10.1249/mss.0b013e3181641bed
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发表时间：
2008-05-01
期刊：
影响因子：
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通讯作者：
Bendahan, David
中科院分区：
文献类型：
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作者：
Tonson, Anne;Ratel, Sebastien;Bendahan, David
目的：虽然肌肉大小的增加与肌肉力量的增加有关，但肌肉大小与成熟过程中最大力量之间的关系仍在讨论中。在本研究中，我们的目的是确定成熟是否影响肌肉大小和最大力量之间的关系，我们调查的原因解释以前的研究之间的差异。研究方法：测量了14名青春期前男孩（11.3 ± 0.8岁）、16名青少年（13.3 ± 1.4岁）和16名男性（35.4 ± 6.4岁）的最大等长握力（F-max）和前臂肌肉尺寸。使用MRI测量解剖最大横截面积（MCSA）和肌肉体积（V-M），并将这些结果与人体测量获得的肌肉体积（V-L）进行比较。结果如下：F-max与V-M（r（2）= 0.90）、V-L（r（2）= 0.85）、MCSA（r（2）= 0.87）呈直线相关，而V-M与V-L（r（2）= 0.90）呈强相关。各组之间的F-max/V-M比值没有差异，而成人的F-max/V-L和F-max/MCSA比值显著高于儿童和青少年。这些结果表明，与MRI相比，人体测量导致系统性高估肌肉体积。儿童（43.1%）和青少年（38.5%）的高估率显著高于成人（20.5%）（P < 0.05）。结论：我们的研究结果表明，在人类前臂肌肉所施加的最大等长力量与他们的大小成正比，无论年龄，和V-M是最好的指标的肌肉大小在增长。先前报道的从儿童到成年产生最大力量的能力增加可以通过用于表征肌肉大小的方法而不是生理或神经变化所引入的系统偏差来解释。
Purpose: Although it is well accepted that an increase in muscle size is linked to an increase in muscle force, the relationship between muscle size and maximal strength during maturation is still discussed. In the present study we aimed at determining whether maturation affects the relationship between muscle size and maximal strength, and we investigated the reasons accounting for the discrepancies among previous studies. Methods: Maximal isometric handgrip force (F-max) and forearm muscle size were measured in 14 prepubertal boys (11.3 +/- 0.8 yr old), 16 adolescents (13.3 +/- 1.4 yr old), and 16 men (35.4 +/- 6.4 yr old). Anatomic maximal cross-sectional area (MCSA) and muscle volume (V-M) were measured using MRI, and these results were compared with muscle volume (V-L) obtained from anthropometric measurements. Results: F-max Was linearly correlated with V-M (r(2) = 0.90), V-L (r(2) = 0.85), and MCSA (r(2) = 0.87), while V-M was strongly correlated with V-L (r(2) = 0.90). The F-max/V-M ratio did not differ among groups, whereas F-max/V-L and F-max/MCSA ratios were significantly higher in adults than in children and adolescents. These results demonstrated that, when compared with MRI, anthropometric measurements led to a systematic overestimation of muscle volume. In addition, this overestimation was significantly larger in children (43.1%) and adolescents (38.5%) as compared with adults (20.5%) (P < 0.05). Conclusion: Our results showed that the maximal isometric strength exerted by the forearm muscles in humans is proportional to their size whatever the age, and that V-M is the best index of muscle size during growth. The previously reported increased ability to produce maximal strength from childhood to adulthood could be explained by systematic bias introduced by the method used to characterize muscle size instead of physiological or neural changes.