Children have a reduced maximal voluntary activation level of the adductor pollicis muscle compared to adults

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• 作者：V. Martin ; V. Kluka ; S. Garcia Vicencio ; F. Maso…
• 关键词：Magnetic stimulation ; Motor nerve ; Strength ; Maturation ; Age ; Central nervous system
• 刊名：European Journal of Applied Physiology
• 出版年：2015
• 出版时间：July 2015
• 年：2015
• 卷：115
• 期：7
• 页码：1485-1491
• 全文大小：545 KB
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• 作者单位：V. Martin (1)
  V. Kluka (1)
  S. Garcia Vicencio (1)
  F. Maso (2)
  S. Ratel (1)
  
  1. Université Clermont Auvergne, Université Blaise Pascal, Laboratoire des Adaptations Métaboliques à l’Exercice en Conditions Physiologiques et Pathologiques (AME2P, EA 3533), BP 10448, 63000, Clermont-Ferrand, France
  2. Centre de formation, ASM Rugby, Clermont-Ferrand, France
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Biomedicine
  Human Physiology
  Occupational and Industrial Medicine
  Sports Medicine
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1439-6327

文摘

Purpose The role of nervous factors in the muscle strength difference between children and adults is debated, and the level of physical activity may confound this comparison. The purpose of this study was thus to compare, between children and adults, the maximal voluntary activation level (MVA) of the adductor pollicis (AP) muscle, which is weakly influenced by the level of physical activity. Methods Thirteen boys (11.6?±?0.1?years) and eight men (25.6?±?1.5?years) were involved in this study. Neuromuscular function assessment included the evaluation of maximal voluntary contraction (MVC) force and of the MVA from peripheral magnetic stimulations of the ulnar nerve. The cross-sectional area of the AP muscle was determined with ultrasonography and used to calculate the specific force. A theoretical value of specific force, extrapolated for a full MVA, was finally computed (specific force@100?%?MVA). Results MVC force (66.8?±?6.2 vs. 111.0?±?4.5?N, respectively; P?<?0.001) and MVA (85.0?±?2.7 vs. 94.8?±?1.4?%, respectively; P?<?0.05) were significantly lower in children compared to adults. The specific force was lower in children compared to adults (46.8?±?3.6 vs. 56.9?±?2.5?N/cm2, respectively; P?<?0.05), but the specific force@100?%?MVA did not differ between groups. Conclusion The results suggest that on an untrained muscle such as the AP muscle, the reduced ability of children to voluntarily activate their muscle could partly account for the difference of muscle strength between children and adults.