Does muscular weakness account for younger children's enhanced force variability?
Does muscular weakness account for younger children's enhanced force variability?
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肌肉无力是否是年幼儿童力量变异性增强的原因？
DOI：
10.1002/dev.20209
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发表时间：
2007
影响因子：
2.2
通讯作者：
Newell,KarlM
中科院分区：
文献类型：
--
作者：
Sosnoff,JacobJ;Deutsch,KatherineM;Newell,KarlM
这项研究探讨了在何种程度上更小的儿童的力量控制的变异性与肌肉无力。6岁、8岁和10岁的儿童以及18-22岁的成人通过食指后掌指关节屈曲产生等长力，达到不同的力水平（5%、15%、25%和35%最大自主收缩）。在所有力量水平上，与成人相比，年幼儿童的力量输出更具可变性，并且具有更大的时间依赖结构。然而，年龄对变异性的影响显着减少，但没有消除时，绝对肌肉力量被考虑在内。得出的结论是，儿童力量控制的年龄相关变化是由多种发育过程引起的，包括肌肉力量的增加。© 2007 Wiley Periodicals，Inc. Dev Psychobiol 49：399-405，2007.
This study examined the degree to which younger children's greater variability in force control is associated with muscular weakness. Children aged 6, 8, and 10 years and adults aged 18–22 years produced isometric force via index finger metacaro‐phalangeal joint flexion to varying force levels (5%, 15%, 25%, and 35% maximal voluntary contraction). The force output of the younger children was more variable and had greater time dependent structure compared to that of the adults at all force levels. However, the effect of age on variability was significantly reduced, but not eliminated when absolute muscular strength was taken into account. It is concluded that age‐related changes in children's force control result from a multitude of developmental processes including increases in muscular strength. © 2007 Wiley Periodicals, Inc. Dev Psychobiol 49: 399–405, 2007.