Muscle-induced accelerations at maximum activation to assess individual muscle capacity during movement.
Muscle-induced accelerations at maximum activation to assess individual muscle capacity during movement.
复制标题
最大激活时肌肉引起的加速度，用于评估运动过程中的个体肌肉能力。
DOI：
10.1016/j.jbiomech.2009.01.007
复制
发表时间：
2009
影响因子：
2.4
通讯作者：
Kepple,ThomasM
中科院分区：
文献类型：
--
作者：
Goldberg,SarynR;Kepple,ThomasM
对肌肉诱导的加速的分析提供了对单个肌肉如何对运动做出贡献的洞察。在之前的研究中，研究人员在单位力量的基础上计算了肌肉诱导的加速度，以评估单个肌肉对运动做出贡献的潜力。然而，由于肌肉力量是肌肉激活、长度和缩短速度的函数，因此检查单位力量的诱导加速度时不考虑单个肌肉在运动过程中产生力量的能力如何变化。或者，计算肌肉在最大激活时的诱导加速度时，会考虑肌肉在运动过程中产生力量的程度，以及肌肉在每个瞬间由于其力矩臂(S)和系统的动力学而加速关节的潜力。我们计算了正常步态站立阶段活动的主要下肢肌肉的这两个量。我们发现，在某些情况下，分析最大激活时的诱导加速度会导致对肌肉潜在行为的不同解释，而不是分析单位力的诱导加速度。例如，按单位力量计算，臀大肌在单肢站立时有很大的加速膝关节的潜力，但由于这块肌肉在大多数站立时在力量-长度-速度曲线的次优区域工作，所以在最大限度地激活膝关节时只有很小的潜力加速膝关节。这种新的分析技术将有助于研究异常运动，当运动学改变时，可能会由于改变长度和缩短速度而影响肌肉加速关节的能力。
Analyses of muscle-induced accelerations provide insight into how individual muscles contribute to motion. In previous studies, investigators have calculated muscle-induced accelerations on a per unit force basis to assess the potential of individual muscles to contribute to motion. However, because muscle force is a function of muscle activation, length, and shortening velocity, examining induced accelerations per unit force does not take into account how the capacity of individual muscles to produce force changes during movement. Alternatively, calculating a muscle's induced accelerations at maximum activation considers the extent to which the muscle can produce force during movement, as well as the potential of the muscle to accelerate the joints at each instant due to its moment arm (s) and the dynamics of the system. We computed both quantities for the major lower extremity muscles active during the stance phase of normal gait. We found that analyzing the induced accelerations at maximum activation in some cases led to a different interpretation of the muscles’ potential actions than analyzing the induced accelerations per unit force. For example, per unit force, gluteus maximus has a very large potential to accelerate the knee during single limb stance, but only a small potential to accelerate the knee at maximum activation due to this muscle operating in suboptimal regions of its force–length–velocity curve during the majority of stance. This new analysis technique will be useful in studying abnormal movement, when altered kinematics may influence the capacity of muscles to accelerate joints due to altered lengths and shortening velocities.
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运动和运动科学评论
DOI：
--
发表时间：
1990
期刊：
影响因子：
--
作者：
S. Hyman
通讯作者：
S. Hyman
影响因子：
2.4
作者：
Kimmel, SA;Schwartz, MH
通讯作者：
Schwartz, MH
影响因子：
2.4
作者：
Anderson, FC;Pandy, MG
通讯作者：
Pandy, MG
影响因子：
2.4
作者：
Neptune, RR;Kautz, SA;Zajac, FE
通讯作者：
Zajac, FE