Walking speed does not affect net vastus lateralis fascicle length change on average during weight acceptance.
Walking speed does not affect net vastus lateralis fascicle length change on average during weight acceptance.
复制标题
步行速度不影响重量接受期间平均净股外侧肌束长度变化。
DOI：
10.1016/j.jbiomech.2022.111300
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发表时间：
2022
影响因子：
2.4
通讯作者：
Franz,JasonR
中科院分区：
文献类型：
--
作者：
Munsch,AmandaE;Pietrosimone,Brian;Franz,JasonR
更快的步行速度增加了对股四头肌的需求，以产生足够的力量来降低体重和控制膝关节屈曲。四头肌束行为（即，肌束长度变化）影响力的产生，力的产生又影响行走期间关节软骨的机械负荷和膝关节的生物化学环境。不同步行速度下的肌束行为尚不清楚，但应进行表征，以更好地了解股四头肌如何适应更快的步行速度，这种速度通常与更好的软骨健康结果相关。我们的目的是在肌肉活动和膝关节力矩变化的背景下，量化在一系列步行速度下接受体重时股四头肌净肌束长度的变化。我们假设，健康年轻人的股外侧肌（VL）束在早期站立时以更快的步行速度产生更多的整体延长力，伴随着肌肉-肌腱单位（MTU）延长、内部峰值膝伸肌力矩（pKEM）、垂直地面反作用力（GRF）和肌肉活动的增加。参与者以他们喜欢的速度和0.75 m/s和1.75 m/s行走两分钟。我们发现，平均而言，VL适应更大的机械需求，以更快的速度行走，更大的肌肉活动，同时抵抗肌肉延长行为。我们推断，肌腱拉伸适应MTU延长在健康的年轻人在一系列的速度，并建议这些结果激励额外的研究，旨在评估VL束行为的个人与已知的股四头肌力量不足，抑制，或发展骨关节炎的风险增加。
Faster walking speeds increase the demand on quadriceps muscles to produce adequate force to decelerate body mass and control knee flexion. Quadriceps fascicle behavior (i.e., fascicle length changes) influences force generation, which in turn affects mechanical loading of the articular cartilage during walking and the biochemical environment of the knee joint. The fascicle behavior underlying different walking speeds remains unclear but should be characterized to better understand how the quadriceps muscles accommodate faster walking speeds, speeds that often associate with better cartilage health outcomes. Our purpose was to quantify quadriceps muscle net fascicle length change during weight acceptance across a range of walking speeds in the context of more well-documented changes in muscle activity and knee joint moments. We hypothesized that vastus lateralis (VL) fascicles in healthy young adults would produce force with more overall lengthening in early stance at faster walking speeds with concomitant increases in muscle–tendon unit (MTU) lengthening, internal peak knee extensor moment (pKEM), vertical ground reaction force (GRF), and muscle activity. Participants walked for two-minute trials at their preferred speed and at 0.75 m/s and 1.75 m/s. We found that on average, the VL accommodates the greater mechanical demands of walking at faster speeds with greater muscle activity and while resisting muscle lengthening behavior. We infer then that tendon stretch accommodates MTU lengthening in healthy young adults across a range of speeds and suggest these results motivate additional studies aimed at evaluating VL fascicle behavior individuals with known quadriceps strength deficits, inhibition, or heightened risk for developing osteoarthritis.