Relationship between ankle plantar flexor force steadiness and postural stability on stable and unstable platforms
Relationship between ankle plantar flexor force steadiness and postural stability on stable and unstable platforms
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DOI：
10.1007/s00421-020-04346-0
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发表时间：
2020-05-01
影响因子：
3
通讯作者：
Ichihashi, Noriaki
中科院分区：
文献类型：
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作者：
Hirono, Tetsuya;Ikezoe, Tome;Ichihashi, Noriaki
目的探讨在稳定和不稳定平台上单腿站立时足底屈肌力稳定性与姿势控制的关系。方法对33名健康受试者，在踝关节跖屈肌最大自主扭矩（MVT）的5%、20%和50%的目标扭矩下，测量力的稳定性。力稳定性计算为力的变化系数。单腿站立在稳定和不稳定的平台上，使用BIODEX Balance System SD。测量前后压力中心（COP）位移的标准差作为姿势控制的指标。在这两种测量中，使用表面肌电图收集比目鱼肌的肌肉活动。结果在稳定平台上，在MVT的5%时，COP波动与力稳定性显著相关（r = 0.512, p = 0.002）。在不稳定平台上，在MVT的20%处，COP波动与力稳定性显著相关（r = 0.458, p = 0.007）。然而，单腿站立在稳定和不稳定平台上观察到的肌肉活动程度明显大于分别在5%和20% MVT时执行力稳定任务时观察到的肌肉活动。结论在稳定和不稳定平台上单腿站立时的姿势稳定性可能与一个人在MVT的5%和20%时保持恒定扭矩的能力有关，而与肌肉活动无关。这些结果表明，控制肌肉力量所需的能力取决于姿势控制任务。
Purpose This study was aimed at determining the relationship between ankle plantar flexor force steadiness and postural control during single leg standing on stable and unstable platforms. Methods For the thirty-three healthy participants, force steadiness, at target torques of 5%, 20%, and 50% of the maximum voluntary torque (MVT) of the ankle plantar flexors, was measured. Force steadiness was calculated as the coefficient of variation of force. Single leg standing on stable and unstable platforms was performed using the BIODEX Balance System SD. The standard deviation of the anteroposterior center of pressure (COP) displacements was measured as the index for postural control. During both measurements, muscle activities of the soleus were collected using surface electromyography. Results On the stable platform, the COP fluctuation significantly correlated with force steadiness at 5% of MVT (r = 0.512, p = 0.002). On the unstable platform, the COP fluctuation significantly correlated with force steadiness at 20% of MVT (r = 0.458, p = 0.007). However, the extent of muscle activity observed for a single leg standing on both stable and unstable platforms was significantly greater than the muscle activity observed while performing force steadiness tasks at 5% and 20% of MVT, respectively. Conclusion Postural stability during single leg standing on stable and unstable platforms may be related to one's ability to maintain constant torque at 5% and 20% of MVT regardless of the muscle activity. These results suggest that the required abilities to control muscle force differ depending on the postural control tasks.