Parijat Prakriti, Lockhart Thurmon E
School of Biomedical Engineering and Sciences, Locomotion Research Lab, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061, USA.
Gait Posture. 2008 Nov;28(4):568-73. doi: 10.1016/j.gaitpost.2008.04.001. Epub 2008 Jun 2.
This study examines how lower extremity fatigue of the quadriceps alters gait variables related to slip propensity. Sixteen healthy young adults were recruited to walk across vinyl floor surfaces in states of fatigue and no fatigue. Kinematic and kinetic data were collected using a three-dimensional motion analysis system and force plates. The results indicated a significant increase in both the heel contact velocity and required coefficient of friction and a decrease in the transitional acceleration of the whole body center of mass and peak knee joint moment in the fatigue trials. Thus, suggesting that slip propensity could increase with fatigue. Additionally, there was increased knee flexion and reduced ankle dorsiflexion at the heel contact phase of the gait cycle during fatigue trials. These findings provide new insights into the biomechanical relationship between localized muscle fatigue and gait parameters associated with slip propensity. The present study concluded that localized muscle fatigue affects gait parameters and hence can be considered as a potential risk factor for slip-induced falls.
本研究考察了股四头肌的下肢疲劳如何改变与滑倒倾向相关的步态变量。招募了16名健康的年轻成年人，让他们在疲劳和无疲劳状态下走过乙烯基地板表面。使用三维运动分析系统和测力板收集运动学和动力学数据。结果表明，在疲劳试验中，脚跟接触速度和所需摩擦系数均显著增加，全身质心的过渡加速度和膝关节峰值力矩减小。因此，表明滑倒倾向可能会随着疲劳而增加。此外，在疲劳试验中，步态周期的脚跟接触阶段膝关节屈曲增加，踝关节背屈减少。这些发现为局部肌肉疲劳与与滑倒倾向相关的步态参数之间的生物力学关系提供了新的见解。本研究得出结论，局部肌肉疲劳会影响步态参数，因此可被视为滑倒所致跌倒的潜在风险因素。
