Rutherford Derek, Baker Matthew, Wong Ivan, Stanish William
School of Physiotherapy, Faculty of Health Professions, Dalhousie University, Halifax, NS, Canada; School of Biomedical Engineering, Faculty of Engineering, Dalhousie University, Halifax, NS, Canada.
School of Physiotherapy, Faculty of Health Professions, Dalhousie University, Halifax, NS, Canada.
Clin Biomech (Bristol). 2017 Jun;45:25-31. doi: 10.1016/j.clinbiomech.2017.04.006. Epub 2017 Apr 23.
Effect of treadmill familiarization on knee function in osteoarthritis is not clear. Purpose was to determine whether spatiotemporal characteristics, knee joint biomechanics and muscle activation patterns change as individuals with and without medial compartment knee osteoarthritis familiarize to dual-belt treadmill walking over 6min.
20 individuals with knee osteoarthritis and 20 asymptomatic controls walked at a self-selected speed. Spatiotemporal characteristics, sagittal plane joint motions, sagittal and frontal plane moments and knee joint muscle activation patterns, amplitude normalized to maximum isometric contractions were analyzed. Discrete measures were extracted from each biomechanical waveform and principal component analysis was used to determine knee joint muscle activation patterns. Statistical significance was determined using Analysis of Variance models (alpha=0.05).
Spatiotemporal gait characteristics, knee motion and moment differences were found between groups however no group by time interactions existed and no changes in these variables were found over 6min of walking. Group differences in muscle activation patterns were found in all muscle activations. Muscle activation amplitude and patterns at minute 5 and 6 were generally lower, less prolonged and more dynamic when compared to minute 1 and 3.
Individuals with and without medial compartment knee osteoarthritis familiarized to treadmill walking in a similar manner. Minimal changes to knee biomechanics were found during treadmill familiarization. Five to six minutes of familiarization should be considered for surface electromyography in these populations.
跑步机适应性训练对骨关节炎患者膝关节功能的影响尚不清楚。目的是确定有和没有内侧间室膝关节骨关节炎的个体在6分钟内适应双带跑步机行走时，时空特征、膝关节生物力学和肌肉激活模式是否会发生变化。
20名膝关节骨关节炎患者和20名无症状对照者以自选速度行走。分析时空特征、矢状面关节运动、矢状面和额状面力矩以及膝关节肌肉激活模式，将其幅度归一化至最大等长收缩。从每个生物力学波形中提取离散测量值，并使用主成分分析来确定膝关节肌肉激活模式。使用方差分析模型确定统计学显著性（α=0.05）。
两组之间发现了时空步态特征、膝关节运动和力矩差异，但不存在组间与时间的交互作用，且在6分钟的行走过程中未发现这些变量有变化。在所有肌肉激活中均发现了肌肉激活模式的组间差异。与第1分钟和第3分钟相比，第5分钟和第6分钟时肌肉激活幅度和模式通常更低、持续时间更短且更具动态性。
有和没有内侧间室膝关节骨关节炎的个体以相似的方式适应跑步机行走。在跑步机适应过程中，膝关节生物力学变化极小。对于这些人群的表面肌电图检查，应考虑进行5至6分钟的适应训练。
