Lyytinen T, Bragge T, Hakkarainen M, Liikavainio T, Karjalainen P A, Arokoski J P
Department of Physical and Rehabilitation Medicine, Kuopio University Hospital, Kuopio, Finland.
J Musculoskelet Neuronal Interact. 2016 Mar;16(1):63-74.
To determine the repeatability of knee joint impulsive loading measurements with skin-mounted accelerometers (SMAs) and lower limb surface electromyography (EMG) recordings during gait.
Triaxial SMA and EMG from 4 muscles during level and stair walking in nine healthy and nine knee osteoarthritis (OA) subjects were used. The initial peak acceleration (IPA), root mean square (RMS), maximal acceleration transient rate (ATRmax) and mean EMG activity (EMGact) were calculated. The coefficient of variation (CV) and the intraclass correlation coefficient (ICC) were calculated to measure repeatability.
The CV and ICC of RMS accelerations ranged from 4.9% to 10.9% and from 0.69 to 0.96 in both study groups during level walking. The CV and ICC of IPA and ATRmax varied from 7.7% to 14.2% and from 0.85 to 0.99 during level and stairs up walking in healthy subjects. The CV and ICC of EMGact ranged from 8.3% to 31.7% and from 0.16 to 0.97 in both study groups.
RMS accelerations exhibited good repeatability during walking in healthy and knee OA subjects. The repeatability of EMG measurements was acceptable in healthy subjects depending on the measured muscles.
确定在步态过程中使用皮肤表面加速度计（SMA）和下肢表面肌电图（EMG）记录膝关节脉冲负荷测量的可重复性。
使用来自9名健康受试者和9名膝关节骨关节炎（OA）受试者在平地行走和上楼梯时4块肌肉的三轴SMA和EMG数据。计算初始峰值加速度（IPA）、均方根（RMS）、最大加速度瞬变率（ATRmax）和平均肌电活动（EMGact）。计算变异系数（CV）和组内相关系数（ICC）以测量可重复性。
在平地行走时，两个研究组中RMS加速度的CV和ICC范围分别为4.9%至10.9%和0.69至0.96。在健康受试者平地行走和上楼梯时，IPA和ATRmax的CV和ICC范围分别为7.7%至14.2%和0.85至0.99。两个研究组中EMGact的CV和ICC范围分别为8.3%至31.7%和0.16至0.97。
在健康受试者和膝关节OA受试者行走过程中，RMS加速度表现出良好的可重复性。在健康受试者中，根据所测量的肌肉，EMG测量的可重复性是可以接受的。
