Thompson J M, Erickson R P, Offord K P
Physical Medicine and Rehabilitation, Mayo Clinic, Rochester, Minnesota 55905.
Biofeedback Self Regul. 1989 Mar;14(1):55-62. doi: 10.1007/BF00999340.
Electromyographic (EMG) muscle scanning measures 2-second samples of integrated muscle action potentials from individual neck and back muscles using a hand-held scanner with post-style surface electrodes separated by a fixed distance. This "scanning" technique is widely used to expeditiously assess muscle activity in the diagnosis of musculoskeletal disorders. In order to determine if the 2-second sample is sufficiently representative of electrical activity at a specific muscle site, the stability of the signal received by the hand-held scanner was measured bilaterally at six neck and back muscle sites over 40 seconds (20 2-second integration periods) in five seated subjects. Taking the overall average EMG activity as the "true" value, the mean number of 2-second integration periods required to achieve less than 5% standard error was calculated to be 1.47 for the 60 muscles tested. Only three sites required more than five integration periods. The validity of EMG scanning as a diagnostic tool is enhanced by longer integration periods.
肌电图（EMG）肌肉扫描使用手持式扫描仪，通过固定距离分开的后置式表面电极，测量来自颈部和背部各个肌肉的2秒积分肌肉动作电位样本。这种“扫描”技术广泛用于在肌肉骨骼疾病诊断中快速评估肌肉活动。为了确定2秒样本是否足以代表特定肌肉部位的电活动，在五名坐姿受试者的六个颈部和背部肌肉部位双侧测量手持式扫描仪接收到的信号在40秒（20个2秒积分期）内的稳定性。以总体平均肌电活动作为“真实”值，对于测试的60块肌肉，计算得出达到小于5%标准误差所需的2秒积分期的平均数量为1.47。只有三个部位需要超过五个积分期。更长的积分期可提高肌电图扫描作为诊断工具的有效性。
