Limitations of the study
First, the sample size in this study was relatively small. Second, it is unclear whether the frequency, intensity, and duration of NME by the motorized device were the best in this study, and there is no previous study to compare it with. Third, only the VAS score and AROM of the shoulder were measured in this study, and no disability questionnaires were reported. Finally, no long-term effect of NME was observed at FS. Therefore, further studies with a larger sample and different frequencies, intensities, and durations on long-term and functional effects are desirable.