Final answer:
The primary reason why the clinical benefits of EMG biofeedback are not substantiated in the literature is likely due to methodological differences. It is important for future research to address these methodological issues and establish more standardized protocols.
Step-by-step explanation:
The primary reason why the clinical benefits of EMG biofeedback are not substantiated in the literature is likely due to methodological differences. In research studies, it is important to have consistent and standardized methods in order to ensure reliable and valid results. When it comes to EMG biofeedback, there may be variations in the way the technique is administered, the duration of treatment, the sample size, and other factors.
These methodological differences can make it difficult to compare and generalize the findings across different studies. It is important for future research to address these methodological issues and establish more standardized protocols in order to better evaluate the clinical benefits of EMG biofeedback.