As muscle fatigue increases, EMG signal frequency increases while hand grip strength decreases, indicating higher muscle activation at lower frequencies.

During muscle fatigue, EMG signal frequency increases and hand grip strength remains unchanged, indicating consistent muscle activation levels.

With increasing muscle fatigue, EMG signal frequency decreases, and hand grip strength also decreases, reflecting reduced muscle activation and recruitment.

Muscle fatigue causes EMG signal frequency to remain stable, while hand grip strength increases, suggesting improved efficiency in muscle activation.