Rehabilitation therapy often relies on subjective assessments of exertion and fatigue, lacking objective metrics to guide treatment. This thesis explores surface electromyography (sEMG) as a tool for force estimation and fatigue detection in hand rehabilitation. Eight sEMG sensors were placed on key flexor and extensor muscles. Voluntary force was measured using a grip strength dynamometer for maximal force and a numeric dynamometer for continuous estimation, while fatigue was classified from sEMG features. Distinct muscle contributions were observed at different force levels, with clear...