EFFECT OF DIFFERENT ELBOW ANGLES POSITIONS ON HAND GRIP STRENGTH AND MYOELECTRICAL ACTIVITY OF WRIST FLEXORS IN HEALTHY SUBJECTS
International Journal of Therapies and Rehabilitation Research
and purpose: Handgrip strength is an objective measure of muscular function in the upper extremity and has been used as a marker of frailty in adults. Muscle electromyography (EMG) is an indirect and non-invasive method to evaluate muscle function and activity and predict hand grip force. Subjects: Fifty normal male university students volunteered to participate in this study. They were selected from the students of Faculty of Physical Therapy, Cairo University. Those subjects were collected in
... one group. Procedures: Hand grip strength was assessed using Hand held dynamometer and Root mean square of wrist flexors was assessed by using Noraxon MyoSystem 1400A Instrument. Three dependent variables; Root mean square (RMS) of flexor carpi radials (FCR), RMS of flexor carpi ulnaris (FCU), and handgrip strength were measured and one independent variable which was the (elbow positions); within subject factor which had three levels (0° elbow flexion, 90° elbow flexion, and full elbow flexion). Results: For hand grip strength, RMS of FCR and RMS of FCU, the results showed that there was significant increase in the value of three values index in favor to 90° elbow flexion position than all other elbow flexion position. Conclusion: it was concluded that there were significant effects of the tested elbow positions (the independent variable) on the three tested dependent variables; RMS of flexor carpi radials,RMS of flexor carpi ulnaris, and handgrip strength (F=143.4, P=0.0001*).