Defense Date


Document Type


Degree Name

Master of Science


Health Related Sciences

First Advisor

Otto Payton


This study was undertaken in order to investigate the effect of different feedback variables on isometric strength performance. The variables studied were auditory EMG biofeedback, knowledge of results, and verbal cues.

Nineteen normal adult women volunteered as subjects for the study. Each subject performed nine isometric contractions of the triceps brachii muscle against the resistance of a cable tensiometer. One of three different types of feedback was given during each contraction in order to motivate subjects to generate as much force as possible. Feedback variables were applied in random order; each variable was used three times. Peak force readings were recorded from the cable tensiometer at the end of each trial.

Force readings were converted into pounds by matching than to a calibration curve. The actual force values underwent analysis of variance to determine if one type of feedback variable was more effective in motivating subjects to put forth a maximum effort during isometric muscle contraction. Results showed that the type of variable used during task performance had no differing effect on the amount of tension generated. Thus, the null hypothesis that the application of either EMG biofeedback, knowledge of results, or verbal cueing has no "differing effect on the amount of force that is exerted during isometric contraction of the triceps brachii muscle could not be rejected.


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