Date of Award


Degree Name

Master of Science


Occupational Therapy

First Advisor

Dr. Barbara A. Rider

Second Advisor

Dr. Mary Ann Bush

Access Setting

Masters Thesis-Open Access


This study reports the relationship between electrical output of the deltoid muscle and the pectoral is major muscle (clavicular portion) ipsilaterally, following maximal resistance to grasp of the non-dominant hand while in the prone-on-elbows position. Forty-two normal college students were recruited from Western Michigan University, Kalamazoo, and were randomly assigned to experimental and control groups. The experimental subjects' shoulder muscles' electrical activity was measured for changes from baseline to maximal contraction during two trials. The control group was measured in the same manner but they were not asked to contract their hand against resistance. For both groups electrical activity was monitored by electromyographs. The results showed a statistically significant increase of the electrical activity from baseline for the deltoid muscle and pectoral is major muscle ipsilaterally during maximal resistance to grasp of the non-dominant hand while lying in the prone-on-elbows position, rejecting the null hypothesis.