We have studied the activation patterns of muscles in unimpaired subjects and in subjects with movement abnormalities, before and after surgery. Typically, these studies are done by securing the limb to a load cell, asking subjects to match target loads displayed on a computer monitor, and recording the subject's electromyographic activity.

Thelen, Riewald, Asakawa, Sanger, and Delp. "Abnormal Coupling of Knee and Hip Moments during Maximal Exertions in Person with Cerebral Palsy." Muscle & Nerve, 2003. (Download PDF)

Vasavada, Peterson, and Delp. "Three-dimensional spatial tuning of neck muscle activation in humans." Experimental Brain Research, 2002. (Download PDF)