INDIVIDUAL JOINT MOMENT STRATEGIES UTILIZED DURING THE SUPPORT PHASE OF RUNNING

Abstract

Typically ground reaction force parameters have been used to determine individual kinetic strategies for accommodating impact and loading forces incurred during running. Joint moments are also useful indicators of the amount of physical stress placed on the neuromuscular system (Winter, 1983). General patterns ofjoint moments (MJ) during the support period can be identified, although considerable pattern variability is evident between the subjects and between the different studies (Winter, 1983; Mann, 1980; Elftman, 1940). The patterns and magnitudes appear to be influenced by skill level (Mann, 1980) and running speed (Winter, 1983; Mann, 1980). Inter-subject variability is joint dependent. Winter (1983) reported increased inter-subject JM variability from the ankle to the hip joint. Differences among subjects and studies could be due partially to the individual strategies used for accommodating impact forces and for generating propulsive forces. Therefore, the purpose of the study was to identify inter-subject differences among the lower extremity joint moments to gain a better understanding of the adaptation strategies utilized during the support period.