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Tibial impact acceleration measured during running is known to increase with general body fatigue. The purpose of this study was to determine if localized muscle fatigue of the shank muscles would also cause an increase in peak tibial acceleration. The human pendulum system was used to control impact velocity and joint angle. There were 24 women participating in the study: 12 between the ages of 20--25, and 12 between 50--60 years. Each lay supine on the pendulum, and their unshod dominant heel was impacted into a vertical force plate with a velocity between 1--1.15 m/s, and a force approximating 1.8--2.8 x body weight. A uni-axial accelerometer at the tibial tubercle measured peak tibial acceleration, time to peak acceleration and the slope of the acceleration/time curve. EMG activity of the tibialis anterior and gastrocnemius was used to define and monitor fatigue. The dorsiflexors and plantarflexors were fatigued on two separate days, at least a week apart. Statistical analysis revealed a significant decrease in peak acceleration and acceleration slope following fatigue. There were no significant main effects or interactions for age group or muscle group. In conclusion, localized muscle fatigue of the dorsiflexors or plantarflexors resulted in a significant decrease in the peak acceleration and acceleration slope measured at the knee, which is opposite to the effect of general body fatigue. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis2003 .F59. Source: Masters Abstracts International, Volume: 42-03, page: 0986. Adviser: D. Andrews. Thesis (M.H.K.)--University of Windsor (Canada), 2003.
Flynn, Janice Marie., "The effect of localized muscle fatigue on tibial impact acceleration." (2003). Electronic Theses and Dissertations. 3886.