Document Type

Student Presentation

Presentation Date



College of Health Sciences


Department of Kinesiology

Faculty Sponsor

Dr. Tyler Brown


Neuromuscular fatigue decreases performance and increases injury risk, but practitioners lack an easy, reliable method for detecting fatigue. This study determined if ground reaction forces are impacted by neuromuscular fatigue and whether this differed between limbs. Thirty-one female athletes (19.1 ± 1.22 years, 1.7 ± 0.6 m and 63.0 ± 7.7 kg) participated. Each participant had vertical ground reaction force (vGRF) recorded during five trials of a forward jump task immediately prior to and following a competitive soccer season. During each trial, peak vGRF during landing for both dominant and non-dominant limbs and asymmetry of peak vGRF between limbs were calculated. These measures were submitted to a RM ANOVA to test the main effect and interaction between time (pre vs. post) and fatigue (starter vs. non-starter). A significant two-way interaction for dominant limb peak vGRF (p=0.034) was observed. Starters increased peak vGRF (p=0.049) at post compared to pre time point, but no difference was evident for non-starters (p=0.333). Asymmetry of vGRF (p=0.033) between limbs decreased at the post-season time point, but asymmetry did not differ between starters and non-starters (p=0.360). Ground reaction force data may be an easy, reliable for detecting neuromuscular fatigue.