Date of Award

8-2022

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Kinesiology and Health Science

Committee Chair(s)

Talin Louder (Committee Chair) Anne Beethe (Committee Co-Chair)

Committee

Talin Louder

Committee

Anne Beethe

Committee

Chris Dakin

Abstract

PURPOSE: To investigate the role of vision during depth jump movements and further explore effects of stroboscopic goggles on the motor control of landing. METHODS: Ground reaction force (GRF), rate of force development (RFD), and lower limb surface electromyography measurements were collected on 20 participants (11 male 9 female) across 6 trials of depth jumping (0.51 m) in each of two visual conditions (full vision vs stroboscopic vision). Root-mean-square was estimated from EMG signals that were reduced to specific time-bins (150ms pre touchdown, 30-60ms, 60-85 ms, and 85-120 ms post touchdown). Main effects of and interactions between visual condition and trial number were assessed using repeated measures analysis of variance. RESULTS: Peak GRF was 6.4% greater in magnitude on average for DJs performed under condition of stroboscopic vision versus full vision (p = .042). There was a significant reduction in Tibialis Anterior activation during the 60-85ms medium latency response window, followed by a significant decrease in activation of the Vastus Lateralus during the 85-120 ms long latency response window. CONCLUSION: An influence of controlled visual disruption on depth jump movement performance was observed through altered landing mechanics and lower limb muscle activation patterns. This change presented as increased stiffness achieved before landing followed by larger peak ground reaction forces and subsequent altered muscular response post-landing.

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