Date of Award

4-2020

Degree Name

Master of Science

Department

Human Performance and Health Education

First Advisor

Dr. Sangwoo Lee

Second Advisor

Dr. Timothy Michael

Third Advisor

Dr. Nicholas Hanson

Keywords

Landing asymmetry, ground reaction force, vertical-jump, force production, take-off asymmetry

Access Setting

Masters Thesis-Open Access

Abstract

Significant asymmetries can exist between the lower limbs’ force production during the take-off phase of bilateral jumping exercises. Some studies have indicated that similar asymmetries can exist during the landing phase as well. It has not been demonstrated if the magnitude and/or direction of this imbalance is alike during the landing (L) and take-off (TO) phase of a jumping exercises. The main purpose of this study was to determine if there is a difference in the asymmetry that occurs during the L and TO phases. In order to quantify the degree and describe the direction (left. vs. right) of the occurring asymmetry, the vertical ground reaction force (vGRF) produced by each leg was measured during execution of vertical-jump (VJ), drop-jump (DJ), and drop-landing (DL) exercises. 11 recreationally trained individuals completed 3 VJ, DJ, and DL trials while two force plates recorded kinetic data. A repeated measures ANOVA was used to compare the asymmetry levels measured during all phases of the VJ, DJ, and DL. A significant difference was found between the levels of asymmetry displayed during the L and TO phases (p<.05). These findings suggest that there is greater asymmetry in the vGRF each leg experiences during landing than during take-off.

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