Vol 13, Issue 1

Effect of Jump Direction and External Load on Single-Legged Jump-Landing Biomechanics

January 1, 2020 - By 

Authors

Alexander J. Hron, Sanford Health, Fargo, ND, USA
Colin W. Bond, Sanford Health, Fargo, ND, USA
Benjamin C. Noonan, Sanford Health, Fargo, ND, USA
International Journal of Exercise Science 13(1): 234-248, 2020. 
DOI: 10.70252/NTSB4796

Abstract

External load may increase an individual’s risk of non-contact anterior cruciate ligament (ACL) injury during single-legged jump-landing (SLJL).This study evaluated the effects of jump direction and external load on hip and knee joint motion and time to stabilization (TTS) during SLJL. Seventeen active males (n = 8) and females (22.2 ± 3.0 y, 1.75 ± 0.08 m, 73.4 ± 12.0 kg) participated in this randomized, crossover designed study. Single-legged jump-landings performed in two conditions, including without external load (BW) and with a torso-worn weight vest equal to 10% of the participant’s body weight (BW+10%), from backward, forward, medial, and lateral SLJL directions. Two-way repeated measures ANOVA did not identify any significant interactions (P > .01, η2: < .001 – .037), but some main effects for condition with small effect sizes were identified (P < .01,η2: .009 – .039). Several main effects for SLJL direction were identified with larger effect sizes (P < .01, η2: .010 – .574). This suggests SLJL direction may challenge different components of SLJL biomechanics, and that recreationally active, college-aged individuals may possess effective compensatory mechanisms that can mitigate the effect of BW+10%.

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