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Effects of Sex and Fatigue on Biomechanical Measures During the Drop-Jump Task in Children

Effects of Sex and Fatigue on Biomechanical Measures During the Drop-Jump Task in Children


Title: Effects of Sex and Fatigue on Biomechanical Measures During the Drop-Jump Task in Children
Author: Briem, Kristin   orcid.org/0000-0002-0606-991X
Jónsdóttir, Kolbrún Vala
Árnason, Árni
Sveinsson, Thorarinn   orcid.org/0000-0001-8989-5514
Date: 2017-01
Language: English
Scope: 232596711667964
University/Institute: Háskóli Íslands
University of Iceland
School: Heilbrigðisvísindasvið (HÍ)
School of Health Sciences (UI)
Department: Læknadeild (HÍ)
Faculty of Medicine (UI)
Rannsóknarstofa í hreyfivísindum (HÍ)
Research Centre for Movement Sciences (UI)
Series: Orthopaedic Journal of Sports Medicine;5(1)
ISSN: 2325-9671
DOI: 10.1177/2325967116679640
Subject: Knee; ACL; Biomechanics; Pediatric sports medicine; Motion analysis; Injury prevention; Hné; Hreyfingar (lífeðlisfræði); Íþróttameiðsli; Hreyfifærni; Börn
URI: https://hdl.handle.net/20.500.11815/301

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Citation:

Briem, K., Jónsdóttir, K. V., Árnason, Á., & Sveinsson, Þ. (2017). Effects of Sex and Fatigue on Biomechanical Measures During the Drop-Jump Task in Children. Orthopaedic Journal of Sports Medicine, 5(1), 2325967116679640. doi:doi:10.1177/2325967116679640

Abstract:

Background: Female athletes have a higher rate of anterior cruciate ligament (ACL) injury than males from adolescence and into maturity, which is suggested to result from sex-specific changes in dynamic movement patterns with maturation. Few studies have studied movement strategies and response to fatigue in children. Purpose: To evaluate the effect of fatigue on biomechanical variables associated with increased risk for ACL injury during a drop-jump (DJ) performance in children. Study Design: Controlled laboratory study. Methods: A total of 116 children (mean age, 10.4 years) were recruited from local sports clubs and performed 5 repetitions of a DJ task before and after a fatigue protocol. Kinematic and kinetic data from initial contact (IC) to the first peak vertical ground reaction force (vGRF) were analyzed for both limbs, including limb and fatigue as within-subject factors for analyses between boys and girls. Pearson correlation coefficients were calculated to identify associations between variables of interest. Results: Girls demonstrated greater peak vGRF values than boys (by 8.1%; P < .05), there were greater peak vGRF values for the right limb than the left (by 6.2%; P < .001), and fatigue led to slightly greater values (P < .05). Although weak, the correlation between peak vGRF values and knee flexion excursion was stronger for girls (r = –0.20) than boys (r = –0.08) (P < .006). Fatigue resulted in greater knee flexion angles at IC and less excursion during landing, more so for girls (by 6.1° vs 1.4°; interaction, P < .001), although the knee flexion moment was generally lowered by fatigue (P < .001). Limb asymmetry in knee flexion moments was more pronounced for boys than for girls (interaction, P < .05), contrary to that seen in frontal plane knee moments, where asymmetry was much greater in girls than boys (interaction, P < .001). Conclusion: Even as young athletes, girls and boys seem to adopt dissimilar movement strategies and are differently affected by fatigue.

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This article is distributed under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License (http://www.creativecommons.org/licenses/by-nc-nd/3.0/) which permits non-commercial use, reproduction and distribution of the work as published without adaptation or alteration, without further permission provided the original work is attributed as specified on the SAGE and Open Access pages (https://us.sagepub.com/en-us/nam/open-access-at-sage).

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