The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study

# Background Anterior Cruciate Ligament (ACL) injury prevention interventions have used trained experts to ensure quality feedback. Dyad (peer) feedback may be a more cost-effective method to deliver feedback to athletes. # Purpose To determine the immediate effects of dyad versus expert feedback...

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Autores principales:	Kelly A. Leonard, Janet E. Simon, Jae Yom, Dustin R. Grooms
Formato:	article
Lenguaje:	EN
Publicado:	North American Sports Medicine Institute 2021
Materias:	Sports medicine RC1200-1245
Acceso en línea:	https://doaj.org/article/a7cc3674b0024f54bfa2f736064c93a2
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spelling	oai:doaj.org-article:a7cc3674b0024f54bfa2f736064c93a22021-12-02T17:11:32ZThe Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study10.26603/001c.187172159-2896https://doaj.org/article/a7cc3674b0024f54bfa2f736064c93a22021-02-01T00:00:00Zhttps://ijspt.scholasticahq.com/article/18717-the-immediate-effects-of-expert-and-dyad-external-focus-feedback-on-drop-landing-biomechanics-in-female-athletes-an-instrumented-field-study.pdfhttps://doaj.org/toc/2159-2896# Background Anterior Cruciate Ligament (ACL) injury prevention interventions have used trained experts to ensure quality feedback. Dyad (peer) feedback may be a more cost-effective method to deliver feedback to athletes. # Purpose To determine the immediate effects of dyad versus expert feedback on drop landing kinematics and kinetics in female athletes. # Study Design Cohort study # Setting College gymnasium # Methods Two teams (one female basketball and one female volleyball), from a local college, were team randomized to dyad feedback (volleyball team) or expert feedback (basketball team) (13 expert, 19±0.87years, 1.7±0.09m, 68.04±7.21kg) (10 dyad 19.4±1.07years, 1.73±0.08m, 72.18±11.23kg). Participants completed drop vertical jumps at two different time points (pre- and post-feedback). Knee flexion and abduction displacement were assessed with Inertial Measurement Units (IMUs) and vertical ground reaction force (vGRF) was assessed with a force plate during the landing phase of the drop vertical jump and compared across groups and condition (pre- and post-feedback) with a repeated measures ANCOVA a priori α <0.02 was set for multiple tests conducted. # Results There were no significant differences between groups for flexion displacement. There was a significant change pre- to post- (decrease 4.65˚ p=0.01) in abduction displacement, with no group effect. There was a significant interaction of group by condition (p=0.01) for vGRF with no difference between groups before feedback (p>0.05). Between groups there was a decrease of vGRF in the expert group (difference 0.45 N\bw-1, p=0.01) at post-feedback relative to dyad. Within the expert group there was a significant difference between pre- and post-feedback (difference 0.72 N\bw-1, p=0.01), while the dyad group did not change pre- to post-feedback (difference 0.18 N\*bw-1, p=0.67). # Conclusion Movement screening experts giving real-time feedback were successful in improving key injury-risk kinematics and kinetics in female athletes, while dyad feedback only improved kinematics, indicating that expert feedback may be needed to ensure changes in kinematics and kinetics. # Level of Evidence 2Kelly A. LeonardJanet E. SimonJae YomDustin R. GroomsNorth American Sports Medicine InstitutearticleSports medicineRC1200-1245ENInternational Journal of Sports Physical Therapy, Vol 16, Iss 1 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sports medicine RC1200-1245
spellingShingle	Sports medicine RC1200-1245 Kelly A. Leonard Janet E. Simon Jae Yom Dustin R. Grooms The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
description	# Background Anterior Cruciate Ligament (ACL) injury prevention interventions have used trained experts to ensure quality feedback. Dyad (peer) feedback may be a more cost-effective method to deliver feedback to athletes. # Purpose To determine the immediate effects of dyad versus expert feedback on drop landing kinematics and kinetics in female athletes. # Study Design Cohort study # Setting College gymnasium # Methods Two teams (one female basketball and one female volleyball), from a local college, were team randomized to dyad feedback (volleyball team) or expert feedback (basketball team) (13 expert, 19±0.87years, 1.7±0.09m, 68.04±7.21kg) (10 dyad 19.4±1.07years, 1.73±0.08m, 72.18±11.23kg). Participants completed drop vertical jumps at two different time points (pre- and post-feedback). Knee flexion and abduction displacement were assessed with Inertial Measurement Units (IMUs) and vertical ground reaction force (vGRF) was assessed with a force plate during the landing phase of the drop vertical jump and compared across groups and condition (pre- and post-feedback) with a repeated measures ANCOVA a priori α <0.02 was set for multiple tests conducted. # Results There were no significant differences between groups for flexion displacement. There was a significant change pre- to post- (decrease 4.65˚ p=0.01) in abduction displacement, with no group effect. There was a significant interaction of group by condition (p=0.01) for vGRF with no difference between groups before feedback (p>0.05). Between groups there was a decrease of vGRF in the expert group (difference 0.45 N\bw-1, p=0.01) at post-feedback relative to dyad. Within the expert group there was a significant difference between pre- and post-feedback (difference 0.72 N\bw-1, p=0.01), while the dyad group did not change pre- to post-feedback (difference 0.18 N\*bw-1, p=0.67). # Conclusion Movement screening experts giving real-time feedback were successful in improving key injury-risk kinematics and kinetics in female athletes, while dyad feedback only improved kinematics, indicating that expert feedback may be needed to ensure changes in kinematics and kinetics. # Level of Evidence 2
format	article
author	Kelly A. Leonard Janet E. Simon Jae Yom Dustin R. Grooms
author_facet	Kelly A. Leonard Janet E. Simon Jae Yom Dustin R. Grooms
author_sort	Kelly A. Leonard
title	The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
title_short	The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
title_full	The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
title_fullStr	The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
title_full_unstemmed	The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study
title_sort	immediate effects of expert and dyad external focus feedback on drop landing biomechanics in female athletes: an instrumented field study
publisher	North American Sports Medicine Institute
publishDate	2021
url	https://doaj.org/article/a7cc3674b0024f54bfa2f736064c93a2
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The Immediate Effects of Expert and Dyad External Focus Feedback on Drop Landing Biomechanics in Female Athletes: An Instrumented Field Study

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