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Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study

OBJECTIVE: Anterior cruciate ligament reconstruction (ACLR) predisposes footballers for subsequent ACL and hamstring (HS) injury. This case series examines HS muscle activation patterns during the running in ACLR patients (bone-patellar tendon-bone (BTB) and (HS) graft) after completion of functiona...

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Autores principales: Einarsson, Einar, Thomson, Athol, Sas, Bart, Hansen, CLint, Gislason, Magnus, Whiteley, Rodney
Formato: Online Artículo Texto
Lenguaje:English
Publicado: BMJ Publishing Group 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7957131/
https://www.ncbi.nlm.nih.gov/pubmed/33782638
http://dx.doi.org/10.1136/bmjsem-2020-000875
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author Einarsson, Einar
Thomson, Athol
Sas, Bart
Hansen, CLint
Gislason, Magnus
Whiteley, Rodney
author_facet Einarsson, Einar
Thomson, Athol
Sas, Bart
Hansen, CLint
Gislason, Magnus
Whiteley, Rodney
author_sort Einarsson, Einar
collection PubMed
description OBJECTIVE: Anterior cruciate ligament reconstruction (ACLR) predisposes footballers for subsequent ACL and hamstring (HS) injury. This case series examines HS muscle activation patterns during the running in ACLR patients (bone-patellar tendon-bone (BTB) and (HS) graft) after completion of functional criteria allowing return to training. METHODS: Electromyography (EMG) recorded from medial and lateral HS bilaterally during treadmill running (12, 14 and 16 km/hour) from 21 male ACLR patients on average 7 months from surgery (5-9) that underwent (HS) (n=12) or BTB reconstruction (n=9) were compared with 19 healthy runners. Main outcome measures: EMG signal was normalised to peak during the running. Pairwise comparisons were made for each muscle group examining stance and swing activation for mean and peak EMG for each patient group and leg. RESULTS: Significantly lower relative peak activation in stance (not swing) phase for medial HS was seen for all conditions with effect sizes ranging from −0.63 (controls, BTB non-injured leg) to −1.09 (HS injured). For lateral HS only BTB injured were significantly lower in stance phase (−1.05) CONCLUSION: ACLR patients show neuromuscular alterations during different phases of running. The finding of reduced medial HS activity in stance phase might have implications for knee instability and HS muscle injury on resumption of sport.
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spelling pubmed-79571312021-03-28 Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study Einarsson, Einar Thomson, Athol Sas, Bart Hansen, CLint Gislason, Magnus Whiteley, Rodney BMJ Open Sport Exerc Med Short Report OBJECTIVE: Anterior cruciate ligament reconstruction (ACLR) predisposes footballers for subsequent ACL and hamstring (HS) injury. This case series examines HS muscle activation patterns during the running in ACLR patients (bone-patellar tendon-bone (BTB) and (HS) graft) after completion of functional criteria allowing return to training. METHODS: Electromyography (EMG) recorded from medial and lateral HS bilaterally during treadmill running (12, 14 and 16 km/hour) from 21 male ACLR patients on average 7 months from surgery (5-9) that underwent (HS) (n=12) or BTB reconstruction (n=9) were compared with 19 healthy runners. Main outcome measures: EMG signal was normalised to peak during the running. Pairwise comparisons were made for each muscle group examining stance and swing activation for mean and peak EMG for each patient group and leg. RESULTS: Significantly lower relative peak activation in stance (not swing) phase for medial HS was seen for all conditions with effect sizes ranging from −0.63 (controls, BTB non-injured leg) to −1.09 (HS injured). For lateral HS only BTB injured were significantly lower in stance phase (−1.05) CONCLUSION: ACLR patients show neuromuscular alterations during different phases of running. The finding of reduced medial HS activity in stance phase might have implications for knee instability and HS muscle injury on resumption of sport. BMJ Publishing Group 2021-03-11 /pmc/articles/PMC7957131/ /pubmed/33782638 http://dx.doi.org/10.1136/bmjsem-2020-000875 Text en © Author(s) (or their employer(s)) 2021. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ. http://creativecommons.org/licenses/by-nc/4.0/ http://creativecommons.org/licenses/by-nc/4.0/This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.
spellingShingle Short Report
Einarsson, Einar
Thomson, Athol
Sas, Bart
Hansen, CLint
Gislason, Magnus
Whiteley, Rodney
Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title_full Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title_fullStr Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title_full_unstemmed Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title_short Lower medial hamstring activity after ACL reconstruction during running: a cross-sectional study
title_sort lower medial hamstring activity after acl reconstruction during running: a cross-sectional study
topic Short Report
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7957131/
https://www.ncbi.nlm.nih.gov/pubmed/33782638
http://dx.doi.org/10.1136/bmjsem-2020-000875
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