Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury

M. K. Zebis, R. S. Sorensen, K. Thorborg, T. Bandholm, P. Holmich, L. L. Andersen, G. Myklebust, H. B. Lauridsen, Per Aagaard, J. Bencke

Research output: Contribution to journalConference abstract in journalResearchpeer-review

Abstract

Background: Reduced hamstring pre-activity during sidecutting increases the risk for non-contact ACL injury. During the last decade resistance training of the lower limb muscles has become an integral part ofACLinjury prevention in e.g. soccer and handball. However, it is not known whether a strong hamstring (ACL-agonist) musculature is associated with a high level of hamstring muscle pre-activity during high risk movements such as sidecutting. Purpose: The purpose of this study was to examine the relationship between hamstring muscle pre-activity recorded during a standardized sidecutting maneuver and maximal isometric hamstring muscle strength. Methods: Eighty-five female athletes (17+/-1 yrs) were screened for neuromuscular pre-activity in medial (ST) and lateral (BF) hamstring muscle during a sidecutting maneuver. Maximal hamstring muscle strength [N/kg BW] (MVC) was measured in a static dynamometer. Neuromuscular activity calculated as average EMG amplitude obtained during sidecutting in the 10 ms interval prior to initial contact (IC) was normalized to peak EMG amplitude obtained during MVC. The correlation between % EMG pre-activity (mean of ST and BF) and MVC was evaluated by Spearman rank correlation analysis. Results: The correlation coefficient (rs) between hamstring pre-landing EMG activity and MVC was 0.109 (P = 0.319). Conclusion(s): No direct association was observed between preparatory hamstring muscle activity and MVC. This indicates that high muscle strength may not per se translate into high levels of muscle pre-activity during movements like the sidecutting maneuver. Implications: Other exercise modalities (i.e. neuromuscular training) are needed to optimize hamstring muscle pre-activity during movements associated with non-contact ACL injury.
Original languageEnglish
JournalPhysiotherapy
Volume101
Issue numberS1
Pages (from-to)eS1713-eS1714
ISSN0031-9406
DOIs
Publication statusPublished - 2015
EventWorld Confederation for Physical Therapy Congress 2015 - Singapore, Singapore
Duration: 1. May 20154. May 2015

Conference

ConferenceWorld Confederation for Physical Therapy Congress 2015
CountrySingapore
CitySingapore
Period01/05/201504/05/2015

Cite this

Zebis, M. K., Sorensen, R. S., Thorborg, K., Bandholm, T., Holmich, P., Andersen, L. L., ... Bencke, J. (2015). Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury. Physiotherapy, 101(S1), eS1713-eS1714. https://doi.org/10.1016/j.physio.2015.03.127
Zebis, M. K. ; Sorensen, R. S. ; Thorborg, K. ; Bandholm, T. ; Holmich, P. ; Andersen, L. L. ; Myklebust, G. ; Lauridsen, H. B. ; Aagaard, Per ; Bencke, J. / Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury. In: Physiotherapy. 2015 ; Vol. 101, No. S1. pp. eS1713-eS1714.
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title = "Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury",
abstract = "Background: Reduced hamstring pre-activity during sidecutting increases the risk for non-contact ACL injury. During the last decade resistance training of the lower limb muscles has become an integral part ofACLinjury prevention in e.g. soccer and handball. However, it is not known whether a strong hamstring (ACL-agonist) musculature is associated with a high level of hamstring muscle pre-activity during high risk movements such as sidecutting. Purpose: The purpose of this study was to examine the relationship between hamstring muscle pre-activity recorded during a standardized sidecutting maneuver and maximal isometric hamstring muscle strength. Methods: Eighty-five female athletes (17+/-1 yrs) were screened for neuromuscular pre-activity in medial (ST) and lateral (BF) hamstring muscle during a sidecutting maneuver. Maximal hamstring muscle strength [N/kg BW] (MVC) was measured in a static dynamometer. Neuromuscular activity calculated as average EMG amplitude obtained during sidecutting in the 10 ms interval prior to initial contact (IC) was normalized to peak EMG amplitude obtained during MVC. The correlation between {\%} EMG pre-activity (mean of ST and BF) and MVC was evaluated by Spearman rank correlation analysis. Results: The correlation coefficient (rs) between hamstring pre-landing EMG activity and MVC was 0.109 (P = 0.319). Conclusion(s): No direct association was observed between preparatory hamstring muscle activity and MVC. This indicates that high muscle strength may not per se translate into high levels of muscle pre-activity during movements like the sidecutting maneuver. Implications: Other exercise modalities (i.e. neuromuscular training) are needed to optimize hamstring muscle pre-activity during movements associated with non-contact ACL injury.",
keywords = "*injury *muscle strength *hamstring *physiotherapy *neuromuscular function electromyogram muscle risk isometrics correlation coefficient correlation analysis muscle contraction agonist soccer prevention dynamometer leg muscle human athlete exercise female resistance training",
author = "Zebis, {M. K.} and Sorensen, {R. S.} and K. Thorborg and T. Bandholm and P. Holmich and Andersen, {L. L.} and G. Myklebust and Lauridsen, {H. B.} and Per Aagaard and J. Bencke",
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doi = "10.1016/j.physio.2015.03.127",
language = "English",
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Zebis, MK, Sorensen, RS, Thorborg, K, Bandholm, T, Holmich, P, Andersen, LL, Myklebust, G, Lauridsen, HB, Aagaard, P & Bencke, J 2015, 'Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury', Physiotherapy, vol. 101, no. S1, pp. eS1713-eS1714. https://doi.org/10.1016/j.physio.2015.03.127

Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury. / Zebis, M. K.; Sorensen, R. S.; Thorborg, K.; Bandholm, T.; Holmich, P.; Andersen, L. L.; Myklebust, G.; Lauridsen, H. B.; Aagaard, Per; Bencke, J.

In: Physiotherapy, Vol. 101, No. S1, 2015, p. eS1713-eS1714.

Research output: Contribution to journalConference abstract in journalResearchpeer-review

TY - ABST

T1 - Association between maximal hamstring muscle strength and hamstring muscle pre-activity during a movement associated with non-contact ACL injury

AU - Zebis, M. K.

AU - Sorensen, R. S.

AU - Thorborg, K.

AU - Bandholm, T.

AU - Holmich, P.

AU - Andersen, L. L.

AU - Myklebust, G.

AU - Lauridsen, H. B.

AU - Aagaard, Per

AU - Bencke, J.

PY - 2015

Y1 - 2015

N2 - Background: Reduced hamstring pre-activity during sidecutting increases the risk for non-contact ACL injury. During the last decade resistance training of the lower limb muscles has become an integral part ofACLinjury prevention in e.g. soccer and handball. However, it is not known whether a strong hamstring (ACL-agonist) musculature is associated with a high level of hamstring muscle pre-activity during high risk movements such as sidecutting. Purpose: The purpose of this study was to examine the relationship between hamstring muscle pre-activity recorded during a standardized sidecutting maneuver and maximal isometric hamstring muscle strength. Methods: Eighty-five female athletes (17+/-1 yrs) were screened for neuromuscular pre-activity in medial (ST) and lateral (BF) hamstring muscle during a sidecutting maneuver. Maximal hamstring muscle strength [N/kg BW] (MVC) was measured in a static dynamometer. Neuromuscular activity calculated as average EMG amplitude obtained during sidecutting in the 10 ms interval prior to initial contact (IC) was normalized to peak EMG amplitude obtained during MVC. The correlation between % EMG pre-activity (mean of ST and BF) and MVC was evaluated by Spearman rank correlation analysis. Results: The correlation coefficient (rs) between hamstring pre-landing EMG activity and MVC was 0.109 (P = 0.319). Conclusion(s): No direct association was observed between preparatory hamstring muscle activity and MVC. This indicates that high muscle strength may not per se translate into high levels of muscle pre-activity during movements like the sidecutting maneuver. Implications: Other exercise modalities (i.e. neuromuscular training) are needed to optimize hamstring muscle pre-activity during movements associated with non-contact ACL injury.

AB - Background: Reduced hamstring pre-activity during sidecutting increases the risk for non-contact ACL injury. During the last decade resistance training of the lower limb muscles has become an integral part ofACLinjury prevention in e.g. soccer and handball. However, it is not known whether a strong hamstring (ACL-agonist) musculature is associated with a high level of hamstring muscle pre-activity during high risk movements such as sidecutting. Purpose: The purpose of this study was to examine the relationship between hamstring muscle pre-activity recorded during a standardized sidecutting maneuver and maximal isometric hamstring muscle strength. Methods: Eighty-five female athletes (17+/-1 yrs) were screened for neuromuscular pre-activity in medial (ST) and lateral (BF) hamstring muscle during a sidecutting maneuver. Maximal hamstring muscle strength [N/kg BW] (MVC) was measured in a static dynamometer. Neuromuscular activity calculated as average EMG amplitude obtained during sidecutting in the 10 ms interval prior to initial contact (IC) was normalized to peak EMG amplitude obtained during MVC. The correlation between % EMG pre-activity (mean of ST and BF) and MVC was evaluated by Spearman rank correlation analysis. Results: The correlation coefficient (rs) between hamstring pre-landing EMG activity and MVC was 0.109 (P = 0.319). Conclusion(s): No direct association was observed between preparatory hamstring muscle activity and MVC. This indicates that high muscle strength may not per se translate into high levels of muscle pre-activity during movements like the sidecutting maneuver. Implications: Other exercise modalities (i.e. neuromuscular training) are needed to optimize hamstring muscle pre-activity during movements associated with non-contact ACL injury.

KW - injury muscle strength hamstring physiotherapy neuromuscular function electromyogram muscle risk isometrics correlation coefficient correlation analysis muscle contraction agonist soccer prevention dynamometer leg muscle human athlete exercise female resi

U2 - 10.1016/j.physio.2015.03.127

DO - 10.1016/j.physio.2015.03.127

M3 - Conference abstract in journal

VL - 101

SP - eS1713-eS1714

JO - Physiotherapy

JF - Physiotherapy

SN - 0031-9406

IS - S1

ER -