Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension

Tine Alkjær; Erik B Simonsen; S Peter Magnusson; Poul Dyhre-Poulsen; Per Aagaard

doi:10.1016/j.knee.2011.12.006

Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension

Tine Alkjær, Erik B Simonsen, S Peter Magnusson, Poul Dyhre-Poulsen, Per Aagaard

21 Citations (Scopus)

Abstract

INTRODUCTION: Coactivation of the hamstring muscles during dynamic knee extension may compensate for increased knee joint laxity in anterior cruciate ligament (ACL) deficient subjects. This study examined if antagonist muscle coactivation during maximal dynamic knee extension was elevated in subjects with anterior cruciate ligament (ACL) deficiency compared to age-matched healthy controls. METHODS: Electromyography (EMG) and net knee joint moments were recorded during maximal concentric quadriceps and eccentric hamstring contractions, performed in an isokinetic dynamometer (ROM: 90-10°, angular speed: 30°/s). Hamstring antagonist EMG recorded during concentric quadriceps contraction was converted into antagonist moment based on the EMG-moment relationship observed during eccentric agonist contractions. RESULTS: The magnitude of antagonist hamstring EMG was 65.5% higher in ACL deficient subjects compared to healthy controls (p

Original language	English
Journal	Knee
Volume	19
Issue number	5
Pages (from-to)	633-639
Number of pages	7
ISSN	0968-0160
DOIs	https://doi.org/10.1016/j.knee.2011.12.006
Publication status	Published - Oct 2012

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title = "Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension",

abstract = "INTRODUCTION: Coactivation of the hamstring muscles during dynamic knee extension may compensate for increased knee joint laxity in anterior cruciate ligament (ACL) deficient subjects. This study examined if antagonist muscle coactivation during maximal dynamic knee extension was elevated in subjects with anterior cruciate ligament (ACL) deficiency compared to age-matched healthy controls. METHODS: Electromyography (EMG) and net knee joint moments were recorded during maximal concentric quadriceps and eccentric hamstring contractions, performed in an isokinetic dynamometer (ROM: 90-10°, angular speed: 30°/s). Hamstring antagonist EMG recorded during concentric quadriceps contraction was converted into antagonist moment based on the EMG-moment relationship observed during eccentric agonist contractions. RESULTS: The magnitude of antagonist hamstring EMG was 65.5% higher in ACL deficient subjects compared to healthy controls (p",

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T1 - Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension

AU - Alkjær, Tine

AU - Simonsen, Erik B

AU - Magnusson, S Peter

AU - Dyhre-Poulsen, Poul

AU - Aagaard, Per

PY - 2012/10

Y1 - 2012/10

N2 - INTRODUCTION: Coactivation of the hamstring muscles during dynamic knee extension may compensate for increased knee joint laxity in anterior cruciate ligament (ACL) deficient subjects. This study examined if antagonist muscle coactivation during maximal dynamic knee extension was elevated in subjects with anterior cruciate ligament (ACL) deficiency compared to age-matched healthy controls. METHODS: Electromyography (EMG) and net knee joint moments were recorded during maximal concentric quadriceps and eccentric hamstring contractions, performed in an isokinetic dynamometer (ROM: 90-10°, angular speed: 30°/s). Hamstring antagonist EMG recorded during concentric quadriceps contraction was converted into antagonist moment based on the EMG-moment relationship observed during eccentric agonist contractions. RESULTS: The magnitude of antagonist hamstring EMG was 65.5% higher in ACL deficient subjects compared to healthy controls (p

AB - INTRODUCTION: Coactivation of the hamstring muscles during dynamic knee extension may compensate for increased knee joint laxity in anterior cruciate ligament (ACL) deficient subjects. This study examined if antagonist muscle coactivation during maximal dynamic knee extension was elevated in subjects with anterior cruciate ligament (ACL) deficiency compared to age-matched healthy controls. METHODS: Electromyography (EMG) and net knee joint moments were recorded during maximal concentric quadriceps and eccentric hamstring contractions, performed in an isokinetic dynamometer (ROM: 90-10°, angular speed: 30°/s). Hamstring antagonist EMG recorded during concentric quadriceps contraction was converted into antagonist moment based on the EMG-moment relationship observed during eccentric agonist contractions. RESULTS: The magnitude of antagonist hamstring EMG was 65.5% higher in ACL deficient subjects compared to healthy controls (p

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DO - 10.1016/j.knee.2011.12.006

M3 - Journal article

C2 - 22284964

SN - 0968-0160

VL - 19

SP - 633

EP - 639

JO - Knee

JF - Knee

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Antagonist muscle moment is increased in ACL deficient subjects during maximal dynamic knee extension

Abstract

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