Seasonal changes in glenohumeral joint isokinetic strength in professional rugby league players

Matthew Haines, Michael Fish, David O'Sullivan

Research output: Contribution to journalArticle

Abstract

Objective: To assess glenohumeral joint (GHJ) rotation strength across a rugby league season, since strength of rotator cuff musculature may protect against contact injuries to the shoulder.
Design: A prospective cohort study was used to compare GHJ rotation pre-, in-, and post-season.
Setting: Laboratory.
Participants: Twenty-nine players from a professional European Super League club.
Main Outcome Measures: Isokinetic dynamometry for concentric and eccentric muscle actions for shoulder internal and external rotation at 240°/s. Peak torque, traditional strength ratios, and dynamic control ratios were compared.
Results: There were no significant differences between peak torque strength parameters at any time point. Similarly, differences in strength ratios failed to reach statistical significance across the season. Ipsilateral strength ratios were indicative of selective strengthening of internal rotators for concentric and eccentric muscle actions.
Conclusions: The findings suggest that rugby league players are no more likely to sustain a shoulder injury in the latter stages of the season as a result of decreased GHJ rotation strength. Players were able to maintain strength across the season which is valuable to practitioners developing conditioning programmes to optimise performance and minimise the risk of injury. This may afford protection, particularly during forced external rotation following physical contact.
LanguageEnglish
Pages32-37
Number of pages6
JournalPhysical Therapy in Sport
Volume39
Early online date17 Jun 2019
DOIs
Publication statusPublished - 1 Sep 2019

Fingerprint

Shoulder Joint
Football
Torque
Muscles
Rotator Cuff
Cohort Studies
Outcome Assessment (Health Care)
Prospective Studies
Wounds and Injuries

Cite this

@article{f6c3bda92a2c4387897dde0172411d12,
title = "Seasonal changes in glenohumeral joint isokinetic strength in professional rugby league players",
abstract = "Objective: To assess glenohumeral joint (GHJ) rotation strength across a rugby league season, since strength of rotator cuff musculature may protect against contact injuries to the shoulder. Design: A prospective cohort study was used to compare GHJ rotation pre-, in-, and post-season.Setting: Laboratory.Participants: Twenty-nine players from a professional European Super League club.Main Outcome Measures: Isokinetic dynamometry for concentric and eccentric muscle actions for shoulder internal and external rotation at 240°/s. Peak torque, traditional strength ratios, and dynamic control ratios were compared. Results: There were no significant differences between peak torque strength parameters at any time point. Similarly, differences in strength ratios failed to reach statistical significance across the season. Ipsilateral strength ratios were indicative of selective strengthening of internal rotators for concentric and eccentric muscle actions. Conclusions: The findings suggest that rugby league players are no more likely to sustain a shoulder injury in the latter stages of the season as a result of decreased GHJ rotation strength. Players were able to maintain strength across the season which is valuable to practitioners developing conditioning programmes to optimise performance and minimise the risk of injury. This may afford protection, particularly during forced external rotation following physical contact.",
keywords = "Glenohumeral joint, Rotator cuff, Isokinetic strength, Rugby league",
author = "Matthew Haines and Michael Fish and David O'Sullivan",
year = "2019",
month = "9",
day = "1",
doi = "10.1016/j.ptsp.2019.06.005",
language = "English",
volume = "39",
pages = "32--37",
journal = "Physical Therapy in Sport",
issn = "1873-1600",
publisher = "Elsevier BV",

}

Seasonal changes in glenohumeral joint isokinetic strength in professional rugby league players. / Haines, Matthew; Fish, Michael; O'Sullivan, David .

In: Physical Therapy in Sport, Vol. 39, 01.09.2019, p. 32-37.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Seasonal changes in glenohumeral joint isokinetic strength in professional rugby league players

AU - Haines, Matthew

AU - Fish, Michael

AU - O'Sullivan, David

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Objective: To assess glenohumeral joint (GHJ) rotation strength across a rugby league season, since strength of rotator cuff musculature may protect against contact injuries to the shoulder. Design: A prospective cohort study was used to compare GHJ rotation pre-, in-, and post-season.Setting: Laboratory.Participants: Twenty-nine players from a professional European Super League club.Main Outcome Measures: Isokinetic dynamometry for concentric and eccentric muscle actions for shoulder internal and external rotation at 240°/s. Peak torque, traditional strength ratios, and dynamic control ratios were compared. Results: There were no significant differences between peak torque strength parameters at any time point. Similarly, differences in strength ratios failed to reach statistical significance across the season. Ipsilateral strength ratios were indicative of selective strengthening of internal rotators for concentric and eccentric muscle actions. Conclusions: The findings suggest that rugby league players are no more likely to sustain a shoulder injury in the latter stages of the season as a result of decreased GHJ rotation strength. Players were able to maintain strength across the season which is valuable to practitioners developing conditioning programmes to optimise performance and minimise the risk of injury. This may afford protection, particularly during forced external rotation following physical contact.

AB - Objective: To assess glenohumeral joint (GHJ) rotation strength across a rugby league season, since strength of rotator cuff musculature may protect against contact injuries to the shoulder. Design: A prospective cohort study was used to compare GHJ rotation pre-, in-, and post-season.Setting: Laboratory.Participants: Twenty-nine players from a professional European Super League club.Main Outcome Measures: Isokinetic dynamometry for concentric and eccentric muscle actions for shoulder internal and external rotation at 240°/s. Peak torque, traditional strength ratios, and dynamic control ratios were compared. Results: There were no significant differences between peak torque strength parameters at any time point. Similarly, differences in strength ratios failed to reach statistical significance across the season. Ipsilateral strength ratios were indicative of selective strengthening of internal rotators for concentric and eccentric muscle actions. Conclusions: The findings suggest that rugby league players are no more likely to sustain a shoulder injury in the latter stages of the season as a result of decreased GHJ rotation strength. Players were able to maintain strength across the season which is valuable to practitioners developing conditioning programmes to optimise performance and minimise the risk of injury. This may afford protection, particularly during forced external rotation following physical contact.

KW - Glenohumeral joint

KW - Rotator cuff

KW - Isokinetic strength

KW - Rugby league

U2 - 10.1016/j.ptsp.2019.06.005

DO - 10.1016/j.ptsp.2019.06.005

M3 - Article

VL - 39

SP - 32

EP - 37

JO - Physical Therapy in Sport

T2 - Physical Therapy in Sport

JF - Physical Therapy in Sport

SN - 1873-1600

ER -