TY - JOUR

T1 - Shoulder rotation strength changes from preseason to midseason

T2 - A cohort study of 292 youth elite handball players without shoulder problems

AU - Liaghat, Behnam

AU - Bencke, Jesper

AU - Zebis, Mette K.

AU - Sørensen, Henrik

AU - Myklebust, Grethe

AU - Wedderkopp, Niels

AU - Lind, Martin

AU - Møller, Merete

PY - 2020/7

Y1 - 2020/7

N2 - U OBJECTIVE: To investigate change in shoulder rotation strength from preseason to midseason during a competitive season in youth elite handball players without shoulder problems. U DESIGN: Prospective cohort study. U METHODS: Players (n = 292, 45% female, 14-18 years of age) without shoulder problems from Danish youth elite handball clubs were assessed in the preseason and midseason. We measured isometric shoulder strength using handheld dynamometry in internal rotation (IR) and external rotation (ER) in supine, with the shoulder abducted 90° in neutral rotation and in 30° of IR. The primary outcome was the change in corresponding ER/IR ratio. U RESULTS: The mean ER/IR ratios increased from preseason to midseason in neutral rotation (male player difference, 0.02; 95% confidence interval [CI]: –0.01, 0.06; female player difference, 0.05; 95% CI: 0.01, 0.09) and in 30° of IR (male player difference, 0.15; 95% CI: 0.11, 0.20; female player difference, 0.12; 95% CI: 0.07, 0.17). The change in ER/IR ratio may be explained by an increase in ER strength in female players and a decrease in IR strength in male players. The amount of change in ER/IR ratio over the season was greater than individual measurement error metrics for 45% to 66% of the players. U CONCLUSION: Shoulder rotation strength ratios changed during a competitive season in Danish youth elite handball players.

AB - U OBJECTIVE: To investigate change in shoulder rotation strength from preseason to midseason during a competitive season in youth elite handball players without shoulder problems. U DESIGN: Prospective cohort study. U METHODS: Players (n = 292, 45% female, 14-18 years of age) without shoulder problems from Danish youth elite handball clubs were assessed in the preseason and midseason. We measured isometric shoulder strength using handheld dynamometry in internal rotation (IR) and external rotation (ER) in supine, with the shoulder abducted 90° in neutral rotation and in 30° of IR. The primary outcome was the change in corresponding ER/IR ratio. U RESULTS: The mean ER/IR ratios increased from preseason to midseason in neutral rotation (male player difference, 0.02; 95% confidence interval [CI]: –0.01, 0.06; female player difference, 0.05; 95% CI: 0.01, 0.09) and in 30° of IR (male player difference, 0.15; 95% CI: 0.11, 0.20; female player difference, 0.12; 95% CI: 0.07, 0.17). The change in ER/IR ratio may be explained by an increase in ER strength in female players and a decrease in IR strength in male players. The amount of change in ER/IR ratio over the season was greater than individual measurement error metrics for 45% to 66% of the players. U CONCLUSION: Shoulder rotation strength ratios changed during a competitive season in Danish youth elite handball players.

KW - Adolescent

KW - Handball

KW - Handheld dynamometry

KW - Normative reference values

KW - Shoulder strength

UR - http://www.scopus.com/inward/record.url?scp=85087387663&partnerID=8YFLogxK

U2 - 10.2519/jospt.2020.9183

DO - 10.2519/jospt.2020.9183

M3 - Journal article

C2 - 32605467

AN - SCOPUS:85087387663

VL - 50

SP - 381

EP - 387

JO - Journal of Orthopaedic and Sports Physical Therapy

JF - Journal of Orthopaedic and Sports Physical Therapy

SN - 0190-6011

IS - 7

ER -