Shoulder Muscle Imbalance as a Risk for Shoulder Injury in Elite Adolescent Badminton Players

Study Overview
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Brief Summary
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Background: To assess the impact of pre-season clinical measures and rotator muscles strength on the risk of significant shoulder injury (SSI) in elite adolescent badminton players Design: Prospective cohort study Participants: Nine elite adolescents badminton players were included and followed from September 2018 to May 2019. Independent variables: A pre-season visit consisted in clinical and isokinetic shoulder strength testing. Isokinetic internal and external rotator shoulder muscles strength was tested at 60, 120 and 240°/s. Conventional and functional (eccentric-to-concentric) ratios (FR) were calculated. SSI collection was performed by an experienced sport physician.

Official Title
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Shoulder Muscle Imbalance as a Risk for Shoulder Injury in Elite Adolescent Badminton Players : a Prospective Pilot Study

Conditions
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Sport Injury, Shoulder Injuries

Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: All the elite adolescent badminton players from a high-level club. Exclusion Criteria: Players who had SSI in the 3 months prior to the isokinetic test or had shoulder surgery
Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Elite adolescent badminton players<br>The population was all the elite adolescent badminton players from a high-level club. We excluded players who had SSI in the 3 months prior to the isokinetic test or had shoulder surgery. They were included and followed from September 2018 to May 2019. | |

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Change from Baseline Isokinetic strength testing (peak torques) at 8 months | Shoulder rotator muscles isokinetic strength test, Measures: Peak Torque on internal rotator muscles (IR) and external rotator muscles (ER), in NM (newton.meter) | Two evaluations, one preseason (september 2018) and one postseason (may 2019) visits | 
| Change from Baseline Isokinetic strength testing (ratios) at 8 months | Shoulder rotator muscles isokinetic strength test, Measures: ratios between external rotator muscles (ER) and internal rotator muscles (IR) (ER:IR), in percent (%) | Two evaluations, one preseason (september 2018) and one postseason (may 2019) visits | 
| Clinical measurements, ROM | Shoulder internal and external rotation range of motion (ROM) | One evaluation, one preseason visit (september 2018) | 
| Clinical measurements TAD | table-to-acromion distance (in cm) | One evaluation, one preseason visit (september 2018) | 
| Significant Shoulder Injury (SSI) collection (number of injury) | Significant Shoulder Injury (SSI) collection for the number of injury | During the badminton season, the number (number, n) of injury was recorded from september 2018 to may 2019 | 
| Significant Shoulder Injury (SSI) collection (type of injury) | Significant Shoulder Injury (SSI) collection for the type of injury | During the badminton season, the type of injury (number, n) was recorded from september 2018 to may 2019 | 
| Significant Shoulder Injury (SSI) collection (time lost from participation) | Significant Shoulder Injury (SSI) collection for time lost from participation due to the injury | During the badminton season, the time lost from participation was recorded (in days) from september 2018 to may 2019 |