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Age-related changes in normal isometric shoulder strength
R E Hughes1, M E Johnson, S W O'Driscoll
1Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic and Mayo Foundation, Rochester, Minnesota 55905, USA.
The American Journal of Sports Medicine
|September 25, 1999
Summary
This study created normative data for isometric shoulder strength across various movements. These findings provide a benchmark for clinicians evaluating patients with shoulder abnormalities.
Area of Science:
- Orthopedics
- Sports Medicine
- Rehabilitation Science
Background:
- Assessing isometric shoulder strength is crucial for patients with bilateral shoulder abnormalities.
- Existing normative data may not cover all clinically relevant positions and movements.
Purpose of the Study:
- To develop a comprehensive normative database for isometric shoulder strength.
- To establish reference values for various shoulder positions and movements.
Main Methods:
- Isometric shoulder strength was measured using a modified Cybex II dynamometer.
- Twenty exertion and posture combinations were tested on dominant and nondominant sides.
- A cross-sectional study included 120 healthy adults aged 20-78 years.
Main Results:
- Normative strength data tables were generated.
- Age negatively correlated with strength; weight positively correlated with strength.
- Men exhibited greater strength than women, controlling for age and weight.
Conclusions:
- The developed normative data provide a clinical standard for evaluating shoulder strength.
- Age, sex, and weight significantly influence isometric shoulder strength.
- These data aid clinicians in assessing patients with shoulder impairments.