Investigation of muscle strength in first abduction motion of high school baseball players. .

There have been a number of reports of muscle strength in the shoulders of high school baseball players, especially reports of rotation motion (internal and external rotation). This study had two purposes : one was to investigate standard muscle strength in first abduction motion and the other was to compare muscle power between an intact and an injured shoulder. We used orthopaedic tests (SSP test, ISP test, Jobe test impingement test), measured the range of motion for internal and external rotation of the shoulder, and measured muscle strength of the shoulder in first abduction motion using the BIODEX system 3. The maximum torque of first abduction motion was 36.5±4.8N-m for the pain group and 36.1±4.2N-m for the non-pain group. There was no statistically significant difference. This indicates that strength of the shoulder in first abduction motion was not affected by a shoulder disorder. The average muscle strength in first abduction motion for high school baseball players was 10.1±2.0%(kg). This data showed that muscle strength per weight in first abduction in high school baseball players was about 10% (kg) of weight, so that this data was available for sports medical examinations. [ABSTRACT FROM AUTHOR]