Authors : Nam Yong, Ju-Hye Park, Dong-Yeop Lee, Jae-Ho Yu, Jin-Seop Kim and Ji-Heon Hong
Abstract: The purpose of this study was to confirm the imbalance of bilateral rotator cuff strength in baseball players and to compare the differences with general public. This study was a cross sectional analysis of 92 subjects. Three groups of 62 male baseball players and 30 general public were studied. External rotator muscle strength of the rotator cuff was bilaterally measured with a hand-held dynamometer. Measured value was converted to Shoulder Strength Ratio (SSR) and analyzed with in-group, between-group. Statistical analysis was performed using independent t-test and ANOVA. Post hoc test of Scheffe was proceeded. Mean value of SSR for each player group was 0.94 in middle school players, 0.98 in high school players, 0.9 in adult players. SSR were lowest at adult baseball players, however, there was no significant difference in any baseball player groups. Mean value of shoulder external rotation strength ratio was 0.94 for baseball player group and 1.02 for general public group. Baseball player group of mean SST was lower than general public group. Unlike previous study with professional baseball player, adolescent baseball player’s dominant shoulder of external rotator muscle strength was not significantly weaker than non-dominant shoulder. However, there was significant difference between player and non-player groups. In this study, the external rotator strength ratio of baseball players showed significantly lower than general public group. Among baseball player, adult player group showed the greatest difference in bilateral external rotation strength.
Nam Yong, Ju-Hye Park, Dong-Yeop Lee, Jae-Ho Yu, Jin-Seop Kim and Ji-Heon Hong, 2018. Shoulder Strength Ratio Between Baseball Players and General Population. Journal of Engineering and Applied Sciences, 13: 3092-3096.