15th annual ECSS Congress, Antalya, Turkey, 23 - 26 July 2010, pp.1113
Overhead motion is a complex activity that needs excessive personal ability. It adds a big stress on shoulder complex. Shoulders of overhead athletes (tennis and badminton) are at risk of micro-traumatic stresses. These traumas cause physical changes to some extent in the dominant shoulder compared to non-dominant shoulder. These changes are increased external rotation (ER) and limited internal rotation (IR). In order to describe the shoulder that is at risk and to develop strategies for prevention and rehabilitation, we have to determine the range of adaptation for healthy thrower shoulder. The objective our study is to evaluate the range of motion (ROM) on the shoulder complex of adolescent racket players.
One hundred ninety one subjects (60 tennis, 64 badminton, 67sedantary) with an average age of 16.4±0.8 were enrolled in this study. We measured glenohumeral IR, ER and total ROM (TR) in dominant and non-dominant shoulders. All participants were healthy and had no shoulder or skeleton injury. They had not undergone any surgery. Standard universal goniometry was used for ROM measurements. All measurements were performed for glenohumeral joint internal and external rotation at 90 degrees abduction. SPSS 14 were used for statistical measurements, 2(sides) x 3(sports) ANOVA and T-Test were done.
There was a statistical significant difference when IR, ER and TR measurements in dominant shoulders (p<0,001, F= 28,233, 39,979, 14,768 respectively) and non-dominant shoulders (p<0,001, F= 8,660, 6,542, 12,463 respectively) were compared. Between male and female participants, ANOVA revealed a significant difference (p<0,001) in terms of IR and ER in dominant and non-dominant shoulders. When TR was compared, male athletes showed no significant difference. The female athletes had statistically significant results in terms of TR (p<0,001). As a result, the measurement of ER angle was greater in tennis players compared to badminton players. Female athletes had greater ROM compared to male athletes.
Previous studies showed decreased IR and increased ER measurements in dominant shoulder. We had concordant results with previous studies. Repetitive movements in sports cause adaptation on related joints. The extent of increase or decrease of ROM is the indicator to this adaptation process. Our results indicate that tennis is more effective then badminton in terms of ROM.
Shoulder, Overhead, Adolescent