Vanaf 24 tot 27 juni zal alweer de 20e editie van het ECSS congres plaats vinden in Malmo, Zweden. Op het congress zal project FASTBALL ook aanwezig zijn. Op de website van het congres staat nu ook de volledige agenda. Als je heeeeel goed zoekt kan je Femke hier op terug vinden. Hier haar abstract over de poster die ze mag presenteren zoals gepubliceerd op de congres website:
THE RELATIONSHIP OF SHOULDER MAXIMAL EXTERNAL ROTATION RANGE OF MOTION ON BALL-THROWING SPEED IN YOUTH BASEBALL PITCHERS
Introduction
To pitch a baseball high rotational forces are needed. Repetitive pitching at high velocities leads to adaptations in the shoulder complex of the throwing arm. Several authors have documented that the throwing shoulder in overhead-athletes exhibits significantly more external rotation and significantly reduced internal rotation when compared to the non-throwing shoulder or to non-overhead-throwing athletes (Ellenbecker et al., 2002; Sauers et al., 2014; Wilk et al. 2011). A lot of research into this subject has been done in relation to injuries. The purpose of this study was to see if there is a relation between maximal external rotation of the throwing arm and throwing velocity.
Methods
As a part of a larger study maximal external rotation range of motion of the throwing shoulder was measured using a digital inclinometer in a group of 61 Dutch male youth baseball pitchers. All participants were members of the six talent academies of the Dutch baseball federation and were playing in the Aspirant and Junior Elite League. Throwing velocity was measured using a radar gun and the average of ten subsequent throws was calculated. Measurements were taken in October at the end of the game season. Linear regression analyses were performed to explore the relation between maximal external rotation of the throwing arm and throwing velocity.
Results
The throwing velocity of this group of young pitchers was on average 67.6 (SD 6.2) miles per hour (mph) with a range of 54-80 mph. The average maximal degree of external rotation of their throwing arm was 116.1 (SD 19.8) degrees with a range of 44-169 degrees. Linear regression analysis showed that maximal external rotation was not significantly associated with throwing velocity (regression coefficient 0.008 mph/degree, 95% confidence interval [-0.073, 0.090]). Adding the age groups to the regression model did not change this finding substantially (regression coefficient 0.013 mph/degree, 95% confidence interval [-0.053, 0.078]). However, this final model showed that junior pitchers on average throw 7.6 mph (95% confidence interval [5.0, 10.2]) faster than aspirants.
Conclusion
The amount of maximal external rotation was not significantly related to the throwing velocity of youth baseball pitchers.
References
– Ellenbecker T.S., Roetert E.P., Bailie D.S., Davies G.J., Brown S.W. (2002). Med Sci Sports Exerc. 34(12), 2052-2056.
– Sauers E.L., Huxel Bliven K.C., Johnson M.P., Falsone S., Walters S. (2014). Am J Sports Med. 42(2), 430-436.
– Wilk K.E., Macrina L.C., Fleisig G.S., Porterfield R., Simpson II C.D., Harker P., Paparesta N., Andrews J.R. (2011). Am J Sports Med. 39(2), 329-335.
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