청소년 야구 투수의 구속과 운동학적 요인 및 악력의 상관관계 분석

Abstract

This study aimed to investigate the characteristic analysis among ball speed, kinematic variables and hand grip strength. We measured peak ball velocity using a radar gun and kinematic variables of the throwing arm using 10 electronically synchronized, high-speed digital cameras. We placed 40 reflective markers on anatomical landmarks of each participant to track 3-dimensional coordinate data. The average data from the 5 highest-velocity fastballs thrown for strikes were used for data analysis. A total of twenty-one baseball players were recruited for this study. All participants were analyzed about kinematic variables (Peak trunk rotation velocity, Peak pelvis rotation velocity, Shoulder range of motion, Shoulder internal rotation velocity, Elbow angle, and, Elbow extension velocity), Hand grip strength. For statistical analysis, Pearson coefficient correlation analysis was performed and the statistical significance level was set to 0.05. A positive correlation was found between ball velocity and peak trunk rotation velocity (r=.530; 95% p=.013) and ball velocity and shoulder range of motion (r=.526; 95% p=.014). However, no significant correlation were noted between ball velocity and peak pelvis rotation velocity (r=.212; 95% p=.356) or hand grip (r=.228; 95% p=.320). A positive correlation was present among ball velocity and peak trunk rotation velocity and shoulder range of motion. Therefore, it is necessary to focus on training to improve peak trunk rotation velocity and shoulder range of motion for the ball speed improvement for youth baseball pitcher.