Comparing contrast-relax stretching versus dymanic stretching on latissimus dorsi extensibility and throwing velosity in high school baseball players

Abstract

This study explores the effects of stretching latissimus dorsi flexibility on shoulder range of motion (ROM) and their effects on throwing velocity. Methods: Baseline measurements for ROM and throwing velocity were gathered in session one. During the second and third sessions, subjects performed general stretches followed by a series of dynamic (DYN) or contract-relax stretching (CRS) respectively. Post-intervention ROM and velocity measurements were taken. Our hypothesis was there would be no difference in ROM or throwing velocity based on stretching technique. Statistical Analysis: A repeated measures ANOVA was used for stretch comparison. Alpha level set at p <0.05. Results: Following stretching, no differences were seen for shoulder internal rotation ROM (p = 0.49); however, CRS showed difference for external rotation (p = 0.005) and flexion shoulder ROM (p = 0.001). CRS and DYN improved throwing velocity (p = 0.049). Conclusions: CRS improved ROM. CRS and DYN improved throwing velocity.