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The purpose of this study was to examine the relationship of intersegmental power with elbow valgus load during pitching in adult baseball players. Kinematic and kinetic data from 24 male baseball pitchers (college n = 8; professional n = 16) were analysed using marker-based motion analysis and multiple linear regression. The segmental powers delivered by trunk rotation and shoulder internal rotation torques in the arm cocking phase accounted for 72% of the variance in peak elbow valgus torque (r = .848, p < 0.01). Furthermore, the power supplied by trunk rotation was the only significant predictor of ball speed (r = .840, p < 0.01). This segmental power analysis reinforces evidence that the rotational torques at the trunk and shoulder have the greatest effect on the development of elbow valgus load.