Ninety-five high school baseball players (16 ± 1 years; 75 ± 13 kg; and 178 ± 20 cm) threw from flat-ground at distances of 9 m, 18 m, 27 m, 37 m, and 46 m while wearing a motusBASEBALLTM sensor (Motus Global, Massapequa, NY USA). Linear mixed-effects models and likelihood ratio tests were utilized to estimate the within-subject relationship between throwing distance and arm slot, arm speed, shoulder rotation, and elbow varus torque. Increases in throwing distance were accompanied by significant increases in varus torque (2 = 3509, p<0.01), arm speed (2 = 5144, p<0.01), and shoulder external rotation (2 = 3277, p<0.01) and significant decreases in arm slot (2 = 952, p<0.01). The use of longer distances for training and conditioning are shown to be beneficial in increasing shoulder rotation and arm speed; however, precaution needs to be taken when reaching maximum distances as there is a subsequent increase in elbow varus torque.
Dowling, Brittany; Owen, Caitlin; Tubbs, Travis; Dines, Joshua; and Camp, Christopher
"RELATIONSHIP OF THROWING ARM MECHANICS AND INTERVAL THORWING DISTANCE IN HIGH SCHOOL BASEBALL PLAYERS,"
ISBS Proceedings Archive: Vol. 35
, Article 67.
Available at: http://commons.nmu.edu/isbs/vol35/iss1/67