Arm Stress Comparisons Between Common Baseball Pitch Types

Le résumé fourni par la source

The purpose of this study was to examine differences in varus arm stress between baseball pitch types — fastballs versus a breaking ball of choice—with MotusBASEBALL’s motion capture arm sleeve. Twenty-eight males between the ages of 18 and 36 (21.4 ± 4.3) were asked to throw ten pitches of each pitch type — fastballs (n = 28), curveballs (n = 14), sliders (n = 14), and changeups (n = 18). Every subject threw fastballs and a breaking ball of their choice, and some subjects threw additional changeups. Sliders had the highest arm stress (54.6 ± 12.9 N·m) while curveballs had the lowest (46.8 ± 16.3 N·m). Fastball arm stress was 50.1 ± 16.8 N·m and changeup arm stress was 51.3 ± 15.5 N·m. There was no statistically significant difference between pitch types and arm stress (p-value range 0.08-0.92), although the proportion of outlier readings for arm stress was significant for sliders (proportion of outliers: 34%, p-value: 0.009 versus change-ups; p-value: 0.014 versus curveballs). In addition, pitch type was significant only in determining the velocity reading from the Motus App (p-value <.0001), and was not significant in determining arm speed, arm slot, or shoulder rotation.

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