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Age-Group Differences in Ball Velocity and Spin Rate Among Youth Baseball Players: A Cross-Sectional Study Using a
Atsushi Ueda1, Yuki Takayama2, Naonori Takada2
1Department of Rehabilitation Sciences, Faculty of Allied Health Sciences,Kansai University of Welfare Sciences, Kashiwara, Japan.
International Journal of Sports Physiology and Performance
|March 30, 2026
Summary
Youth baseball players show increased ball velocity and spin rate with age. Body size associations with performance vary significantly across elementary, junior high, and senior high school levels.
Area of Science:
- Sports Science
- Biomechanics
- Youth Athletics
Background:
- Understanding how physical attributes influence baseball performance in youth is crucial for player development.
- Portable tracking devices offer new possibilities for field-based sports performance analysis.
Purpose of the Study:
- To document school-level variations in ball velocity and spin rate among young baseball players.
- To investigate the relationship between body size and these performance metrics across different age groups.
Main Methods:
- 438 players were categorized into elementary, junior high, and senior high school groups.
- Ball velocity and spin rate were measured using a portable Rapsodo device during maximal-effort throws.
- Pearson correlations examined the link between anthropometrics (height, body mass) and performance metrics.
Main Results:
- Significant differences in ball velocity and spin rate were observed across school levels (P < .001).
- Correlations between body size and performance metrics varied substantially by age group.
- The relationship between ball velocity and spin rate also differed, showing negative association in elementary players and positive in older groups.
Conclusions:
- Field-based testing revealed higher ball velocity and spin rate in older youth baseball players.
- Cross-sectional associations between body size and performance metrics differ across developmental stages.
- Further longitudinal research with standardized conditions is recommended to track individual player development.
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