[Aims] This study aimed to clarify difference between junior and senior sprinters in the relationship between physical resource and maximal running velocity. [Methods] Seventeen junior sprinters (Age 17.0 ± 0.9 years, 100m record 11.89 ± 0.49 s) and 23 senior sprinters (Age 20.8 ± 0.8 years, 100m record 11.07 ± 0.54 s) performed two 60-m sprint for determining maximal running velocity. Muscle volumes indices (MVIs) of lower extremity and trunk muscles were calculated from muscle thickness (Ultrasound) and limb length. A 10-s pedaling power was measured by electrical braked cycling ergometer, and normalized to body mass. The scores of counter movement jump, rebound jump, standing long jump and standing 5-step jump were also measured. [Results] Multiple regression analysis showed that standing 5-step jump and MVI of the psoas major were selected as explanatory variables for maximal running velocity in junior sprinters, but only pedaling power in senior sprinters. [Conclusion] The current study indicates that the relationship between physical resource and maximal running velocity differs between junior and senior sprinters: horizontal repeated jump performance and hip flexor muscle mass are mainly related to maximal running velocity in junior sprinters, whereas anaerobic power in senior sprinters.
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