# Biomechanical Differences Among Collegiate Sprinters Developed Through Specialized and Diversified Training Pathways

## TL;DR

Specialized training in sprinters improves neuromuscular reactivity and jump efficiency more than diversified training, with implications for optimizing training methods.

## Contribution

Identifies biomechanical and neuromuscular differences between sprinters from specialized and diversified training pathways in collegiate athletes.

## Key findings

- Specialized training leads to faster force production and better stretch–shortening cycle performance in sprinters.
- Diversified training groups showed comparable peak torque but lower reactive strength and leg stiffness.
- Electromyography patterns and balance performance varied between the two training pathways.

## Abstract

What are the main findings?
Sprinters following a specialized athletic development pathway exhibited faster force production timing (shorter time-to-peak torque) in the nondominant knee extensors, while peak torque was comparable to peers following a diversified physical education-centered pathway.Sprinters following a specialized athletic development pathway demonstrated superior stretch–shortening cycle performance (higher reactive strength index, shorter ground contact time, greater leg stiffness) together with phase-specific electromyography differences during drop jumps.

Sprinters following a specialized athletic development pathway exhibited faster force production timing (shorter time-to-peak torque) in the nondominant knee extensors, while peak torque was comparable to peers following a diversified physical education-centered pathway.

Sprinters following a specialized athletic development pathway demonstrated superior stretch–shortening cycle performance (higher reactive strength index, shorter ground contact time, greater leg stiffness) together with phase-specific electromyography differences during drop jumps.

What are the implications of the main findings?
The sprint-performance advantage associated with specialized training appears to be linked more to neuromuscular reactivity/coordination and stretch–shortening cycle efficiency than to leg maximal strength (as indexed by isokinetic peak torque at 60°/s), suggesting that training should prioritize rapid force generation and efficient elastic energy utilization.For participants following a diversified physical education-centered pathway, training should emphasize reactive strength development (plyometrics with short ground contact time) and sensorimotor/postural-control work to enhance rapid force transfer and narrow performance gaps.

The sprint-performance advantage associated with specialized training appears to be linked more to neuromuscular reactivity/coordination and stretch–shortening cycle efficiency than to leg maximal strength (as indexed by isokinetic peak torque at 60°/s), suggesting that training should prioritize rapid force generation and efficient elastic energy utilization.

For participants following a diversified physical education-centered pathway, training should emphasize reactive strength development (plyometrics with short ground contact time) and sensorimotor/postural-control work to enhance rapid force transfer and narrow performance gaps.

This study compared collegiate sprinters from two common admission routes in China to identify pathway-associated differences that may inform subsequent training for athletes entering via the Physical Education College Entrance Examination pathway. Twenty male collegiate sprinters were allocated to a Sports Independent Enrollment group and a Physical Education College Entrance Examination group, with ten participants in each. Participants completed isokinetic knee testing, drop jump tests, static balance tests, and drop jump electromyography assessment. Isokinetic outcomes were largely comparable between groups, although the Sports Independent Enrollment group showed faster time to reach peak torque in the nondominant-side knee extensors. In drop jumps, the Sports Independent Enrollment group demonstrated higher reactive strength, shorter ground contact time, greater leg stiffness normalized to body weight, and shorter propulsion duration. Electromyography patterns differed between groups across movement phases. Balance differences were mainly observed under the single-leg eyes-closed condition in unadjusted comparisons, but none remained significant after false discovery rate adjustment. Overall, between-group differences were more evident in rapid force production and neuromuscular control than in the magnitude of isokinetic strength. These findings provide practical targets for designing subsequent training priorities for athletes entering through the Physical Education College Entrance Examination pathway.