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Related Experiment Video

Updated: May 28, 2026

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors

Construction of Constant-Load (Isotonic) and Constant-Velocity (Isokinetic) Torque-Velocity-Power Profiles In vivo for the Rat Plantar Flexors

Published on: October 3, 2025

Power-load curve in trained sprinters.

Pedro E Alcaraz¹, Salvador Romero-Arenas, Helena Vila

¹Kinesiology and Biomechanics Laboratory, Department of Physical Activity and Sport Sciences, San Antonio Catholic University of Murcia, Murcia, Spain. palcaraz@pdi.ucam.edu

Journal of Strength and Conditioning Research

|October 14, 2011

Summary

National level sprinters achieve peak power (PP) in a half squat at 60% of their one-repetition maximum (1RM). However, this peak power output was not significantly different across various loads and did not correlate with 60-m sprint performance.

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Area of Science:

Sports Science
Biomechanics
Athletic Performance

Background:

Lower-limb strength and power are critical differentiators in athletic performance, particularly in sprinting.
Understanding the relationship between power production and load is essential for optimizing training.

Purpose of the Study:

To define the power-load curve using a modified half squat in trained sprinters during their competitive cycle.
To investigate the correlation between peak power (PP) production and 60-m sprint performance.

Main Methods:

A cross-sectional study involving 10 national-level sprinters.
Determination of one-repetition maximum (1RM) followed by a progressive loading test (30-80% of 1RM) on a modified half squat machine.
Measurement of peak power (PP) output at each load during the concentric phase.

Main Results:

Peak power (PP) was observed at 60% of the one-repetition maximum (1RM).
No significant differences in power output were found between the tested loads (p ≤ 0.05).
No significant correlations were identified between peak power (PP) and 60-m sprint performance.

Conclusions:

National level sprinters in the competitive phase exhibit peak power (PP) around 60% of 1RM in the half squat exercise.
The power output at 60% 1RM was not significantly distinct from other tested loads.
Peak power output in the half squat exercise did not show a significant correlation with 60-m sprint performance in this cohort.