Secret weapon for soccer stars? isometric calf raises may improve speed and agility

NCT ID NCT07482254

Completed Knowledge-focused Sponsor: The Jerzy Kukuczka Academy of Physical Education in Katowice Source: ClinicalTrials.gov ↗

First seen Jun 27, 2026 · Last updated Jul 16, 2026 · Updated 2 times

Summary

This study looks at whether doing isometric calf raises (holding a contraction without moving) can immediately improve sprinting, jumping, and change-of-direction performance in elite youth soccer players. Twelve male players aged 15-19 will do either the calf exercise or a light walk, then be tested on sprints and jumps. The goal is to see if this simple warm-up activity can give a short-term boost to explosive movements on the field.

What this could mean

Our plain-language read of the trial. This is informational only — not medical advice or a prediction.

Active substance: isometric conditioning activity (unilateral standing isometric calf raises)
What this could lead to: If it works, this could point toward a simple warm-up method to improve explosive performance in youth soccer players.
What could go wrong: This is a very small, early-stage study with only 12 participants, so results may not apply to all players. The effect is measured minutes after exercise, so long-term benefits are unknown.

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As listed by the trial registrant

The condition terms exactly as the trial's registrant entered them.

ATHLETIC PERFORMANCE ISOMETRIC STRENGTH TRAINING SOCCER

Contacts and locations

Locations

Academy of Physical Education in Katowice

Katowice, Silesian Voivodeship, 40-065, Poland

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