Can One-Legged isometric exercises boost soccer performance?
NCT ID NCT07556315
First seen Jun 27, 2026 · Last updated Jun 27, 2026
Summary
This study looked at whether adding isometric strength exercises (like holding a squat against a bar) to an 8-week training program helps youth soccer players jump higher, sprint faster, and get stronger. Forty-one male players aged 15-19 were split into groups doing unilateral (one leg) or bilateral (both legs) isometric exercises, or just the regular program. The goal was to see which type of training works best and whether it reduces strength differences between legs.
What this could mean
Our plain-language read of the trial. This is informational only, not medical advice or a prediction.
- Active substance
- isometric strength training exercises
- What this could lead to
- If it works, this could help coaches design better training programs to improve young soccer players' performance and reduce muscle imbalances.
- What could go wrong
- This is a small, early-stage study with only 41 male players, so results may not apply to females or other sports. The training is just 8 weeks, so long-term benefits are unknown.
This is an AI summary of the original study and may miss details. Read our disclaimer.
Study facts
What this study's own registry entry says, in plain language.
- Phase
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Not a phased trial
Phase numbers describe drug development. The registry uses this when they do not apply, as it does for trials of devices, procedures or behaviour changes, and for observational studies.
- Participants
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41 people
The number who actually took part.
- Started
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Sep 2025
- Finished
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Dec 2025
- Lead sponsor
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Other sponsor
The registry's catch-all category, for sponsors it does not file as a company, a government agency, or a research network.
Who can take part
This study's own entry requirements. Only the study team can say for certain whether you qualify.
- Ages
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14 to 19 years
- Sex
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Male participants only
- Healthy volunteers
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Accepted
You do not need to have the condition being studied to take part.
Show the full entry requirements Hide the full entry requirements
Copied word for word from the study's registry entry, so the wording is the study team's rather than ours.
Inclusion Criteria: * Male youth soccer players competing at the national level. * Age between 15 and 19 years. * Minimum of one year of resistance training experience. * Regular participation in organized soccer training and strength training. Exclusion Criteria: * Current neuromuscular or musculoskeletal injury or disorder. * Injury occurring during the intervention period preventing participation in training or testing. * Failure to complete the prescribed training program or attend at least 80% of training sessions. * Participation in additional resistance training programs outside the study protocol during the intervention period.
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As listed by the trial registrant
The condition terms exactly as the trial's registrant entered them.
Contacts and locations
Locations
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Academy of Physical Education in Katowice
Katowice, Silesian Voivodeship, 40-065, Poland
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