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One-Legged squats may boost volleyball jumps better than Two-Legged squats, study hints

NCT ID NCT07709104

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

What the study statuses mean

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Recruitment status, easiest to join first

Recruiting now
This trial is taking on new participants right now.
Not yet recruiting
Registered, but not yet taking participants.
By invitation only This study
Not open to general applications. Only people the study team invites can take part.
Paused
Paused for now. It may or may not start again.
Ongoing
Running, but no longer taking on new participants.
Completed
The trial has finished. Results may not be published yet.
Stopped early
Stopped early, before it reached the end. That can be for many reasons, including safety.
Cancelled
Cancelled before anyone took part.

Expanded access (not trials)

Expanded access
Not a trial. This treatment can be requested outside a study, case by case, for people who qualify.
Expanded access (paused)
Not a trial. The treatment can normally be requested outside a study, but is unavailable right now.
Expanded access (ended)
Not a trial. The treatment could once be requested outside a study, but no longer can.
Approved
The treatment has been approved, so it is available normally rather than through this programme.

When the status isn't known

Details not published
The full record has not been published yet, so there is little to show here.
Status unknown
This status has not been confirmed recently, so it may be out of date.

First seen Jul 16, 2026 · Last updated Jul 17, 2026 · Updated 1 time

Summary

This study tests whether doing isometric squats with one leg at a time or both legs together improves jump height in highly trained male volleyball players. Fourteen athletes will perform bilateral squats, unilateral squats, or a light walk, then have their jump performance measured at several time points. The goal is to see which type of warm-up leads to better jumping, and whether the effect differs for two-legged versus one-legged jumps.

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 (bilateral or unilateral isometric squat contractions)
What this could lead to
If it works, this could help coaches and athletes choose the best warm-up strategy to improve jump performance in volleyball.
What could go wrong
This is a small, early-stage study with only 14 highly trained athletes, so results may not apply to other groups or real-game settings.

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

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

About 14 people

The number the study aims to enrol. It can still change while the study runs.

Expected to start

Jul 2026

An estimate. Start dates often move.

Expected to finish

Aug 2026

An estimate. End dates often move.

Lead sponsor

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

Children (under 18), adults (18 to 64) and older adults (65 and over)

Sex

Male participants only

Healthy volunteers

Accepted

You do not need to have the condition being studied to take part.

Show 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: * minimum of 7 years of systematic volleyball training, * at least 3 resistance training sessions per week during the preceding 5 years, * no musculoskeletal injury requiring training cessation longer than 4 weeks within 6 months prior to enrollment, * absence of tattoos over the rectus femoris muscle that could interfere with thermographic assessment. Exclusion Criteria: * less than 7 years of systematic volleyball training, * less than 3 resistance training sessions per week during the previous 5 years, * any musculoskeletal injury within the 6 months prior to enrollment that required cessation of training for longer than 4 weeks, * current musculoskeletal pain or injury that could affect jumping performance or participation in maximal isometric exercise, * tattoos, scars, or skin conditions over the rectus femoris muscle that could interfere with thermographic measurements, * use of medications or substances that may affect neuromuscular performance or muscle function, * failure to comply with study procedures or testing requirements.

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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 Post activation potentiation Volleyball

How to take part

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  1. The places running it

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  2. The official record

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Contacts and locations

Locations

  • Academy of Physical Education in Katowice

    Katowice, Silesian Voivodeship, 40-065, Poland

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