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Volleyball Players' jump power may get a delayed boost from isometric exercise

NCT ID NCT07483931

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
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 This study
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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Jun 27, 2026 · Last updated Jun 27, 2026

Summary

This study tested whether a brief, intense isometric exercise could improve jump performance in highly trained male volleyball players several hours later. Fourteen players did either the isometric exercise or a standard warm-up, and their jump height was measured before, 6 hours after, and 30 hours after. The goal was to see if the isometric activity caused a delayed performance boost, which could help athletes plan training and competition warm-ups.

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 (ICA)
What this could lead to
If successful, this could help coaches and athletes design better warm-up routines to improve explosive performance hours before competition.
What could go wrong
This is a small, early-stage study with only 14 participants. Results may not apply to other sports or athletes, and the effect may be minimal or not reproducible.

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

14 people

The number who actually took part.

Started

Jan 2026

Finished

Jan 2026

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

Contacts and locations

Locations

  • Academy of Physical Education in Katowice

    Katowice, Silesian Voivodeship, 40-065, Poland

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