CompletedNot Applicable

Priming Magnitude and Retention in Highly Trained Male Volleyball Players

Poland14 participantsStarted 2026-01-05

Plain-language summary

This study examined whether a short, high-intensity isometric exercise can influence physical performance and muscle characteristics several hours after it is performed. Specifically, the study compared the effects of a maximal isometric conditioning activity with a typical volleyball-specific warm-up routine. Highly trained male volleyball players participated in the study. Each participant completed two experimental conditions in a randomized crossover design: (1) a maximal isometric conditioning activity and (2) a volleyball-specific warm-up used as a control condition. The researchers evaluated changes in countermovement jump performance, muscle viscoelastic properties of the rectus femoris, and skin surface temperature over the quadriceps muscle. Measurements were taken before the intervention and again 6 hours and 30 hours later to determine whether the conditioning activity produced delayed improvements in neuromuscular performance. Understanding these delayed effects may help coaches and athletes optimize training and competition preparation strategies. The results of this study may provide insights into whether specific conditioning exercises can enhance or maintain explosive performance in volleyball players several hours after they are performed.

Who can participate

Sex

MALE

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.

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.

Questions worth asking your doctor

Bring these to your next appointment. They're a starting point for a shared conversation — not a sign you qualify or a recommendation to enrol.

1Based on my diagnosis and history, is this trial worth exploring for me — or is there a standard treatment we should try first?
2What does this trial's phase tell us about how much is already known about its safety and benefit?
3What would taking part actually involve for me — visits, tests, time, and travel?
4What are the known and possible risks or side effects I should weigh, and how would they be monitored?
5If this trial isn't the right fit, what other options or trials would you suggest I look into?

Generated to help you prepare — always confirm anything about your own eligibility and care with the study team and your doctor.

Questions for the trial coordinator

The trial coordinator is the person who runs the study day to day. These cover the practical side — logistics, costs, and what taking part would actually mean for your life. The study team confirms whether you meet the criteria; these are questions to ask, not a sign you qualify.

1What does taking part actually involve week to week — how many visits, where, and how long does each one take?
2What costs are covered by the study, and what might I have to pay for myself, including travel, parking, or time off work?
3What happens during screening, and what happens if the study team confirms I don't meet the criteria after those tests?
4Who pays for the scans, blood work, and other tests the trial requires — the study, my insurance, or me?
5How will being in the trial affect my regular care, and will my own doctor stay informed and involved?
6Can I leave the trial at any point if I change my mind, and what would happen to my care if I do?

A starting point for the conversation — always confirm anything about your own eligibility, costs, and care with the study team and your doctor.

What they're measuring

Countermovement Jump Height (cm)

Timeframe: Baseline, 6 and 30 hours post-intervention

Trial details

NCT IDNCT07483931

SponsorThe Jerzy Kukuczka Academy of Physical Education in Katowice

Sponsor typeOTHER

Study typeINTERVENTIONAL

Primary completion2026-01-17

View on ClinicalTrials.gov More Athletic Performance trials

Plain-language summary

Who can participate

Sex

MALE

See this in plain English?

AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.