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Can varying rest intervals boost strength in female athletes?

NCT ID NCT07785778

Knowledge-focused Sponsor: Birjand University of Medical Sciences 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 Results may not be published yet.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This status has not been confirmed recently, so it may be out of date.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 Aug 25, 2026 · Last updated Aug 26, 2026 · Updated 1 time

Summary

This trial tests three resistance training methods—traditional, standard cluster, and undulating cluster—in female volleyball players aged 18-30. Over eight weeks, participants train three times weekly, with blood samples and performance tests measuring strength, hormones, and inflammation. The goal is to see which method best improves upper-body strength and other athletic measures.

What this could mean

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

Active substance
Three resistance training methods: traditional, standard cluster, and undulating cluster
What this could lead to
If undulating cluster training proves superior, coaches may adopt it to boost upper-body strength in female athletes.
What could go wrong
The trial is small (30 participants) and short-term, so results may not apply broadly or show lasting effects.

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

30 people

The number who actually took part.

Started

Nov 2022

Finished

Dec 2022

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

18 to 30 years

Sex

Female 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: * Female volleyball players aged 18 to 30 years At least 2 years of continuous training in volleyball and resistance training Complete health status (based on health and wellness questionnaire results) No anterior cruciate ligament injury or other upper-/lower-extremity injuries in the past 6 months Familiarity with basic resistance training techniques Non-pregnant, with regular menstrual cycles No regular use of medications (including oral contraceptives) No use of ergogenic supplements affecting muscle mass (e.g., anabolic steroids, growth hormone, or insulin-like substances) in the 6 months prior to the study Exclusion Criteria: * Absence from more than three consecutive training sessions Any musculoskeletal injury that prevented continuation of the training program

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As listed by the trial registrant

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

Athletic performance Resistance training Volleyball players

Contacts and locations

Locations

  • Faculty of Sport Sciences, University of Birjand

    Birjand, South Khorasan Province, 9717434765, Iran

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