Resistance TrainingNCT06459050
Effects of Isometric Conditioning Activity on Subsequent Jumping Performance in Volleyball Players
A study testing Dominant Limb Overcoming Isometric Conditioning Activity and Non-dominant Limb Overcoming Isometric Conditioning Activity in people with Resistance Training, run by The Jerzy Kukuczka Academy of Physical Education in Katowice at 1 site in Poland.
Trial summary
The pairing of high-effort exercise, called conditioning activity, with a biomechanically similar high-velocity power movement is considered a valid method to effectively facilitate muscle power adaptations. Read more about this study
- Who is it for?
- Ages 18 to 35 years, men only
- Conditions the study is for
- Resistance Training
- What is being tested?
- Dominant Limb Overcoming Isometric Conditioning Activity and Non-dominant Limb Overcoming Isometric Conditioning Activity
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 20 participants
- Where
- 1 sitePoland
- Study dates
- 2 Apr 2023to 3 Jul 2023
- Phase
- Interventional
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 to 35 years
- Men only
- No healthy volunteers
- Adult
Who may be able to join
- no lower-limb serious injury, including tendon or muscle tear,
- participation in regular resistance training and competition.
- for the elite group participants competed at the highest national volleyball league for at least two consecutive seasons.
- for the amateur group participants competed in junior groups outside the highest league level.
Who cannot join
- -
Trial locations and contacts
1 site in 1 country.
Poland1 site
The Jerzy Kukuczka Academy of Physcial Education in Katowice
Katowice, Silesian Voivodeship, 40-065
About this study
Official title: Effects of Overcoming Isometric Unilateral Conditioning Activity on Subsequent Single-Leg Drop Jump in Elite and Amateur Volleyball Players
The pairing of high-effort exercise, called conditioning activity, with a biomechanically similar high-velocity power movement is considered a valid method to effectively facilitate muscle power adaptations. Research has mainly focused on using this method in exercises performed by both limbs, even though sports tasks are often executed through motion sequences produced by a single limb alternately. However, available studies have focused solely on the dominant leg, leaving it unclear if the effectiveness is similar in both legs and how it transfers between them. Therefore, this study aims to evaluate the immediate effects of the isometric split squat exercise on single-leg drop jump performance in volleyball players, considering their training status.
- Conditions
- Resistance Training
- Being tested
- Dominant Limb Overcoming Isometric Conditioning Activity, Non-dominant Limb Overcoming Isometric Conditioning Activity
- Keywords
- resistance training, strength and conditioning, physical activity, athletic performance
- Medical subject headings
- Motor Activity
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
Dominant Limb Overcoming Isometric Conditioning ActivityOther
Each session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by the dominant limb.
Non-dominant Limb Overcoming Isometric Conditioning ActivityOther
Each session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by non-dominant limb.
| Study group | Role | What they receive |
|---|---|---|
| Dominant Limb Conditioning Activity | Experimental | Each participant performed a single-leg drop jump for both the dominant and non-dominant limbs before and after completing the CA. Receives: Other: Dominant Limb Overcoming Isometric Conditioning Activity |
| Non-dominant Limb Conditioning Activity | Experimental | Each participant performed a single-leg drop jump for both the non-dominant and non-dominant limbs before and after completing the CA. Receives: Other: Non-dominant Limb Overcoming Isometric Conditioning Activity |
What is being measured
The primary outcome is the main question the study is designed to answer.
Drop Jump Height
Drop jump height estimated via take-off velocity performed on force plates. Participants performed 2 trials at each time-point.
Measured: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop Jump Contact Time
Drop jump contact time was estimated via time spent on the ground between drop and jump transition performed on force plates. Participants performed 2 trials at each time-point.
Measured: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop Jump Reactive Strength Index
Drop jump reactive strength index was estimated via jump height divided by the contact time performed on force plates. Participants performed 2 trials at each time-point.
Measured: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted14 Jun 2024
- Study start2 Apr 2023
- Primary completion5 Jun 2023
- Study completion3 Jul 2023
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Publications (1)Papers the sponsor has linked to this study.
- Other trials for Resistance TrainingStudies of the same condition, open and under way.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase N/A
- Primary purpose
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Crossover
- Model description
- The study was performed following a randomized, double-blind crossover design, where each participant performed two experimental sessions.
- Masking
- Double blind
- Who is masked
- Participant, Outcomes assessor
- Enrolment
- 20 participants (actual)
Sponsor and investigators
- Lead sponsor
- The Jerzy Kukuczka Academy of Physical Education in Katowice
- Sponsor type
- University, hospital or other
- Collaborators
- Charles University, Czech Republic, University School of Physical Education, Krakow, Poland
- Responsible party
- Principal investigator, Michal Krzysztofik, The Jerzy Kukuczka Academy of Physical Education in Katowice
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT06459050
- Sponsor's protocol ID
- PRIMUS 22/HUM/019
- Status last verified
- Jun 2024
- First submitted
- 10 Jun 2024
- Last updated
- 14 Jun 2024
- Results posted
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
Publications
Terbalyan A, Mikolajec K, Krzysztofik M, Urbanski R, Jarosz J, Stastny P, Spieszny M. Effects of overcoming isometric unilateral conditioning activity on subsequent single-leg drop jump in elite and amateur volleyball players: a randomized crossover trial. BMC Sports Sci Med Rehabil. 2025 Feb 28;17(1):30. doi: 10.1186/s13102-025-01083-9.
PubMed 40022177
Study at a glance
From the registry record, last updated by the sponsor on 14 Jun 2024. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Effects of Overcoming Isometric Unilateral Conditioning Activity on Subsequent Single-Leg Drop Jump in Elite and Amateur Volleyball Players
- ClinicalTrials.gov ID
- NCT06459050
- Acronym / sponsor ID
- PRIMUS 22/HUM/019
- Conditions
- Resistance Training
- Keywords
- resistance training, strength and conditioning, physical activity, athletic performance
- Study type
- Interventional
- Recruitment status
- Completed
- Enrolment
- 20 participants (actual)
- Lead sponsor
- The Jerzy Kukuczka Academy of Physical Education in KatowiceUniversity, hospital or other
- Collaborators
- Charles University, Czech Republic, University School of Physical Education, Krakow, Poland
- Study start
- 2 Apr 2023 (actual)
- Primary completion
- 5 Jun 2023 (actual)
- Study completion
- 3 Jul 2023 (actual)
- First posted
- 14 Jun 2024 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
The pairing of high-effort exercise, called conditioning activity, with a biomechanically similar high-velocity power movement is considered a valid method to effectively facilitate muscle power adaptations. Research has mainly focused on using this method in exercises performed by both limbs, even though sports tasks are often executed through motion sequences produced by a single limb alternately. However, available studies have focused solely on the dominant leg, leaving it unclear if the effectiveness is similar in both legs and how it transfers between them. Therefore, this study aims to evaluate the immediate effects of the isometric split squat exercise on single-leg drop jump performance in volleyball players, considering their training status.
Study design
- Primary purpose
- Treatment
- Allocation
- Non-randomised
- Intervention model
- Crossover
- Masking
- Double blind (participant, outcomes assessor)
- Number of arms
- 2
- Model description
- The study was performed following a randomized, double-blind crossover design, where each participant performed two experimental sessions.
| Arm | Type | Receives |
|---|---|---|
| Dominant Limb Conditioning Activity | Experimental | Other: Dominant Limb Overcoming Isometric Conditioning ActivityEach participant performed a single-leg drop jump for both the dominant and non-dominant limbs before and after completing the CA. |
| Non-dominant Limb Conditioning Activity | Experimental | Other: Non-dominant Limb Overcoming Isometric Conditioning ActivityEach participant performed a single-leg drop jump for both the non-dominant and non-dominant limbs before and after completing the CA. |
Who may qualify
- Ages
- 18 to 35 years
- Sex
- Male only
- Healthy volunteers
- Not accepted
- Age groups
- Adult
Key inclusion criteria (4 listed)
- no lower-limb serious injury, including tendon or muscle tear,
- participation in regular resistance training and competition.
- for the elite group participants competed at the highest national volleyball league for at least two consecutive seasons.
- for the amateur group participants competed in junior groups outside the highest league level.
Key exclusion criteria (1 listed)
- -
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| Dominant Limb Overcoming Isometric Conditioning ActivityEach session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by the dominant limb. | Other | Dominant Limb Conditioning Activity |
| Non-dominant Limb Overcoming Isometric Conditioning ActivityEach session involved performing 3 sets of 3-second overcoming isometric split squats with a 3-minute rest between sets as a conditioning activity performed by non-dominant limb. | Other | Non-dominant Limb Conditioning Activity |
Primary outcome
Drop Jump Height
Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop jump height estimated via take-off velocity performed on force plates. Participants performed 2 trials at each time-point.
Drop Jump Contact Time
Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop jump contact time was estimated via time spent on the ground between drop and jump transition performed on force plates. Participants performed 2 trials at each time-point.
Drop Jump Reactive Strength Index
Time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.
Drop jump reactive strength index was estimated via jump height divided by the contact time performed on force plates. Participants performed 2 trials at each time-point.
Results and safety
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 14 Jun 2024.
- Derived from this study: PubMed 40022177Terbalyan A, Mikolajec K, Krzysztofik M, Urbanski R, Jarosz J, Stastny P, Spieszny M. Effects of overcoming isometric unilateral conditioning activity on subsequent single-leg drop jump in elite and amateur volleyball players: a randomized crossover trial. BMC Sports Sci Med Rehabil. 2025 Feb 28;17(1):30. doi: 10.1186/s13102-025-01083-9.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
The record lists no contact. Use the official record to reach the sponsor.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Dominant Limb Overcoming Isometric Conditioning Activity and Non-dominant Limb Overcoming Isometric Conditioning Activity in people with Resistance Training, run by The Jerzy Kukuczka Academy of Physical Education in Katowice at 1 site in Poland.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 4 inclusion and 1 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: finished, as of the sponsor's last update on 14 Jun 2024. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Poland. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
Are results available for this study?
The study is completed, but results are not available in the source record. That does not mean the treatment did or did not work.
How can a doctor refer a patient or contact the research team?
The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Drop Jump Height (time frame: Immediately pre- and at 4th and 8th minute post-completion of conditioning activity.). The study lists 3 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
On the ClinicalTrials.gov record for NCT06459050, which also lists 1 linked publication.
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 14 Jun 2024.