Visual PerformanceNCT07798622
Acute Effects of Randori and Yakusoku Geiko in Young Judokas
A study testing Randori and Yakusoku Geiko in people with Visual Performance and Heart Rate Response, run by Bogazici University at 1 site in Turkey (Türkiye).
Trial summary
This study will compare the immediate effects of two common judo practice methods, randori and yakusoku geiko, on visual-motor performance and heart rate in young male judokas. Randori is a free-practice form of judo that involves active resistance and unpredictable interaction with an opponent, whereas yakusoku geiko… Read more about this study
- Who is it for?
- Ages 18 to 30 years, men onlyHealthy volunteers can take part
- Conditions the study is for
- Visual Performance, Heart Rate Response, Judo Performance
- What is being tested?
- Randori and Yakusoku Geiko
- Type of treatment
- Lifestyle or therapy programme
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 18 participants
- Where
- 1 siteTurkey (Türkiye)
- Study dates
- 15 Sep 2026to 30 Oct 2026
- Phase
- Interventional
- Are there results?
- Not yet: the study is under way
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 30 years
- Men only
- Healthy volunteers accepted
- Adult
Who may be able to join
- Male participants. Licensed judo athletes residing in Istanbul. Regular participation in judo training at least three days per week. Willingness to provide informed consent. Willingness to avoid high-intensity exercise during the 24 hours before each testing session.
Who cannot join
- Any known history of disease. Regular medication use. Failure to meet the study inclusion criteria.
Trial locations and contacts
1 site in 1 country. Contact the study team or a site near you to ask about taking part.
Turkey (Türkiye)1 site
Boğaziçi University
Istanbul, Türkiye, 34342
Muhammed Sıddık Çemç, Dr., +90 537 016 29 25, mscemc@gmail.com
Muhammed Sıddık Çemç, Dr.
About this study
Official title: Comparison of the Acute Effects of Randori and Yakusoku Geiko on Visual-Motor Performance and Heart Rate in Young Judokas
This study will compare the immediate effects of two common judo practice methods, randori and yakusoku geiko, on visual-motor performance and heart rate in young male judokas. Randori is a free-practice form of judo that involves active resistance and unpredictable interaction with an opponent, whereas yakusoku geiko is a more controlled practice method in which techniques are performed with less resistance.
The study will use a randomized, counterbalanced crossover design. The same participants will complete three conditions on separate days: randori, yakusoku geiko, and a seated rest control condition. The order of these conditions will be randomized, and there will be at least 48 hours between sessions.
Read more
Before and immediately after each condition, visual-motor performance will be assessed using the King-Devick Test, a rapid number-naming task that measures visual scanning, attention, and eye movement-related performance. Heart rate will also be measured before and immediately after each condition using a Polar H10 chest strap.
Randori and yakusoku geiko will each be performed for 4 minutes after a standardized warm-up. During the control condition, participants will rest for 4 minutes without performing physical activity. The study will examine whether these different judo practice conditions produce different immediate changes in King-Devick Test completion time, error count, and heart rate.
- Conditions
- Visual Performance, Heart Rate Response, Judo Performance
- Being tested
- Randori, Yakusoku Geiko
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
RandoriBehavioural
Participants will complete a 4-minute randori session following an approximately 15-minute standardized warm-up. Randori will involve free judo practice with active resistance and unpredictable interaction between matched training partners. Participants will be paired with consideration of weight category and belt level.
Yakusoku GeikoBehavioural
Participants will complete a 4-minute yakusoku geiko session following an approximately 15-minute standardized warm-up. Yakusoku geiko will involve controlled and repetitive judo technique practice with little or no active resistance from the training partner. Participants will be paired with consideration of weight category and belt level.
| Study group | Role | What they receive |
|---|---|---|
| Sequence 1: Randori → Yakusoku Geiko → Control | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
| Sequence 2: Randori → Control → Yakusoku Geiko | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
| Sequence 3: Yakusoku Geiko → Randori → Control | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
| Sequence 4: Yakusoku Geiko → Control → Randori | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
| Sequence 5: Control → Randori → Yakusoku Geiko | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
| Sequence 6: Control → Yakusoku Geiko → Randori | Experimental | Not described Receives: Behavioral: Randori; Behavioral: Yakusoku Geiko |
What is being measured
The primary outcome is the main question the study is designed to answer.
Change in King-Devick Test Completion Time
Measured: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions, with 48 hours to 7 days between sessions.
Change in King-Devick Test Error Count
Measured: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions, with 48 hours to 7 days between sessions.
Secondary outcomes (1)
Change in Heart Rate
Measured: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted1 Sep 2026
- Study start15 Sep 2026 (estimated)
- Primary completion15 Oct 2026 (estimated)
- Study completion30 Oct 2026 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Visual PerformanceStudies 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
- Basic science
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Enrolment
- 18 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Bogazici University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Muhammed Sıddık Çemç, Bogazici University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT07798622
- Sponsor's protocol ID
- E-84391427-050.04-297822
- Status last verified
- Aug 2026
- First submitted
- 28 Aug 2026
- Last updated
- 1 Sep 2026
- Results posted
- No
- Data monitoring committee
- No
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- No: Individual participant data will not be shared because no formal data-sharing plan has been established for this study. Study findings will be reported in aggregate form in scientific publications and presentations.
Study at a glance
From the registry record, last updated by the sponsor on 1 Sep 2026. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Comparison of the Acute Effects of Randori and Yakusoku Geiko on Visual-Motor Performance and Heart Rate in Young Judokas
- ClinicalTrials.gov ID
- NCT07798622
- Acronym / sponsor ID
- E-84391427-050.04-297822
- Conditions
- Visual Performance, Heart Rate Response, Judo Performance
- Study type
- Interventional
- Recruitment status
- Not yet recruiting
- Enrolment
- 18 participants (estimated)
- Lead sponsor
- Bogazici UniversityUniversity, hospital or other
- Study start
- 15 Sep 2026 (estimated)
- Primary completion
- 15 Oct 2026 (estimated)
- Study completion
- 30 Oct 2026 (estimated)
- First posted
- 1 Sep 2026 (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.
This study will compare the immediate effects of two common judo practice methods, randori and yakusoku geiko, on visual-motor performance and heart rate in young male judokas. Randori is a free-practice form of judo that involves active resistance and unpredictable interaction with an opponent, whereas yakusoku geiko is a more controlled practice method in which techniques are performed with less resistance.
The study will use a randomized, counterbalanced crossover design. The same participants will complete three conditions on separate days: randori, yakusoku geiko, and a seated rest control condition. The order of these conditions will be randomized, and there will be at least 48 hours between sessions.
Before and immediately after each condition, visual-motor performance will be assessed using the King-Devick Test, a rapid number-naming task that measures visual scanning, attention, and eye movement-related performance. Heart rate will also be measured before and immediately after each condition using a Polar H10 chest strap.
Randori and yakusoku geiko will each be performed for 4 minutes after a standardized warm-up. During the control condition, participants will rest for 4 minutes without performing physical activity. The study will examine whether these different judo practice conditions produce different immediate changes in King-Devick Test completion time, error count, and heart rate.
Study design
- Primary purpose
- Basic science
- Allocation
- Randomised
- Intervention model
- Crossover
- Masking
- None (open label)
- Number of arms
- 6
| Arm | Type | Receives |
|---|---|---|
| Sequence 1: Randori → Yakusoku Geiko → Control | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
| Sequence 2: Randori → Control → Yakusoku Geiko | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
| Sequence 3: Yakusoku Geiko → Randori → Control | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
| Sequence 4: Yakusoku Geiko → Control → Randori | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
| Sequence 5: Control → Randori → Yakusoku Geiko | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
| Sequence 6: Control → Yakusoku Geiko → Randori | Experimental | Behavioral: Randori, Behavioral: Yakusoku Geiko |
Who may qualify
- Ages
- 18 to 30 years
- Sex
- Male only
- Healthy volunteers
- Accepted
- Age groups
- Adult
Key inclusion criteria (1 listed)
- Male participants. Licensed judo athletes residing in Istanbul. Regular participation in judo training at least three days per week. Willingness to provide informed consent. Willingness to avoid high-intensity exercise during the 24 hours before each testing session.
Key exclusion criteria (1 listed)
- Any known history of disease. Regular medication use. Failure to meet the study inclusion criteria.
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 |
|---|---|---|
| RandoriParticipants will complete a 4-minute randori session following an approximately 15-minute standardized warm-up. Randori will involve free judo practice with active resistance and unpredictable interaction between matched training partners. Participants will be paired with consideration of weight category and belt level. | Behavioural | Sequence 1: Randori → Yakusoku Geiko → Control, Sequence 2: Randori → Control → Yakusoku Geiko, Sequence 3: Yakusoku Geiko → Randori → Control, Sequence 4: Yakusoku Geiko → Control → Randori, Sequence 5: Control → Randori → Yakusoku Geiko, Sequence 6: Control → Yakusoku Geiko → Randori |
| Yakusoku GeikoParticipants will complete a 4-minute yakusoku geiko session following an approximately 15-minute standardized warm-up. Yakusoku geiko will involve controlled and repetitive judo technique practice with little or no active resistance from the training partner. Participants will be paired with consideration of weight category and belt level. | Behavioural | Sequence 1: Randori → Yakusoku Geiko → Control, Sequence 2: Randori → Control → Yakusoku Geiko, Sequence 3: Yakusoku Geiko → Randori → Control, Sequence 4: Yakusoku Geiko → Control → Randori, Sequence 5: Control → Randori → Yakusoku Geiko, Sequence 6: Control → Yakusoku Geiko → Randori |
Primary outcome
Change in King-Devick Test Completion Time
Time frame: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions, with 48 hours to 7 days between sessions.
Change in King-Devick Test Error Count
Time frame: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions, with 48 hours to 7 days between sessions.
1 secondary outcome
Change in Heart Rate
Time frame: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.
Results and safety
This study is still under way. Results are not available in the source record yet.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 1 Sep 2026.
- Individual participant dataSharing planned: No. Individual participant data will not be shared because no formal data-sharing plan has been established for this study. Study findings will be reported in aggregate form in scientific publications and presentations.
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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.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A study testing Randori and Yakusoku Geiko in people with Visual Performance and Heart Rate Response, run by Bogazici University at 1 site in Turkey (Türkiye).
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 1 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: opening soon, as of the sponsor's last update on 1 Sep 2026. 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 Turkey (Türkiye). 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?
This study is still under way. Results are not available in the source record yet.
How can a doctor refer a patient or contact the research team?
Contact Muhammed Sıddık Çemç, Dr. (+90 537 016 29 25, mscemc@gmail.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
Change in King-Devick Test Completion Time (time frame: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions, with 48 hours to 7 days between sessions.). The study lists 2 primary outcomes in all. It is what the study was designed to measure, not a finding.
Where can I read the original study information?
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 1 Sep 2026.