Acute Effects of Randori and Yakusoku Geiko in Young Judokas
Trial statusNot yet recruiting
Trial phaseNot applicable
Trial typeInterventional
Biological sexMale
Age18-30
SponsorBogazici University
About this trial
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.
Eligibility criteria
This trial accepts healthy volunteersQualifiers
None
Disqualifiers
None
Trial design
Design model
Crossover
Treatments tested in this trial
Randori
BehavioralParticipants 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 Geiko
BehavioralParticipants 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.
Treatment groups
18 Participants
are divided into 6 treatment groups6
Treatment groupsSee each treatment group below.
Group A: Sequence 1: Randori → Yakusoku Geiko → ControlExperimental treatment 2 interventions
Group B: Sequence 2: Randori → Control → Yakusoku GeikoExperimental treatment 2 interventions
Group C: Sequence 3: Yakusoku Geiko → Randori → ControlExperimental treatment 2 interventions
Group D: Sequence 4: Yakusoku Geiko → Control → RandoriExperimental treatment 2 interventions
Group E: Sequence 5: Control → Randori → Yakusoku GeikoExperimental treatment 2 interventions
Group F: Sequence 6: Control → Yakusoku Geiko → RandoriExperimental treatment 2 interventions
Trial outcomes
Primary outcomes
1
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.2
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.Secondary outcomes
1
Change in Heart Rate
Time frame
Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.Sponsors and contacts
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Source ClinicalTrials.gov
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