Acute Effects of Randori and Yakusoku Geiko in Young Judokas
28 de agosto de 2026 actualizado por: Muhammed Sıddık Çemç, Bogazici University
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.
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.
Descripción general del estudio
Estado
Aún no reclutando
Intervención / Tratamiento
Tipo de estudio
Intervencionista
Inscripción (Estimado)
18
Fase
- No aplica
Contactos y Ubicaciones
Esta sección proporciona los datos de contacto de quienes realizan el estudio e información sobre dónde se lleva a cabo este estudio.
Estudio Contacto
- Nombre: Muhammed Sıddık Çemç, Dr.
- Número de teléfono: +90 537 016 29 25
- Correo electrónico: mscemc@gmail.com
Ubicaciones de estudio
-
-
Türkiye
-
Istanbul, Türkiye, Turquía (Türkiye), 34342
- Boğaziçi University
-
Contacto:
- Muhammed Sıddık Çemç, Dr.
- Número de teléfono: +90 537 016 29 25
- Correo electrónico: mscemc@gmail.com
-
Investigador principal:
- Muhammed Sıddık Çemç, Dr.
-
-
Criterios de participación
Los investigadores buscan personas que se ajusten a una determinada descripción, denominada criterio de elegibilidad. Algunos ejemplos de estos criterios son el estado de salud general de una persona o tratamientos previos.
Criterio de elegibilidad
Edades elegibles para estudiar
- Adulto
Acepta Voluntarios Saludables
Sí
Descripción
Inclusion Criteria:
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.
Exclusion Criteria:
Any known history of disease. Regular medication use. Failure to meet the study inclusion criteria.
Plan de estudios
Esta sección proporciona detalles del plan de estudio, incluido cómo está diseñado el estudio y qué mide el estudio.
¿Cómo está diseñado el estudio?
Detalles de diseño
- Propósito principal: Ciencia básica
- Asignación: Aleatorizado
- Modelo Intervencionista: Asignación cruzada
- Enmascaramiento: Ninguno (etiqueta abierta)
Armas e Intervenciones
Grupo de participantes/brazo |
Intervención / Tratamiento |
|---|---|
|
Experimental: Sequence 1: Randori → Yakusoku Geiko → Control
|
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.
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.
|
|
Experimental: Sequence 2: Randori → Control → Yakusoku Geiko
|
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.
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.
|
|
Experimental: Sequence 3: Yakusoku Geiko → Randori → Control
|
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.
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.
|
|
Experimental: Sequence 4: Yakusoku Geiko → Control → Randori
|
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.
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.
|
|
Experimental: Sequence 5: Control → Randori → Yakusoku Geiko
|
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.
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.
|
|
Experimental: Sequence 6: Control → Yakusoku Geiko → Randori
|
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.
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.
|
¿Qué mide el estudio?
Medidas de resultado primarias
Medida de resultado |
Periodo de tiempo |
|---|---|
|
Change in King-Devick Test Completion Time
Periodo de tiempo: 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.
|
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
Periodo de tiempo: 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.
|
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.
|
Medidas de resultado secundarias
Medida de resultado |
Periodo de tiempo |
|---|---|
|
Change in Heart Rate
Periodo de tiempo: Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.
|
Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.
|
Colaboradores e Investigadores
Aquí es donde encontrará personas y organizaciones involucradas en este estudio.
Patrocinador
Fechas de registro del estudio
Estas fechas rastrean el progreso del registro del estudio y los envíos de resultados resumidos a ClinicalTrials.gov. Los registros del estudio y los resultados informados son revisados por la Biblioteca Nacional de Medicina (NLM) para asegurarse de que cumplan con los estándares de control de calidad específicos antes de publicarlos en el sitio web público.
Fechas importantes del estudio
Inicio del estudio (Estimado)
15 de septiembre de 2026
Finalización primaria (Estimado)
15 de octubre de 2026
Finalización del estudio (Estimado)
30 de octubre de 2026
Fechas de registro del estudio
Enviado por primera vez
28 de agosto de 2026
Primero enviado que cumplió con los criterios de control de calidad
28 de agosto de 2026
Publicado por primera vez (Actual)
1 de septiembre de 2026
Actualizaciones de registros de estudio
Última actualización publicada (Actual)
1 de septiembre de 2026
Última actualización enviada que cumplió con los criterios de control de calidad
28 de agosto de 2026
Última verificación
1 de agosto de 2026
Más información
Términos relacionados con este estudio
Otros números de identificación del estudio
- E-84391427-050.04-297822
Plan de datos de participantes individuales (IPD)
¿Planea compartir datos de participantes individuales (IPD)?
NO
Descripción del plan IPD
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.
Información sobre medicamentos y dispositivos, documentos del estudio
Estudia un producto farmacéutico regulado por la FDA de EE. UU.
No
Estudia un producto de dispositivo regulado por la FDA de EE. UU.
No
Esta información se obtuvo directamente del sitio web clinicaltrials.gov sin cambios. Si tiene alguna solicitud para cambiar, eliminar o actualizar los detalles de su estudio, comuníquese con register@clinicaltrials.gov. Tan pronto como se implemente un cambio en clinicaltrials.gov, también se actualizará automáticamente en nuestro sitio web. .