Brief 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 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.

Trial Health

Monitor

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Enrollment

participants targeted

Target at below P25 for not_applicable

Timeline

1mo left

Started Sep 2026

Shorter than P25 for not_applicable

Geographic Reach

1 country

1 active site

Status

not yet recruiting

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

Click on a node to explore related trials.

Study Timeline

Key milestones and dates

2 months study duration

Study Progress44%

Sep 2026Oct 2026

First Submitted

Initial submission to the registry

August 28, 2026

Completed

4 days until next milestone

First Posted

Study publicly available on registry

September 1, 2026

Completed

14 days until next milestone

Study Start

First participant enrolled

September 15, 2026

Completed

1 month until next milestone

Primary Completion

Last participant's last visit for primary outcome

October 15, 2026

Expected

15 days until next milestone

Study Completion

Last participant's last visit for all outcomes

October 30, 2026

Last Updated

September 1, 2026

Status Verified

August 1, 2026

Enrollment Period

1 month

First QC Date

August 28, 2026

Last Update Submit

August 28, 2026

Conditions

Visual Performance Heart Rate Response Judo Performance

Outcome Measures

Primary Outcomes (2)

Change in King-Devick Test Completion Time
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
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
Immediately before and immediately after each study condition (randori, yakusoku geiko, and control) during three separate testing sessions.