Background and Study Aim: Head injuries have become a serious problem in judo. For people to safely enjoy judo and with peace of mind, it is important to clarify the causes of head injury and undertake safety measures. The cognitive purpose of this study is the effects of high-intensity exercise fatigue on the angular acceleration of the head in judo. Material and Methods: We included 15 male members of a university judo club. For high-intensity exercise, seoi-nage was performed once every 2.5 seconds. An angular velocity sensor was used to calculate the angular acceleration of the subjects` heads (200 Hz). Results: The maximum angular acceleration of the head immediately increased after high-intensity exercise (p<0.01). The forward flexion muscle strength of the neck increased (p<0.05) and the strength of posterior flexion did not change. Conclusions: Although the neck muscle strength was not reduced by high-intensity exercise, the maximum angular acceleration of the head increased, it may be related to the slow response of the neck muscle strength that is associated with head injury. Future safety measures should take into account that it is not enough to strengthen the neck muscle alone. Taking appropriate rest during exercise and not performing throwing exercises after high-intensity exercise will reduce the risk of head injury.
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