Asian Journal of Sports Medicine · 2012 · 12 citations · 17 references
It seems that a session of karate training does not result in renal damage and athletes can continue training after 6 hours.
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ACSM's advanced exercise physiology
Charles M. Tipton, Michael N. Sawka, Charlotte A. Tate et al. · Medical Entomology and Zoology · 2006 · 175 citations