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Abstract
In sports where an explosion of power or strength is necessary (e.g., weight lifting, tennis), athletes often yell or grunt to increase force production. Martial artists have used a similar technique for centuries called a kiap, but scientific evidence of its effectiveness is scarce. This study examined the effect of kiaping on strength and whether expertise influenced its effectiveness. Fifty (25 novices, 25 experts) martial artists completed a handgrip strength test under no kiap and kiap conditions. Performance for all participants was significantly better with the kiap (437.1 Newtons ± 94.9) than without (408.0 Newtons ± 90.6; p < .001).