英文摘要
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Purpose: To analyze the number of adjustments of karate-gi and protective gears, adjustment time intervals of kumite contestants, and duration of bout in the world-class competitions in 2010 and 2012. World Karate Federation (WKF) has announced new regulations in 2011, such as wearing body protector, no extension, increase passivity fouls, etc., that may affect the number of adjustments of karate-gi and protective gears of kumite contestants and duration of bout. Methods: The subjects were the top 5 kumite contestants for all weight classes of the World Karate Championships in 2010 and 2012. By utilizing WKF official video analysis to compare the differences in the number of adjustments for karate-gi and protective gears, adjustment time intervals of kumite contestants, and duration of bout. Results: The average number of adjustments for karate-gi and protective gears in 2012 (male: 31.93 times; female: 22.43 times) which was higher than 2010 (male: 21.33 times; female: 15.57 times); the average adjustment time intervals in 2012 (male: 7.52 seconds; female: 8.03 seconds) which was more frequently than 2010 (male: 11.25 seconds; female: 11.56 seconds); the average duration of bout in 2012 (male: 6 minutes and 11 seconds; female: 4 minutes and 47 seconds) which was longer than 2010 (male: 5 minutes and 31 seconds; female: 4 minutes and 11 seconds). Compared to 2010, the average number of adjustments for body protection, karate-gi, belts, mitts, shin pads, and foot protection increased by 1.20, 2.15, 1.93, 3.46, 1.69, and 0.70 times in the men's group, and the women's group increased by 1.86, 0.57, 1.29, 3.36, 0.07, and 0.86 times, respectively in 2012. Conclusions: After the implementation of the new regulations in 2011, the number of adjustments of karate-gi and protective gears and duration of bout may be increased. Compared to 2010, the 2012 World Karate Championship has more adjustments in the number of karate-gi and protective gears, shorter adjustment time intervals, and longer duration of bout.
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