PENGARUH KEKUATAN LENGAN, KETEBALAN LEMAK, DAN BODY MASS INDEX TERHADAP PRESTASI RENANG GAYA CRAWL 50 METER

The objective of this research study is to reveal the influences of pull and push strength of arms, skin fold thickness, and body mass index towards 50-meter-crawl-style swimming achievements. The results of this research are expected to reveal the factors influencing the achievement on swimming, especially in the crawl style. This research used the survey method. The populations involved in this research were the athletes of Tirta Alvita Swimming Association under PRSI D.I. Yogyakarta (National Swimming Association Yogyakarta). The populations of this research were 8 athletes who were also the samples of this research since it used the total sample technique. The instruments used in this research were 1) pull and push strength test dynamometer to measure the arm strength in pulling and pushing, 2) skin fold thickness to measure fat thickness, 3) body mass index of ideal body weight to measure body height and weight, and 4) the achievements in 50-meter-crawl-style swimming taken from the latest swimming championship held in Tirta Kembar swimming pool, Purwokerto on 29 August 2006. The results of this research show that: 1) there were no significant influences of the pulling and pushing strength to the achievement of 50-meter- crawl-style swimming, demonstrated by the coefficient of determinant (R) 0.165; 2) there were no significant influences of skin fold thickness to the achievement of 50-meter- crawl-style swimming demonstrated by the coefficient of determinant (R) 0.085; 3) there were significant influences of body mass index to the achievement of 50-meter- crawl-style swimming demonstrated by the coefficient of determinant (R) 0.008. Key words: swimming, the pulling and pushing strength, skin fold thickness,, body mass inde