Body composition and resting metabolic rate of Japanese college Sumo wrestlers and non-athlete students : are Sumo wrestlers obese?

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概要

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• The body mass index [BMI = body weight/height2 (kg/m2)] is widely used as an indicator of obesity. However, BMI is not the best way to assess obesity, because obesity is an excess of body fat, not body weight. The difference between obesity assessments based on BMI and those based on the percentage of body fat (%Fat) causes problems in evaluating extraordinarily large people, such as Sumo wrestlers, who have both a large fat mass and a large muscle mass. We assessed obesity in male college Sumo wrestlers (n = 15) and non-athlete students (n = 20) using BMI and %Fat as reference indices. Anthropometric parameters and resting metabolic rate (in the sitting position) were measured. The mean body weight, BMI, and %Fat for Sumo wrestlers were 125.1 kg, 40.0, and 25.6%, respectively, which were extraordinarily high, as compared to non-athlete students (P < 0.01). All of the Sumo wrestlers were categorized as obese using the BMI criteria proposed by the World Health Organization: eight were `severely obese (35 ≤ BMI < 40) and seven were `very severely obese (BMI ≥ 40). However, only 40% of the wrestlers (n = 6) were categorized as obese when %Fat was used as the reference (%Fat > 25%). Furthermore, the body composition chart clearly showed that some Sumo wrestlers were no more adipose than the non-athlete students. Due to their remarkable muscle development, Sumo wrestlers have an excessive fat-free mass. Thus we conclude that it is necessary to consider both BMI and %Fat to assess obesity in excessively muscular people, such as Sumo wrestlers. Furthermore, we propose new criteria and methods for documenting obesity in Sumo wrestlers based on energy metabolism that considers physical activity and dietary intake.

• 日本人類学会の論文
• 2004-08-01

著者

• ABE Takashi

  Department of Somnology, Tokyo Medical University

• Yamauchi Taro

  東京大学 人類生態学

• Yamauchi Taro

  Department Of Human Ecology The University Of Tokyo

• MIDORIKAWA Taishi

  Department of Exercise and Sport Science, Tokyo Metropolitan University

• Yamauchi Taro

  Department Of Human Ecology Graduate School Of Medicine Hokkaido University

• Yamauchi Taro

  Department Of Human Ecology Graduate School Of Medicine The University Of Tokyo

• KONDO MASAKATSU

  Department of Exercise Physiology, Nihon University

• Kondo Masakatsu

  Department Of Exercise Physiology Nihon University

• Midorikawa Taishi

  Department Of Exercise And Sport Science Tokyo Metropolitan University

• Abe Takashi

  Department Of Bioscience Nagahama Institute Of Bio-science And Technology

• ABE Takashi

  Department of Biological Sciences, Graduate School of Science, University of Tokyo

• Abe Takashi

  Department of Biological Science, Faculty of Life and Environmental Science, Shimane University

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