著者
小栗 和雄 加藤 義弘 黒川 淳一 井上 広国 渡辺 郁雄 松岡 敏男
出版者
日本体力医学会
雑誌
体力科學 (ISSN:0039906X)
巻号頁・発行日
vol.55, no.1, pp.155-164, 2006-02-01
参考文献数
39
被引用文献数
6 4

Masked obesity is the presence of obesity based on percent body fat (%BF) when the body mass index (BMI) shows an absence of obesity. To examine the relationship between masked obesity and arteriosclerosis risk factors, we compared both serum lipid levels and the prevalence of hyperlipidemia in male and female high school freshmen with and without masked obesity. Subjects consisted of 403 male and 326 female high school students aged 15〜16 years. Of these, 34 (8.4%) males and 36 (11.0%) females had masked obesity, defined as 17≦BMI<23.60 and %BF ≧25% in males, and 17≦BMI<24.17 and %BF≧30% in females, while the remaining 300 males and 246 females were not obese, having 17≦BMI<23.60 and %BF<25% and 17≦BMI<24.17 and %BF<30%, respectively. For both sexes, serum total-cholesterol (TC), low-density lipoprotein cholesterol (LDLC), triglycerides and the arteriosclerotic index (AI) were significantly higher (p<0.05〜0.01) in those with masked obesity. And many of the subjects with masked obesity had abnormal levels of TC, LDLC and AI, compared with those who were not obese (p<0.05〜0.01). Additionally, we compared both serum lipid levels and the prevalence of hyperlipidemia between subjects with masked obesity and control groups with the same BMI values. As a result, subjects with masked obesity had high serum lipid levels and a prevalence of hyperlipidemia. These results support the existence of masked obesity and suggest that masked obesity is associated with increased serum lipid levels, and thus could be a risk factor for arteriosclerosis in male and female high school freshmen.
著者
黒川 淳一 森川 薫博
出版者
一般社団法人日本機械学会
雑誌
日本機械学會論文集. B編 (ISSN:03875016)
巻号頁・発行日
vol.51, no.467, pp.2076-2083, 1985-07-25
被引用文献数
15

円管内の加速・減速流れにおける速度分布,遷移および管摩擦係数に及ぼす加速度の影響をおもに実験的に検討した.その結果,粘性の伝ぱ速度に対して加速が大の場合と小の場合では断面速度分布および遷移レイノルズ数が著しく異なり,層流加速域と乱流加速域では管摩擦係数の傾向が異なること,および減速流れではほぼ全期間を通じて乱流状態が保持され,管摩擦係数は準定常値より大きくなることなどを明らかにした.