著者

下門 洋文 中田 由夫 富川 理充 高木 英樹 征矢 英昭

出版者

一般社団法人 日本体育・スポーツ・健康学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.58, no.1, pp.181-194, 2013 (Released:2013-06-08)

参考文献数

34

被引用文献数

4 3

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The purpose of this study was to examine trends in the body mass index (BMI) and physical fitness of Japanese university students over a period of 26 years and the association between these parameters. We retrospectively collected data on 17,514 students aged 18-19 years attending a university in the years 1984, 1986, 1990, 1991, 1996, 1997, and 2004-2010. The subjects were classified into three body types on the basis of calculated BMI: underweight (BMI<18.5), normal (18.5≤BMI<25), and overweight (BMI≥25). We also calculated the physical fitness score on the basis of 4 fitness-test results (hand-grip power, handball throwing distance, 50-m running time, and 20-m shuttle run count). The time of assessment was categorized into three periods: 1980s (1984 and 1986), 1990s (1990, 1991, 1996, and 1997), and 2000s (2004-2010). The association of physical fitness with body type and period was analyzed using 2-factorial analysis of variance. Descriptive statistics showed that over the 26-year period, moderately increases in the prevalence of underweight and overweight individuals were observed, and the fitness score decreased for both sexes and all body types. A significant interaction between body type and period on physical fitness was observed in boys (P<0.05); underweight and overweight boys showed a greater decrease in physical fitness than normal-weight boys from the 1990s to the 2000s. These long-term data suggest that over 26 years, an increase in the prevalence of underweight and overweight individuals among university students resulted in a decrease in fitness levels to a greater extent in boys.

著者

小林 啓介 下門 洋文 高木 英樹 椿本 昇三 仙石 泰雄

出版者

一般社団法人 日本体育学会

雑誌

体育学研究 (ISSN:04846710)

巻号頁・発行日

vol.61, no.1, pp.185-195, 2016 (Released:2016-06-17)

参考文献数

29

被引用文献数

2

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The purpose of this study was to clarify the pattern of muscular activity in the trunk, thigh and lower leg during the underwater dolphin kick in elite female competitive swimmers. The participants were 9 national-level competitive female swimmers who performed underwater dolphin kick swimming for 15 m at maximum effort. Sagittal movement was recorded for 2-D motion analysis, and surface electromyographic (EMG) data were recorded from 6 muscles: rectus abdominis (RA), elector spinae (ES), rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius (GAS). The EMG data were used to investigate the active phase during one kick cycle. Furthermore, the co-active phases between the agonist and the antagonist in the trunk, thigh and lower leg were evaluated in terms of estimated muscular coordination. The kinematic results indicated that the average swimming velocity and the strouhal number for these swimmers were similar to those for Olympic swimmers in a previous study. Furthermore, a whiplash-like action was observed in their underwater dolphin kick movement. The EMG results indicated that the active phases of all subjective muscles during one kick cycle were approximately 60%. Co-active phases were observed in all pairs (RA-ES: 24.1±10.1%, RF-BF: 23.2±5.5%, TA-GAS: 45.5±20.2%), and the co-active phase of TA-GAS was significantly larger than for the other pairs (p<0.05). From these results, two main findings emerged with regard to the muscular activity pattern during the underwater dolphin kick in elite female competitive swimmers: (1) the muscular activity patterns in the trunk and thigh muscles were reciprocal; (2) the co-active phase for the lower leg muscles was larger than for the other parts and occurred during the first half of the upward kick phase.

著者

髙木 英樹 下門 洋文 中田 由夫

出版者

筑波大学体育センター

雑誌

大学体育研究 (ISSN:03867129)

巻号頁・発行日

no.35, pp.1-11, 2013-03