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RISS 인기검색어
- 검색키워드
- 저자 : 糟谷浩輔(Kasuya, Kosuke) (검색결과 4 건)
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最小二乗近似多項式による幼児期男児の体格ㆍ運動能力の時代的変遷に関する検討
糟谷浩輔(Kasuya, Kosuke),藤井勝紀(Fujii, Katsunori),田中望(Tanaka, Nozomi),金俊東(Kim, Jun-dong) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6
This study was to investigate annual trends of physique and physical fitness of 4 and 5 years old boys from 1969 to 2009. Annual trends of physique were considered by height, weight, and BMI. In addition, annual trends of physical fitness were examined by 20m dash, tennis ball throw, standing long jump, one-leg hop and hanging from a horizontal bar. No further shifts toward earlier or larger growth were seen among parameters of physique. Among parameters of motor performance, declining or stagnation trends were seen. Though stagnation trend was seen in height, declining trend was seen in weight. In physical fitness, declining trends were seen especially in tennis ball throw and hanging from a horizontal bar. From these, decreased upper body muscle strength due to decrease in muscle mass was suspected. Also, stagnation or declining trend in other items of physical strength of preschool boys was seen. Considered with the findings in the other reports, the possibility of physical strength is lowered in the coming years was suggested.
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藤井勝紀(Fujii, Katsunori),金俊東(Kim, Jun-Dong),糟谷浩輔(Kasuya, Kosuke) 한국체육과학회 2015 한국체육과학회지 Vol.24 No.6
The physical fitness that is most suited to thriving in modern society may be considered, at minimum, to be that which helps to achieve a good body composition balance for the individual body type. From the relationship between BMI and body composition, we derived the most typical body type, body fat percentage, and muscle percentage, and sought the physical fitness of individuals judged to correspond to that derived body composition balance. Then, by testing that physical fitness, we derived the level of physical fitness that was best suited for the physical development balance of South Korean youth. First, from a polynomial regression analysis of body fat percentage to BMI, we determined that a third order polynomial was appropriate for 13 and 14 year-old boys. Next, in a polynomial regression analysis of muscle percentage to BMI, we again determined that a third order polynomial was appropriate. We then constructed regression polynomial evaluation charts of these appropriate orders, and evaluated the physical fitness level classified in the standard range where the regression polynomial evaluation charts of body fat percentage and muscle percentage to BMI intersect. From evaluation of this physical fitness level, we can suggest the most appropriate level of physical fitness from a perspective different from that which has been used to date for junior high school age children.
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유유아 신체발달의 시대적 변동을 제어하는 고도 경제 성장의 요인 분석
藤井勝紀(Fujii, Katsunori),可兒勇樹(Kani, Yuki),糟谷浩輔(Kasuya, Kosuke),김준동(Kim, Jun-Dong) 한국체육과학회 2017 한국체육과학회지 Vol.26 No.5
The Ministry of Health, Labor and Welfare has published measurement records on height, weight, chest circumference, and head circumference in 0 to 6 year-old children from 1960 to 2010 as indicators of physical development in early childhood in Japan. Physical development evaluation charts have been developed from these records using percentile methods, but reports on the trends in physical development over time are limited. This is because no method has been established to scientifically analyze physical growth. Even more difficult is investigating secular trends in physical growth and linking those trends to economic growth. In this study, we identified the first largest peak velocity (FLPV) during the year after birth in infant physical growth records (height, weight, chest circumference, head circumference), and applied the wavelet interpolation model to the variations over time in the identified FLPV. Next, we applied the wavelet interpolation model to the secular variations in GDP for the same years. We then applied a cross correlation function to the relationship between the curves of FLPV and GDP variations over time, and investigated how high economic growth acts as a controlling factor variations in physical development of young children over time. The speed of variation in the physical development of children over time was the greatest around 1980. By synchronizing GDP to that time, the results suggest that high economic growth is a controlling factor in the physical development of young children.
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藤井勝紀(Fujii, Katsunori),可兒勇樹(Kani, Yuki),糟谷浩輔(Kasuya, Kosuke),김준동(Kim, Jun-Dong) 한국체육과학회 2018 한국체육과학회지 Vol.27 No.2
A clear method for evaluating bone density findings in young children has not been established. One reason behind this is that the changes with age in bone density during early childhood have not been clarified. In this study, a mixed cohort method was adopted and a least squares approximation polynomial was applied to bone density indices (stiffness, BUA, SOS) of children from 3 to 5 years old. We then attempted to construct a bone density evaluation chart for early childhood by clarifying the changes in bone density with age. The method was to measure bone density in 3, 4, and 5 year-old children, and then analyze the age-related changes in the bone density index data obtained in a mixed cohort. The results showed changes with age in the values for stiffness and SOS. The optimal polynomial obtained with least squares approximation was shown to be a third order polynomial for boys and a fourth order polynomial for girls. Therefore, in the standard regression evaluation chart for stiffness values a third order polynomial was applied for boys and a fourth order polynomial was applied for girls. An evaluation chart was constructed from a 5-grade regression evaluation. Normalization was then seen in the frequency distribution, and the bone density evaluation constructed in this study for young children was seen to be effective. The mixed cohort in this study did not provide fundamentally simple cross-sectional data but rather semi-longitudinal data that included almost all tracking data from the same subjects. Therefore, clarification of the trends in changes with age in stiffness has great significance.
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