Examination of a Sigmoid Shape Composition for BMI Fluctuation and Fat Percentage
Katsunori Fujii,
Nozomi Tanaka,
Yuki Takeyama,
Tohru Ishigaki
Issue:
Volume 9, Issue 3, September 2021
Pages:
60-65
Received:
25 June 2021
Accepted:
12 July 2021
Published:
16 July 2021
Abstract: Body mass index (BMI) is an index of physique proposed by Quetelet, and has been given meaning as the Quetelet function, which is the ratio of body weight to the square of height. In recent years, BMI has been considered an indicator of obesity due to its high correlation with body fat percentage. However, while the relationship between BMI and body fat percentage shows a high correlation, the composition of that relationship is not well understood. Moreover, there is almost no information on the relational composition in males and females. In this study, we investigated that relational composition to determine whether the relationship between BMI and body fat percentage follows a linear trend or a curvilinear trend. For that purpose, we analyzed the changes in body fat percentage associated with fluctuations in BMI. For BMI fluctuations, the body fat percentage of the scale width of one BMI unit was calculated when BMI was increased one unit at a time, and the changes in the calculated statistics were analyzed. The type of function series to which the relationship between BMI and body fat percentage fits was then verified. The results demonstrated that in males the fluctuations in body fat percentage with respect to BMI show a sigmoid shape. In males, when BMI exceeds 25, the velocity of body fat percentage decreases and soon reaches a constant level. A sigmoid curve is thought to be a finding that means a critical point in the inflection point phenomenon. Therefore, the fact that the change in body fat percentage with respect to BMI shows a sigmoid shape means that, in males, body fat percentage shows a critical point at a BMI of 25. In females, however, the critical point is a BMI of 28.6 and body fat percentage reaches a constant level when a point higher than that in males is exceeded, but the shape could not be judged to be sigmoid. There are limits to BMI for humans, we propose a limiting body fat percentage hypothesis in which body fat percentage becomes constant from a BMI of around 32.
Abstract: Body mass index (BMI) is an index of physique proposed by Quetelet, and has been given meaning as the Quetelet function, which is the ratio of body weight to the square of height. In recent years, BMI has been considered an indicator of obesity due to its high correlation with body fat percentage. However, while the relationship between BMI and bod...
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Analysis of the Effect of Progressive Speed Training on Tribal and Non-tribal School Boys
Shaybal Chanda,
Chandra Sankar Hazari,
Sumanta Kumar Mondal
Issue:
Volume 9, Issue 3, September 2021
Pages:
66-72
Received:
8 August 2021
Accepted:
20 August 2021
Published:
13 September 2021
Abstract: Sprint training should start at the early stages of the athletes considering the importance of it as one of the most important motor abilities to achieve the best performance of the athlete at the desired age. The study aims to identify the progression of progressive speed training basis on the duration of training of the Santali tribe and Bengali high school boys. Subjects were Santali tribe and Bengali adolescent schoolboys and their ages ranged between 13 to 15 years selected from Bankura District of West Bengal, India. These two groups were further divided into control and experimental groups and in each of the groups, there were 20 students. Initially, 4 weeks of uniform conditioning training was given to all groups before the pretest T1 was conducted. Further, consecutively 3 more post-tests (T2, T3, & T4) were conducted after every 4 weeks providing progressive speed training. In the descriptive part Mean trimming was revealed. For the comparison of performed Tests timing, MANOVA, ANOVA, and LSD post hock test were employed. The result of the study reveals that Non-tribal (Bengali) and Tribal (Santali) adolescent schoolboys responded positively with the designed progressive speed training. This progression of sprint test timing took place progressively over time on the Bengali and Santali boys distinctly within the groups. Progression of Bengali boys took place from Test 1 to Test 2 numerically but not statistically, which is the dissimilarity in the process of progression of speed ability with the Santali boys. It is concluded that alike progressive speed training is equally effective for the Santali tribe and Bengali schoolboys but the progression of Bengali Boys begins a bit slower in the early stages than the Santali tribe in the sprint ability.
Abstract: Sprint training should start at the early stages of the athletes considering the importance of it as one of the most important motor abilities to achieve the best performance of the athlete at the desired age. The study aims to identify the progression of progressive speed training basis on the duration of training of the Santali tribe and Bengali ...
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