Research Article
Examination of Physical Fitness and Bone Mineral Density Based on Differences in Morphological Quality in Adolescent Girls
Yuki Takeyama*
,
Katsunori Fujii
Issue:
Volume 13, Issue 1, March 2025
Pages:
1-9
Received:
20 December 2024
Accepted:
8 January 2025
Published:
23 January 2025
DOI:
10.11648/j.ajss.20251301.11
Downloads:
Views:
Abstract: BMI is convenient because it is easily used to determine the level of obesity and slimness, but because the degree of fat mass accumulation differs in relation to body type, the physical strength and athletic ability of obese and slim individuals may be misjudged. Therefore, in this study, in order to establish a method to objectively judge the degree of accumulation of fat mass relative to the body type of junior high school girls, we construct a standardized evaluation chart from a polynomial regression analysis of body fat percentage relative to BMI. Based on the constructed evaluation chart, the degree of fat accumulation is determined in the obese, normal, and slim body types judged by BMI, and classified into categories of more fat, normal and less fat. The aim was to examine physical fitness, athletic performance, and bone density in the classified categories. The subjects were 341 Japan female junior high school students, and physique, body composition, physical fitness tests and bone density were measured. First, among the groups classified into the obese, standard, and slim types based on fatness judged by BMI, physical strength, athletic ability, and bone density were particularly high in the order of obese, standard, and slim. However, in other physical fitness and athletic ability categories, it was shown that sit-ups, long-seated forward bends, side steps, 20-meter shuttle run, 50-meter run, and standing long jump were high in the order of standard, slim, and obese. Next, in order to verify physical strength, athletic ability, and bone density due to differences in morphological quality, we compared nine categories based on a polynomial regression evaluation chart of body fat percentage to BMI based on differences in the degree of fat accumulation (more fat, normal, and less fat). As a result, it was clarified that individuals of the obese type with less fat were superior in terms of grip strength and bone density. In other physical strength and athletic ability measures (sit-ups, long-seated forward bend, side steps, 20 m shuttle run, 50 m run, standing long jump, handball throw), the standard type was superior, and among them those with less fat did the best. For the first time, the relationship between physical strength, athletic ability, and bone density in the morphological qualities of Japan female junior high school students was derived, and it may become useful knowledge for future health education guidance.
Abstract: BMI is convenient because it is easily used to determine the level of obesity and slimness, but because the degree of fat mass accumulation differs in relation to body type, the physical strength and athletic ability of obese and slim individuals may be misjudged. Therefore, in this study, in order to establish a method to objectively judge the deg...
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