Body composition assessed on the basis of arm circumference and triceps skinfold thickness: a new index validated in children by magnetic resonance imaging
Abstract:Fat and muscle areas can be calculated from equations on the basis of upper arm circumference (C) and triceps skinfold thickness (TS). These equations assume a circular limb and muscle compartment and a symmetrically distributed fat rim: total upper arm area (TUA) = C2/(4 pi), upper arm muscle area (UMA) = [C - (TS x pi)2]/(4 pi), and upper arm fat area (UFA) = TUA - UMA. This traditional method underestimates the degree of adiposity. We propose that the unrolled fat rim is a rectangle whose length = C and wid… Show more
“…The use of the upper arm fat estimate, validated by magnetic resonance (Rolland-Cachera et al, 1997), is in agreement with our SUM data, although the reference values obtained in a small sample born during the 1950s were lower than those obtained in the same way in our study.…”
Objective: To observe whether there exists a characteristic body fat mass at pubertal onset. Design: Longitudinal clinical follow-up (between ages of 10 and 15 y) with an annual visit in a sample of 469 children. They were grouped according to age of purbertal onset: boys with pubertal onset at the ages of 11 (n 59), 12 (n 88), 13 n 89) and 14 y (n 46), and girls with pubertal onset at the age of 10 (n 68), 11 (n 66), 12 (n 37) and 13 (n 16). Methods: Height, weight, upper arm circumference and four skinfold thicknesses were recorded annually. In boys testicular volume index was measured, and genital development was assessed on the Tanner scale; in girls mammary development was measured also using the Tanner scale. The sum of four skinfolds, body mass index, upper arm fat estimate and percentage body fat were calculated. Results: Boys presented a positive relation between the age of pubertal onset and body mass index (P`0.001), which was not observed in girls. Body mass index thus varied according to the onset of puberty in boys (P`0.001), but not in girls. The sum of four skinfolds, the upper arm fat estimate index and the percentage of body fat mass did not differ according to age of pubertal onset either in girls (P NS) or in boys (P NS). The characteristic adiposity of the puberty onset is progressively acquired during the previous years in all the groups. Conclusions: Puberty seems to begin with a characteristic subcutaneous body fat mass that is independent of the age of onset. This study supports the hypothesis of a close link between maturation and the development of an energy store in the form of adipose tissue in both sexes. Descriptors: body fat mass; onset of puberty; skinfolds
“…The use of the upper arm fat estimate, validated by magnetic resonance (Rolland-Cachera et al, 1997), is in agreement with our SUM data, although the reference values obtained in a small sample born during the 1950s were lower than those obtained in the same way in our study.…”
Objective: To observe whether there exists a characteristic body fat mass at pubertal onset. Design: Longitudinal clinical follow-up (between ages of 10 and 15 y) with an annual visit in a sample of 469 children. They were grouped according to age of purbertal onset: boys with pubertal onset at the ages of 11 (n 59), 12 (n 88), 13 n 89) and 14 y (n 46), and girls with pubertal onset at the age of 10 (n 68), 11 (n 66), 12 (n 37) and 13 (n 16). Methods: Height, weight, upper arm circumference and four skinfold thicknesses were recorded annually. In boys testicular volume index was measured, and genital development was assessed on the Tanner scale; in girls mammary development was measured also using the Tanner scale. The sum of four skinfolds, body mass index, upper arm fat estimate and percentage body fat were calculated. Results: Boys presented a positive relation between the age of pubertal onset and body mass index (P`0.001), which was not observed in girls. Body mass index thus varied according to the onset of puberty in boys (P`0.001), but not in girls. The sum of four skinfolds, the upper arm fat estimate index and the percentage of body fat mass did not differ according to age of pubertal onset either in girls (P NS) or in boys (P NS). The characteristic adiposity of the puberty onset is progressively acquired during the previous years in all the groups. Conclusions: Puberty seems to begin with a characteristic subcutaneous body fat mass that is independent of the age of onset. This study supports the hypothesis of a close link between maturation and the development of an energy store in the form of adipose tissue in both sexes. Descriptors: body fat mass; onset of puberty; skinfolds
“…3,4 A few years ago we conducted a similar study, comparing anthropometry and magnetic resonance imaging (MRI) in obese and normal weight children. 5 We also found that the Jelliffe formula underestimated fat area in both groups and more markedly in the obese. Moreover, we proposed a simplified formula C Â (T/2) that we named the upper arm fat area estimate (UFE), and found its results very close to MRI data in both studied groups.…”
“…Circumferences measured at midarm, midthigh, waist and hip are used more frequently than others, because they indicate differences among people in major regions of the body. Recently, many studies have used circumferences for estimating skeletal muscle mass and fat distribution (Rolland-Cachera et al, 1997;Moreno et al, 1999).…”
Objective: To analyze the impact of choosing the left or the right side of the body on the anthropometric measurements and derived nutritional indices, in prepubertal children. Design: Cross-sectional pilot nutrition survey. Setting: General prepubertal school-age population. Subjects: One-hundred and sixty-four children (97 boys and 67 girls) aged 7 -9 y. Interventions: None. Results: The agreement between anthropometric measurements in both sides of the body showed that in males and in females, suprailiac skinfold thickness and arm circumference were significantly higher in the left than in the right side of the body. The agreement between body composition assessed by anthropometric measurements in both sides of the body showed that only in males was arm muscle area significantly higher in the left than in the right side, and arm fat percentage was higher in the right than in the left side of the body. Total body fat percentage calculated from skinfold thickness did not show statistically significant differences when skinfolds were obtained in the both sides of the body, either in boys and in girls. Conclusions: Our results show that differences between the sides of the body were lower than the technical error of measurement of the anthropometric measurements obtained and seem not to be biologically significant in this age group. It is necessary to standardize the method of anthropometric assessment of the nutritional status in terms of body side. Sponsorship: Universidad de Zaragoza (216-17).
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