body composition and basal metabolic rate in pre-school children: no sex difference
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abstract
b a ckground: previous studies have suggested that sex may be a factor influencing basal metabolic rate (bmr) in adults and school age children. however, few data are available about the effects of sex on bmr in pre-school children. in the present study, we investigated whether sex differences contribute to variations in bmr in pre-school age children. m et h o ds : measurements were made on thirty children aged 2-6 years (14 male and 16 female). measurements were taken of height, age, weight, and total body composition, which was determined using both dual-energy x-ray absorptiometry (dxa) and deuterium dilution. the dxa was also used to determine body composition in different regions of the body. bmr was measured by indirect calorimetry. re sul t s : we found no significant sex differences with respect to age (f = 0, p = 0.998), weight (f = 0.02, p = 0.884), height (f = 0.33, p = 0.570), and body mass index standard deviation score (f = 0.51, p = 0.480). in addition, no significant difference was found between boys and girls for total fat free mass (ffm) (f = 1.30, p = 0.265) and fat mass (fm) (f = 3.16, p = 0.090) measured by dxa, and total ffm (f = 0.79, p = 0.380) and fm (f = 3.38, p = 0.080) obtained by deuterium dilution. there was no significant difference between pre-school boys and girls for bmr (f = 0.16, p = 0.690). in a multiple regression analysis, only log weight was significantly associated to bmr. the explain variation was 75.3%. c o n c lusi o n : in conclusions we found no significant differences in body composition between pre-school boys and girls and no sex effect on bmr in this age group.
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Journal title:
journal of nutritional sciences and dieteticsجلد ۱، شماره ۲، صفحات ۸۶-۹۲
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