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Objective To explore the relationship between body muscle mass and body mass index of school-age children and their growth differences in different seasons. Methods A total of 526 cases of preschool children who came to Hengshui People's Hospital for examination from June 2018 to June 2020 were selected as observation objects, including 300 males and 226 females, aged 6-11 years old, with an average age of (8.2 years ±0.2 years). According to the body mass index (BMI), children are divided into normal body weight, overweight weight and obese groups. According to the season, preschool children were divided into four groups, spring group, summer group, autumn group, and winter group, with 131 cases in each group. The physique of preschool children was tested, and the serum 25(OH)D was detected at the same time, the body muscle mass was measured by the bioelectrical impedance method, and the whole body muscle mass index was calculated. Multi-factor linear regression was used to analyze the relationship between vitamin D nutritional status and muscle mass index ; To study the average vitamin D content of children and the differences in different seasons. Results There were 396 children with normal BMI, 90 were overweight, and 40 were obese. The children's normal weight, overweight, and obesity were divided into groups. According to the increase in BMI, the normal vitamin level group, overweight group, and obesity group also decreased, and the difference was statistically significant (P0.05). Compared with the vitamin D deficiency and deficiency groups, the number of children with sufficient vitamin D is also increasing, and the children with sufficient vitamin D have a fixed-point visit to the MMI. According to the analysis results, it is observed that there is a statistically significant difference in vitamin D nutrition and body muscle mass levels (P<0.05). The serum 25(OH)D levels of children in summer and autumn were significantly higher than those in spring and winter, and the difference was statistically significant (P<0.05). Conclusion The body muscle mass and body mass index of preschool children have a significant relationship with 25(OH)D. When 25(OH)D is sufficient, higher body muscle mass can be obtained and the body mass index can be decreased. The growth difference in different seasons is manifested in the higher 25(OH)D in summer, which is more conducive to the growth and development of preschool children.
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Objective To explore the body composition characteristics of four ethnic groups in Western Mongolia. Methods Bioelectrical impedance analysis was used on the Western Mongolia four ethnic groups 18 indices of body composition. which include Qinghai Khoshut tribe(166 males, 195 females), Xinjiang Chahar tribe (217 males, 226 females), Xinjiang Torgouts tribe(112 males, 127 females), Alxa Khoshut tribe (89 males, 144 females).Using principal component analysis method to explore the characteristics of the Mongolian body composition in the west of China. Results The body composition data of four ethnic groups were obtained. The gender difference of most indicators was statistically significant. The fat rate of female trunk and limbs was higher, while the muscle mass of male was larger. Principal component analysis showed that compared with the southern ethnic group, the northern ethnic group had larger bone mass, more developed muscles and higher level of fat development. On the principal component scatter plot, the distance between the mongols in Western China and other ethnic groups was relatively far, indicating that the body composition of the mongols in Western China had unique characteristics. Conclusion Among the Chinese ethnic groups, the Western Mongolians have large bone mass, well developed muscles and high body fat.
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Objective@#To investigate consistency of whole-body muscle mass (WBMM) assessed using multi-frequency bioelectrical impedance analysis (MF-BIA) and dual energy X-ray Absorptiometry (DXA) measurement, and to delvelop the correction regression formulas for the method of MF-BIA.@*Methods@#1 488 participants who resided in Beijing longer than one year, under 22 to 55 years of age, with self-report BMI ≥24 kg/m2 were voluntarily recruited based on convenience sampling in Beijing, from April 1st 2014 to May 2nd 2014. After excluded 171 participants who BMI ≤24 kg/m2 or with organic diseases when physical examination, Finally 1 317 overweight/obese participants were enrolled into the current study. All the subjects received the measurement of WBMM using both MF-BIA and DXA methods. The paired-samples T test was used to compare the difference of measurement values between MF-BIA and DXA methods. We evaluated the agreement of WBMM measured by MF-BIA and DXA using the interclass correlation coefficients (ICC) and the Bland-Altman plots, and using linear regression method established correction regression formulas.@*Results@#The differences of overweight male, obese male, overweight female, and obese female were (3.29 ± 1.94), (2.05 ± 2.65), (0.17 ± 1.85), and (-2.22 ± 2.89) kg between methods of MF-BIA and DXA, respectively; Except the overweight female, the others groups had the statistically significant difference (P<0.05). The ICC for overweight male, obese male, overweight female, and obese female were 0.958, 0.956, 0.911, and 0.851, respectively (P<0.001). Bland-Altman plots showed that the limit of agreement for four groups were -0.51-7.09, -3.14-7.24, -3.46-3.80, and -7.88-3.44 kg, respectively. Correction regression formulas: overweight male population: yDXA=-0.648+ 0.952 xMF-BIA; obese male population: yDXA=-3.646 + 1.026xMF-BIA; overweight female groups: yDXA=-4.800 + 1.117 xMF-BIA; obese female group: yDXA=-9.884+ 1.287xMF-BIA.@*Conclusion@#The correlation and agreement of WBMM measured by the methods of BIA and DXA were relative weak in Chinese excess weight male and obese female adults. Therefore, measuring WBMM by MF-BIA method in these adults should be corrected to reduce bias compared with the DXA method.