中国汉族青年两性皮褶厚度差异的分布OA

Objective:To investigate the distribution of sexual dimorphism of skinfold thickness in the youth of Han nationality and its association with environmental factors.Methods:Data were obtained from the 2010 and 2014 Chinese School Student Physical Fitness and Health Surveillance surveys,which included 47 466 males and 47 611 females.Sexual dimorphism indices(SDI)were calculated for triceps,subscapular,and abdominal skinfold thickness.We also analyzed the correlation between SDI and sexual dimorphism in body size and body composition,alongside environmental factors.Results:The SDI of upper limbs skinfold thickness was higher than that of trunk skinfold thickness.The SDI of skinfold thickness was lower in 2014 compared with 2010 among the youth.The SDI of trunk skinfold thickness showed low to moderate positive correlations with the SDI of body mass and body composition.No significant differences were found between southern and northern populations,which is consistent with weak correlations with natural environmental factors.The SDI of skinfold thickness exhibited low to moderate positive linear correlations with social environmental factors.Conclusion:Sexual dimorphism in skinfold thickness varies between the upper limbs and the trunk,which is related to sex-hormonal regulation of subcutaneous fat distribution.The close association between sexual dimorphism in skinfold thickness and social environmental factors suggests divergent adaptive responses between males and females to societal changes.