AUTHOR=Wu Dingting , Shi Liuhong , Xu Qiongying , Zeng Yuanyuan , Lin Xihua , Li Xiaolin , Zhao Hanxin , Zhu Zhihong , Fu Yeliu , Li Hong , Dong Xuehong 

TITLE=The Different Effects of Skeletal Muscle and Fat Mass on Height Increment in Children and Adolescents Aged 6–11 Years: A Cohort Study From China

JOURNAL=Frontiers in Endocrinology

VOLUME=Volume 13 - 2022

YEAR=2022

URL=https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2022.915490

DOI=10.3389/fendo.2022.915490

ISSN=1664-2392

ABSTRACT=Objective: This study aimed to investigate the contribution of body composition including skeletal muscle mass (SMM) and body fat mass (BFM) to longitudinal growth among children and adolescents aged 6-11 years old. 

Methods: This cohort study were conducted from the annual health examination between 2019 and 2020. Annual height gain and weight gain, changes of SMM and BFM were calculated and compared between sexes, different nutritional status and growth curve shifting mode. Spearman analyses and Multiple linear regression analysis were performed to identify the impact of SMM, BFM or body mass index (BMI) on height gain. 

Results: Of the 584 subjects, the annual height gains of boys (4.76cm in 6-9 years group and 4.63cm in 10-11 years group) were significantly lower than those of girls (5.48cm and 5.74cm, respectively). Spearman analysis showed that SMM gain and height gain were positively and significantly correlated in each examination of all children (r =0.535 for boys and 0.734 for girls, P<0.001). Conversely, BFM and height gains were negatively (r =-0.5240 for boys and -0.232 for girls, P<0.001) correlated. Multiple linear regression analysis identified SMM gain as independent predictor (95%CI: 1.20,1.44) of height gain after adjusting for age, gender, BMI, BFM gain and percentage of body fat (PBF). 

Conclusion: SMM gains, rather than BFM gains, were associated with height gains in children and adolescents aged 6-11 years old. Monitoring SMM changes in routine health care might motivate children and adolescents to achieve dietary and exercise recommendations, thereby growing taller without gaining excessive weight.