Abstract

Objective: The relationship between muscle mass and the aggregation of cardiovascular risk factors in adolescents is still controversial, therefore this study aimed to explore the relationship between muscle mass index (MMI) and the aggregation of cardiovascular risk factors (CVRFs) in adolescents. Design and method: A total of 1622 adolescents(1000 boys, 61.6%) aged 12–17 years from Ningxia were randomly selected through a stratified cluster sampling. we measured body composition by bioelectric impedance analysis (BIA), and calculated muscle mass index (MMI). The aggregation of cardiovascular risk factors is defined as the number of hypertension, abnormal fasting blood glucose, High total cholesterol (TC), High low-density lipoprotein cholesterol (LDL-C), Low high-density lipoprotein cholesterol (HDL-C), High triglyceride (TG). Results: MMI was a risk factor for the aggregation of cardiovascular risk factors (all P values < 0.001). After adjusting for age, gender and BMI, MMI became a protective factor for CVRFs>=1 (OR= 0.74, 95%CI: 0.62–0.89). In total population, the ORs for CVRFs> = 1 were 0.60 (95%CI: 0.46–0.79) in good MMI, 0.56 (95%CI:0.37–0.85) in sufficient MMI compared with insufficient MMI; The ORs for CVRFs> = 2 were 0.54 (95%CI: 0.37–0.79), 0.51 (95%CI: 0.30–0.87) respectively. Similar results were found in boys (all P values < 0.05). Conclusions: Muscle mass index as a protective factor for cardiovascular risk factor aggregation in adolescents with the same BMI level. Physical exercise of children and adolescents should be emphasized to maintain the best muscle mass and weight.

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