Benefits of normal body mass index on physical fitness: A cross-sectional study among children and adolescents in Xinjiang Uyghur Autonomous Region, China

• DOI: 10.1371/journal.pone.0220863
• Publication Date: 2019-08-15T13:38:50Z
• Authors: Cunjian Bi; Junmin Yang; Jian Sun; Yi Song; Xiaoyan Wu; Feng Zhang
• Keywords: Cross-sectional study

Objective To assess the association between body mass index (BMI) and physical fitness (PFI) among children adolescents in Xinjiang Uyghur Autonomous Region, China. Methods In total, 17,618 aged 7–18 years from selected region were enrolled this cross-sectional study (8,800 boys 8,818 girls). Participants stratified by age sex divided into five groups BMI percentiles: very low (BMI <5th percentile); low, (5th ≤ < 15th normal (15th 85th high (85th 95th ≥95th percentile). PFI was assessed height, weight, health-related indicators (grip strength, standing long jump, sit reach, 50 m dash, endurance run). Results significantly associated with during adolescence (13–18 years) pre-adolescence (7–12 girls. Between ages of 13 18 years, an increase had a greater impact on than showed parabolic curvilinear relationship BMI. Conclusion Children China's Region demonstrated good fitness. A below or above range may contribute to poor The shows inverted U-shaped curve.