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<p>Cardiorespiratory fitness (CRF) is closely associated with multiple health indicators. The Body Round Index (BRI) is a new indicator of obesity, yet few studies have examined its association with CRF. The purpose of this study is to investigate whether CRF in adolescents is associated with BRI. From September to December 2023, a cross-sectional assessment of height, weight, waist circumference, and 20&#xa0;m shuttle run test(20-m SRT) performance was conducted among 42,341 [boys, 21849 (51.6%)] children and adolescents aged 7–18&#xa0;years across five regions in mainland China using stratified cluster sampling. The association between BRI and cardiorespiratory fitness was analyzed using one-way analysis of variance (ANOVA), LSD comparisons, and curve regression analysis. 20-m SRT among children and adolescents aged 7–18&#xa0;years in mainland China was (39.84 ± 18.29) laps, with a BRI of (2.11 ± 0.98). As BRI progressively increased, 20-m SRT exhibited a trend of initial increase followed by a decline. The effect of BRI on 20-m SRT was more pronounced in boys than in girls. Overall, 20-m SRT peaked at BRI values of 0.635, 1.435, 2.315, and 2.155 for children and adolescents aged 7–9&#xa0;years, 10–12&#xa0;years, 13–15&#xa0;years, and 16–18&#xa0;years, respectively, reaching values of 18.747 laps, 26.899 laps, 37.343 laps, and 40.565 laps, respectively.</p><p><i>Conclusions</i>: Children and adolescents aged 7–18 in mainland China exhibit an inverted U-shaped relationship between BRI and 20-m SRT, with both boys and girls showing the same trend.</p> Graphical Abstract <p></p>

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Association between body roundness index and cardiopulmonary fitness: a cross-sectional study of children and adolescents aged 7–18 years in Mainland China

  • 期刊论文

  • 发表日期：

    2026年5月12日

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  • Cunjian Bi,
  • Xiaokang Ran,
  • Feng Zhang,
  • Hui Wang,
  • Mengmeng Zhang,
  • Pengwei Sun,
  • Mingrui Wang

摘要

Cardiorespiratory fitness (CRF) is closely associated with multiple health indicators. The Body Round Index (BRI) is a new indicator of obesity, yet few studies have examined its association with CRF. The purpose of this study is to investigate whether CRF in adolescents is associated with BRI. From September to December 2023, a cross-sectional assessment of height, weight, waist circumference, and 20 m shuttle run test(20-m SRT) performance was conducted among 42,341 [boys, 21849 (51.6%)] children and adolescents aged 7–18 years across five regions in mainland China using stratified cluster sampling. The association between BRI and cardiorespiratory fitness was analyzed using one-way analysis of variance (ANOVA), LSD comparisons, and curve regression analysis. 20-m SRT among children and adolescents aged 7–18 years in mainland China was (39.84 ± 18.29) laps, with a BRI of (2.11 ± 0.98). As BRI progressively increased, 20-m SRT exhibited a trend of initial increase followed by a decline. The effect of BRI on 20-m SRT was more pronounced in boys than in girls. Overall, 20-m SRT peaked at BRI values of 0.635, 1.435, 2.315, and 2.155 for children and adolescents aged 7–9 years, 10–12 years, 13–15 years, and 16–18 years, respectively, reaching values of 18.747 laps, 26.899 laps, 37.343 laps, and 40.565 laps, respectively.

Conclusions: Children and adolescents aged 7–18 in mainland China exhibit an inverted U-shaped relationship between BRI and 20-m SRT, with both boys and girls showing the same trend.

Graphical Abstract