Glycated hemoglobin (HbA1c) is independently associated with the bioelectrical impedance phase angle in junior sumo wrestlers: A pilot study

Physiol Rep. 2024 May;12(9):e16045. doi: 10.14814/phy2.16045.


The study explores the relationship between phase angle (PhA), an indicator of cellular health, and metabolic health parameters among junior sumo wrestlers in Japan. Given the demanding lifestyle and high-energy diets of sumo wrestlers that predispose them to metabolic syndrome post-retirement, this study focuses on a younger cohort. The primary aim is to evaluate if PhA could serve as an early indicator of metabolic health issues within this unique demographic. A total of 14 sumo wrestlers aged 9-17 years were assessed to determine the relationship between PhA and various metabolic markers, including glycated hemoglobin (HbA1c), using a TANITA MC-780A-N body composition analyzer and standard blood tests. Bivariate regression analysis and Pearson's correlation revealed a negative relationship between PhA and HbA1c even after adjusting for age and weight (ß = -0.496, r2 = 0.776, r = -0.756, p = 0.004). The results indicate a significant negative relationship between PhA and HbA1c levels, suggesting that lower PhA values, which indicate poorer cellular integrity, are associated with higher HbA1c levels, signifying impaired glycemic control. These findings underscore the potential of PhA as a valuable biomarker for monitoring metabolic health in young sumo wrestlers, with implications for early intervention and management strategies.

Keywords: bioelectrical impedance analysis; glycated hemoglobin; metabolic parameters; phase angle.

MeSH terms

  • Adolescent
  • Biomarkers / blood
  • Body Composition / physiology
  • Child
  • Electric Impedance*
  • Glycated Hemoglobin* / metabolism
  • Humans
  • Male
  • Pilot Projects
  • Wrestling* / physiology


  • Glycated Hemoglobin
  • hemoglobin A1c protein, human
  • Biomarkers