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Body composition estimates from NHANES III bioelectrical impedance data.

W C Chumlea1, S S Guo, R J Kuczmarski

  • 1Department of Community Health, Wright State University School of Medicine, Dayton, Ohio, USA.

International Journal of Obesity and Related Metabolic Disorders : Journal of the International Association for the Study of Obesity
|December 4, 2002
PubMed
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National body composition data is now available for US adults. This study provides key reference values for total body water, fat-free mass, and fat mass, crucial for understanding obesity and sarcopenia trends.

Area of Science:

  • Human physiology
  • Population health
  • Biostatistics

Background:

  • Body composition estimates are vital for tracking obesity and sarcopenia in the US population.
  • Previous national body composition data was unavailable.
  • This study addresses the need for national body composition estimates.

Purpose of the Study:

  • To estimate total body water (TBW), fat-free mass (FFM), total body fat (TBF), and percentage body fat (%BF) for the US population.
  • Utilize transformed bioelectrical impedance analysis (BIA) data within sex-specific, multicomponent models.
  • Establish national body composition benchmarks.

Main Methods:

  • Employed data from the third National Health and Nutrition Examination Survey (NHANES III; 1988-1994).
  • Developed and applied sex-specific BIA prediction equations.

Related Experiment Videos

  • Estimated mean TBW, FFM, TBF, and %BF for diverse demographic groups.

    • Main Results:

    • Males exhibited higher mean TBW and FFM than females across all age and racial-ethnic groups.
    • TBW and FFM increased from adolescence to mid-adulthood, then declined in older adults.
    • Females consistently showed higher mean TBF and %BF than males; TBF increased with age until approximately 60 years.

    Conclusions:

    • The study provides the first national body composition estimates for the US population using NHANES III BIA data.
    • These estimates serve as a descriptive reference for non-Hispanic whites, non-Hispanic blacks, and Mexican Americans.
    • The findings are essential for monitoring weight-related health conditions and informing public health strategies.