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Related Experiment Videos

Validity of Futrex-5000 for body composition determination.

K P McLean1, J S Skinner

  • 1Exercise and Sport Research Institute, Arizona State University, Tempe 85287-0404.

Medicine and Science in Sports and Exercise
|February 1, 1992
PubMed
Summary

Skinfolds (SKF) provide a more accurate body fat estimation than the Futrex-5000 (FTX) near-infrared method, especially for lean or obese individuals. SKF measurements closely align with underwater weighing (UWW) criterion.

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Area of Science:

  • Human physiology
  • Body composition analysis
  • Sports science

Background:

  • Accurate body fat assessment is crucial for health and performance monitoring.
  • Traditional methods like underwater weighing (UWW) are accurate but impractical.
  • Near-infrared interactance (NIR) devices like the Futrex-5000 (FTX) offer convenience but require validation.

Purpose of the Study:

  • To compare the accuracy of skinfolds (SKF) and Futrex-5000 (FTX) for estimating body fat percentage.
  • To validate these methods against the criterion standard of underwater weighing (UWW).
  • To assess the influence of measurement sites and body mass index (BMI) on FTX accuracy.

Main Methods:

  • 30 males and 31 females underwent body fat estimation using UWW, SKF (Y's Way to Fitness equations), and FTX (NIR at biceps plus additional sites).

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  • Correlation coefficients and percentage of subjects within +/- 4% of UWW values were calculated.
  • Partial F-tests evaluated the predictive contribution of BMI and NIR measurements.

    • Main Results:

    • SKF showed significantly higher correlations with UWW than FTX for males (0.95 vs 0.80), females (0.88 vs 0.63), and the total group (0.94 vs 0.81).
    • 87% of subjects were within +/- 4% of UWW using SKF, compared to only 52% with FTX.
    • FTX inaccurately estimated body fat at extremes (overestimating in lean, underestimating in obese); additional NIR sites did not improve accuracy. Using BMI improved FTX prediction in females.

    Conclusions:

    • Skinfolds (SKF) are a more accurate and reliable method for estimating body fat percentage compared to the Futrex-5000 (FTX).
    • SKF provides better accuracy across the entire body fat continuum, particularly at the extremes.
    • While NIR offers some predictive value, SKF remains superior for precise body composition assessment.