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Related Experiment Videos

Hydrostatic weighing without head submersion: description of a method.

J E Donnelly1, T E Brown, R G Israel

  • 1Human Performance Laboratory, Kearney State College, NE 68849.

Medicine and Science in Sports and Exercise
|February 1, 1988
PubMed
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Hydrostatic weighing at residual volume (RV) provides accurate body density measurements comparable to total lung capacity without head submersion (TLCNS). This method is reliable for assessing body composition in males and females.

Area of Science:

  • Exercise Physiology
  • Body Composition Analysis
  • Anthropometry

Background:

  • Accurate body composition assessment is crucial in exercise physiology.
  • Hydrostatic weighing (HW) is a gold standard method, but variations exist.
  • Measuring at residual volume (RV) or total lung capacity without head submersion (TLCNS) are common approaches.

Purpose of the Study:

  • To develop and validate predictive equations for body density using hydrostatic weighing at residual volume (RV) based on measurements at total lung capacity without head submersion (TLCNS).
  • To assess the reliability and accuracy of the TLCNS method for body density determination.
  • To compare body composition results obtained from RV and TLCNS methods.

Main Methods:

  • Hydrostatic weighing (HW) was conducted at both residual volume (RV) and total lung capacity without head submersion (TLCNS) in 182 adults (95 males, 87 females).

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  • Residual volumes were determined using the oxygen dilution method.
  • Regression analysis was used to derive equations predicting body density at RV from body density at TLCNS, followed by cross-validation.

    • Main Results:

    • Predictive equations were established for males (pDb = 0.5829 * Db + 0.4059) and females (pDb = 0.4745 * Db + 0.5173).
    • Cross-validation demonstrated no significant differences in body density between the RV and TLCNS methods for either sex.
    • Test-re-test reliability for the TLCNS procedure was high (r = 0.98), and mean percent fat differences between methods were minimal.

    Conclusions:

    • Hydrostatic weighing at residual volume (RV), when predicted from TLCNS measurements, provides a valid and reliable method for determining body density.
    • The developed regression equations allow for accurate body composition assessment using the less demanding TLCNS procedure.
    • This research offers a practical alternative for body density measurement in diverse populations.