Validity of near-infrared interactance for estimating relative body fat in female high school gymnasts

D. B. Smith, G. O. Johnson, J. R. Stout, T. J. Housh, Dona J Housh, T. K. Evetovich

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The present investigation examined the validity of near-infrared interactance (NIR) estimates of relative body fat (% fat) from the Futrex-5000 (F5000), Futrex-5000 A (F5000 A), and Futrex-1000 (Fl000) instruments. Ninety-eight female high school gymnasts (X̄ age ± SD = 15.7 ± 1.2 yr) participated in this investigation. Subsamples were used to cross-validate the F5000 (n = 52), F5000 A (n = 46), and F1000 (n = 89) instruments. The NIR % fat estimates were validated against criterion % fat from underwater weighing (UWW) using the adult conversion constants of Brozek et al. (6) (UWWB) and the female age-specific constants of Lohman (23) (UWWL). The cross-validation statistical analysis included examination of the constant error (CE), standard error of estimate (SEE), r, and total error (TE). In addition, full-model multiple regression analyses were used to predict UWWB or UWWL from body weight (BW) and height (HT). BW and HT were correlated with % fat at R = 0.65-0.70, while the validity coefficients for the NIR instruments ranged from r=0.40-0.78. The F5000 resulted in nonsignificant CE values (- 0.3% fat vs UWWB and 1.5 % fat vs UWWL; p > 0.008) as well as the lowest TE values (TE = 3.1% fat vs UWWB and 4.0% fat vs UWWL). All other NIR estimates of % fat resulted in TE values ≤ 6.3% fat. In addition, for all NIR instruments there were negative correlations for the plots of the CE versus the mean of predicted and criterion (UWWB and UWWL)% fat. Therefore, the present findings indicated that the F5000 provided more accurate estimates of % fat than the F5000 A or F1000 instruments, but may underestimate the desired minimal body weight for female gymnasts at the low end of the % fat distribution.

Original languageEnglish (US)
Pages (from-to)531-537
Number of pages7
JournalInternational Journal of Sports Medicine
Volume18
Issue number7
DOIs
StatePublished - Dec 2 1997

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Adipose Tissue
Fats
Body Height
Body Weight
Regression Analysis

Keywords

  • Body composition
  • Gymnasts
  • Near-infrared interactance

ASJC Scopus subject areas

  • Orthopedics and Sports Medicine
  • Physical Therapy, Sports Therapy and Rehabilitation

Cite this

Validity of near-infrared interactance for estimating relative body fat in female high school gymnasts. / Smith, D. B.; Johnson, G. O.; Stout, J. R.; Housh, T. J.; Housh, Dona J; Evetovich, T. K.

In: International Journal of Sports Medicine, Vol. 18, No. 7, 02.12.1997, p. 531-537.

Research output: Contribution to journalArticle

Smith, D. B. ; Johnson, G. O. ; Stout, J. R. ; Housh, T. J. ; Housh, Dona J ; Evetovich, T. K. / Validity of near-infrared interactance for estimating relative body fat in female high school gymnasts. In: International Journal of Sports Medicine. 1997 ; Vol. 18, No. 7. pp. 531-537.
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