### Abstract

The purposes of this investigation were to (a) modify the y-intercepts of previously published skinfold (SF) equations using the constant error (CE) values from Stout et al. (24); (b) cross-validate the modified equations to determine their accuracy for estimating body density (BD) in young wrestlers; (c) derive a new SF equation for estimating BD in young wrestlers, if the modified equations are not found to be accurate; and (d) cross-validate the new SF equation on an independent sample of young wrestlers. One hundred thirty-seven age-group wrestlers (mean ± SD age = 11.3 ± 1.6 year) volunteered to perform underwater weighing for the determination of BD and to have SF measured at 8 sites. Cross-validation of the 16 modified SF equations on a random sample of 50 subjects resulted in total error (TE) values that were ≥ 0.0110 g·cm^{-3} (approximately 5.1% fat). Therefore, the following SF equation was derived on a random sample of 100 of the subjects: BD = 1.056-0.00098 (triceps SF) + 0.00132 (age in years)- 0.0017 (anterior suprailiac SF) + 0.00031 (body weight in kg). R = 0.78, SEE = 0.0064 g·cm^{-3}. Cross-validation of this equation on an independent sample of 37 subjects resulted in a nonsignificant (p > 0.05) CE of -0.0009 g·cm^{-3}, a validity coefficient (r) of 0.70, SEE of 0.0076 g·cm^{-3}, and TE of 0.0076 g·cm^{-3}. Therefore, this SF equation is recommended for estimating body composition characteristics in young wrestlers. Future studies should cross-validate this equation on young athletes in various sports.

Original language | English |
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Pages (from-to) | 477-482 |

Number of pages | 6 |

Journal | Journal of Strength and Conditioning Research |

Volume | 14 |

Issue number | 4 |

Publication status | Published - Nov 2000 |

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### All Science Journal Classification (ASJC) codes

- Orthopedics and Sports Medicine
- Public Health, Environmental and Occupational Health
- Physical Therapy, Sports Therapy and Rehabilitation

### Cite this

*Journal of Strength and Conditioning Research*,

*14*(4), 477-482.