Reliability and validity of body composition measures in female athletes
| Autor: | Willa C. Fornetti, J. M. Foley, James M. Pivarnik, Justus J. Fiechtner |
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| Rok vydání: | 1999 |
| Předmět: |
Adult
medicine.medical_specialty Measurement method Spectroscopy Near-Infrared Adolescent biology Physiology Athletes business.industry Data Collection Reproducibility of Results biology.organism_classification Surgery Absorptiometry Photon Physiology (medical) Body Composition Electric Impedance Physical therapy medicine Humans Female business Bioelectrical impedance analysis Reliability (statistics) Sports |
| Zdroj: | Journal of Applied Physiology. 87:1114-1122 |
| ISSN: | 1522-1601 8750-7587 |
| DOI: | 10.1152/jappl.1999.87.3.1114 |
| Popis: | The purpose of this investigation was to determine the reliability and validity of bioelectrical impedance (BIA) and near-infrared interactance (NIR) for estimating body composition in female athletes. Dual-energy X-ray absorptiometry was used as the criterion measure for fat-free mass (FFM). Studies were performed in 132 athletes [age = 20.4 +/- 1.5 (SD) yr]. Intraclass reliabilities (repeat and single trial) were 0.987-0.997 for BIA (resistance and reactance) and 0.957-0.980 for NIR (optical densities). Validity of BIA and NIR was assessed by double cross-validation. Because correlations were high (r = 0.969-0.983) and prediction errors low, a single equation was developed by using all 132 subjects for both BIA and NIR. Also, an equation was developed for all subjects by using height and weight only. Results from dual-energy X-ray absorptiometry analysis showed FFM = 49.5 +/- 6.0 kg, which corresponded to %body fat (%BF) of 20.4 +/- 3.1%. BIA predicted FFM at 49.4 +/- 5.9 kg (r = 0.981, SEE = 1.1), and NIR prediction was 49. 5 +/- 5.8 kg (r = 0.975, SEE = 1.2). Height and weight alone predicted FFM at 49.4 +/- 5.7 kg (r = 0.961, SEE = 1.6). When converted to %BF, prediction errors were approximately 1.8% for BIA and NIR and 2.9% for height and weight. Results showed BIA and NIR to be extremely reliable and valid techniques for estimating body composition in college-age female athletes. |
| Databáze: | OpenAIRE |
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