Errors in dual energy x-ray absorptiometry estimation of body composition induced by hypohydration
Rodriguez-Sanchez N, Galloway SD
International journal of sport nutrition and exercise metabolism · 31 citas
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- Ensayo clínico controlado (clasificado por nuestro filtro de IA)
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Publicación
- Publicado
- 2014-07-14 · Int J Sport Nutr Exerc Metab · vol. 25 · número 1 · págs. 60–68
- Editorial
- Human Kinetics
- Citado
- 44 citas · más que el 78% de estudios similares · 1.2× el promedio de su campo
- Referencias
- 375 trabajos
- Acceso
- De pago
- Áreas de investigación
- Body Composition Measurement Techniques · Thermoregulation and physiological responses · Sports Performance and Training
- Palabras clave
- Dual-energy X-ray absorptiometry, Composition (language), Dual energy, Medicine, Mathematics, Internal medicine, Bone mineral, Osteoporosis
- MeSH
- humans, dehydration, electrolytes, rehydration solutions, absorptiometry, photon, skinfold thickness, fluid therapy, severity of illness index, nutrition assessment, reproducibility of results, body composition, electric impedance, beverages, adult, female, male, physical exertion, hot temperature, young adult, athletes, sports nutritional physiological phenomena
2 autores
- Nidia Rodríguez-Sánchez🇬🇧University of Stirling
- Stuart D. R. Galloway🇬🇧 · autor de correspondenciaUniversity of Stirling
Resumen
El texto original del estudio, en el idioma en que se publicó.
Dual energy x-ray absorptiometry (DXA) is a popular tool to determine body composition (BC) in athletes, and is used for analysis of fat-free soft tissue mass (FFST) or fat mass (FM) gain/loss in response to exercise or nutritional interventions. The aim of the current study was to assess the effect of exercise-heat stress induced hypohydration (HYP, >2% of body mass (BM) loss) vs. maintenance of euhydration (EUH) on DXA estimates of BC, sum of skinfolds (SF), and impedance (IMP) measurements in athletes. Competitive athletes (23 males and 15 females) recorded morning nude BM for 7 days before the first main trial. Measurements on the first trial day were conducted in a EUH condition, and again after exercise-heat stress induced HYP. On the second trial day, fluid and electrolyte losses were replaced during exercise using a sports drink. A reduction in total BM (1.6 ± 0.4 kg; 2.3 ± 0.4% HYP) and total FFST (1.3 ± 0.4 kg), mainly from trunk (1.1 ± 0.5 kg), was observed using DXA when participants were HYP, reflecting the sweat loss. Estimated fat percent increased (0.3 ± 0.3%), however, total FM did not change (0.1 ± 0.2 kg). SF and IMP declined with HYP (losses of 1.5 ± 2.9% and 1.6 ± 3% respectively) suggesting FM loss. When EUH was maintained there were no significant changes in BM, DXA estimates, or SF values pre to post exercise, but IMP still declined. We conclude that use of DXA for FFST assessment in athletes must ensure a EUH state, particularly when considering changes associated with nutritional or exercise interventions.
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