Parallel assessment of nutrition and activity in athletes: validation against doubly labelled water, 24-h urea excretion, and indirect calorimetry

Karsten Köhler, Hans Braun, Markus Marées, de, Gerhard Fusch, Christoph Fusch, Joachim Mester, Wilhelm Schänzer

Publication: Contribution to journalJournal articlesResearchpeer-review

Abstract

The assessment of nutrition and activity in athletes requires accurate and precise methods. The aim of this study was to validate a protocol for parallel assessment of diet and exercise against doubly labelled water, 24-h urea excretion, and respiratory gas exchange. The participants were 14 male triathletes under normal training conditions. Energy intake and doubly labelled water were weakly associated with each other (r = 0.69, standard error of estimate [SEE] = 304 kcal x day(-1)). Protein intake was strongly correlated with 24-h urea (r = 0.89) but showed considerable individual variation (SEE = 0.34 g kg(-1) x day(-1)). Total energy expenditure based on recorded activities was highly correlated with doubly labelled water (r = 0.95, SEE = 195 kcal x day(-1)) but was proportionally biased. During running and cycling, estimated exercise energy expenditure was highly correlated with gas exchange (running: r = 0.89, SEE = 1.6 kcal x min(-1); cycling: r = 0.95, SEE = 1.4 kcal x min(-1)). High exercise energy expenditure was slightly underestimated during running. For nutrition data, variations appear too large for precise measurements in individual athletes, which is a common problem of dietary assessment methods. Despite the high correlations of total energy expenditure and exercise energy expenditure with reference methods, a correction for systematic errors is necessary for the valid estimation of energetic requirements in individual athletes.

Original languageEnglish
JournalJournal of Sports Sciences
Volume28
Issue number13
Pages (from-to)1435-1449
Number of pages15
ISSN0264-0414
DOIs
Publication statusPublished - 01.11.2010

Research areas and keywords

  • Adult
  • Athletes
  • Bicycling
  • Biological Markers
  • Body Water
  • Calorimetry, Indirect
  • Diet
  • Dietary Proteins
  • Energy Intake
  • Energy Metabolism
  • Exercise
  • Humans
  • Male
  • Nutrition Assessment
  • Pilot Projects
  • Running
  • Urea
  • Young Adult

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