Validity and reproducibility of a novel method for timecourse evaluation of diet-induced thermogenesis in a respiratory chamber

Chiyoko Usui, Takafumi Ando, Kazunori Ohkawara, Rieko Miyake, Yoshitake Oshima, Masanobu Hibi, Sachiko Oishi, Kumpei Tokuyama, Shigeho Tanaka

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

We developed a novel method for computing diet-induced thermogenesis (DIT) in a respiratory chamber and evaluated the validity and reproducibility of the method. We hypothesized that DIT may be calculated as the difference between postprandial energy expenditure (EE) and estimated EE (sum of basal metabolic rate and physical activity (PA)-related EE). The estimated EE was derived from the regression equation between EE from respiration and PA intensity in the fasting state. It may be possible to evaluate the time course of DIT using this novel technique. In a validity study, we examined whether DIT became zero (theoretical value) for 6 h of fasting in 11 subjects. The mean value of DIT calculated by the novel and traditional methods was 22.4 ± 13.4 and 3.4 ± 31.8 kcal/6 h, respectively. In the reproducibility study, 15 adult subjects lived in the respiratory chamber for over 24 h on two occasions. The DIT over 15 h of postprandial wake time was calculated. There were no significant differences in the mean values of DIT between the two test days. The within-subject day-to-day coefficient of variation for calculated DIT with the novel and traditional methods was approximately 35% and 25%, respectively. The novel method did not have superior reproducibility compared with that of the traditional method. However when comparing the smaller variation in the fasting state than the theoretical value (zero), the novel method may be better for evaluating interindividual differences in DIT than the traditional method and also has the ability to evaluate the time-course.

Original languageEnglish
Article numbere12410
JournalPhysiological Reports
Volume3
Issue number5
DOIs
Publication statusPublished - 2015 Jan 1
Externally publishedYes

Keywords

  • Diet-induced thermogenesis
  • Reproducibility
  • Respiratory chamber
  • Triaxial accelerometry
  • Validity

ASJC Scopus subject areas

  • Physiology
  • Physiology (medical)

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