Comparison of Selected Spirometric Systems for Measuring the Resting Metabolic Rate

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The resting metabolic rate (RMR) is predominantly known in a clinical context as an important factor for the use in bedridden patients. Recently, RMR became more relevant among athletes in the field of sports nutrition as part of the discussion on the relative energy deficiency in sport (RED-S). There is some evidence that the physiological RMR is lowered as a result of a low energy availability. In practice, RMR can be simply estimated using different formulas, which are based on anthropometric data (e.g. height, body mass, fat-free mass), or can be determined via indirect calorimetry measuring oxygen consumption and carbon dioxide production. To date, there is no clearly standardized procedure for the valid and reliable measurement of the RMR in the field of indirect calorimetry. Various publications, in which the RMR is examined as a criterion for a given RED-S, use different devices and different formulas. Still, due to a lack of data it is not clear to what extent these are comparable. In the present work, three spirometric systems were used to determine RMR: MetaMax 3B (Cortex, Leipzig, Germany), MasterScreen CPX (Vyaire, Hoechberg, Germany) and Q-NRG+ (Cosmed, Rome, Italy). The heart rate was measured simultaneously as well as the perception of the measurement was documented after the application of each device. 26 trained male and female subjects (25±3 y, 10±3 h/wk training) underwent three consecutive measurements over a single day in a randomized order. The results show a mean RMR measured by Cortex of 1870±323 kcal/d, Vyaire 1829±405 kcal/d and Cosmed of 1533±309 kcal/d. Cosmed shows a significant difference from Cortex and Vyaire (p < .001). There is a strong correlation between all devices (p < .001). There were no significant results on correlations between heart rate, perception of the measurement and the RMR outcome. The current study provides further evidence that RMR can highly vary within subjects when different systems are used. Therefore, repeated RMR measurements should always be performed with the same system following the same standardized instructions.
ZeitschriftInternational Journal of Sport Nutrition Exercise Metabolism
Seiten (von - bis)S1-3 - S1-4
PublikationsstatusVeröffentlicht - 2020
VeranstaltungInternational Sport + Exercise Nutrition Conference - Newcastle upon Tyne, Großbritannien / Vereinigtes Königreich
Dauer: 17.12.201919.12.2019

ID: 5558653


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