Evaluation of a graded exercise test to determine peak fat oxidation in individuals with low cardiorespiratory fitness

Applied Physiology, Nutrition, and Metabolism = Physiologie Appliquée, Nutrition Et Métabolisme
Oliver J Chrzanowski-SmithJavier T Gonzalez

Abstract

The maximal capacity to utilise fat (peak fat oxidation, PFO) may have implications for health and ultra-endurance performance and is commonly determined by incremental exercise tests employing 3-min stages. However, 3-min stages may be insufficient to attain steady-state gas kinetics, compromising test validity. We assessed whether 4-min stages produce steady-state gas exchange and reliable PFO estimates in adults with peak oxygen consumption < 40 mL·kg-1·min-1. Fifteen participants (9 females) completed a graded test to determine PFO and the intensity at which this occurred (FATMAX). Three short continuous exercise sessions (SCE) were then completed in a randomised order, involving completion of the graded test to the stage (i) preceding, (ii) equal to (SCEequal), or (iii) after the stage at which PFO was previously attained, whereupon participants then continued to cycle for 10 min at that respective intensity. Expired gases were sampled at minutes 3-4, 5-6, 7-8, and 9-10. Individual data showed steady-state gas exchange was achieved within 4 min during SCEequal. Mean fat oxidation rates were not different across time within SCEequal nor compared with the graded test at FATMAX (both p > 0.05). However, the graded test displa...Continue Reading

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Citations

Apr 1, 2019·Scandinavian Journal of Medicine & Science in Sports·Francisco J Amaro-GaheteJonatan R Ruiz
Feb 29, 2020·International Journal of Sport Nutrition and Exercise Metabolism·Campbell MenziesJames A Betts
Nov 2, 2019·European Journal of Applied Physiology·Jari E KarppinenUrho M Kujala
Jun 4, 2020·European Journal of Applied Physiology·Oliver J Chrzanowski-SmithJavier T Gonzalez

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