@misc{10481/60107,
year = {2019},
month = {7},
url = {http://hdl.handle.net/10481/60107},
abstract = {Maximal fat oxidation during exercise (MFO) and the exercise intensity eliciting MFO (Fatmax) are considered important factors related to metabolic health and performance. Numerous MFO and Fatmax data collection and analysis approaches have been applied, which may have influenced their estimation during an incremental graded exercise protocol. Despite the heterogeneity of protocols used, all studies consistently stopped the MFO and Fatmax test when the respiratory exchange ratio (RER) was 1.0. It remains unknown however whether reaching a RER of 1.0 is required to have an accurate, reliable, and valid measure of MFO and Fatmax. We aimed to investigate the RER at which MFO and Fatmax occurred in sedentary and trained healthy adults. A total of 166 sedentary adults aged between 18 and 65 years participated in the study. MFO and Fatmax were calculated by an incremental graded exercise protocol before and after two exercise-based interventions. Our findings suggest that a graded exercise protocol aiming to determine MFO and Fatmax could end when a RER = 0.93 is reached in sedentary healthy adults, and when a RER = 0.90 is reached in trained adults independently of sex, age, body weight status, or the Fatmax data analysis approach. In conclusion, we suggest reducing the RER from 1.0 to 0.95 to be sure that MFO is reached in outliers. This methodological consideration has important clinical implications, since it would allow to apply smaller workload increments and/or to extend the stage duration to attain the steady state, without increasing the test duration.},
organization = {This study was supported by the Spanish Ministry of Economy
and Competitiveness via the Fondo de Investigación Sanitaria
del Instituto de Salud Carlos III (PI13/01393), Retos de la
Sociedad (DEP2016-79512-R) and European Regional
Development Funds (ERDF), the Spanish Ministry of Education
(FPU 13/04365, FPU14/04172), the Spanish Ministry of Education
and Science (Red EXERNET DEP2005-00046), the Fundación
Iberoamericana de Nutrición (FINUT), the Redes Temáticas
de Investigación Cooperativa RETIC (Red SAMID RD16/0022),
the AstraZeneca HealthCare Foundation, the University of
Granada Plan Propio de Investigación 2016 – Excellence actions:
Unit of Excellence on Exercise and Health (UCEES) – and
Plan Propio de Investigación 2018 – Programa Contratos-Puente,
and the Junta de Andalucía, Consejería de Conocimiento,
Investigación y Universidades (ERDF: ref. SOMM17/6107/UGR).},
publisher = {Frontiers Media},
keywords = {Maximal fat oxidation},
keywords = {Fatmax},
keywords = {Peak fat oxidation},
keywords = {Methodology},
keywords = {RER},
title = {Optimizing Maximal Fat Oxidation Assessment by a Treadmill-Based Graded Exercise Protocol: When Should the Test End?},
doi = {10.3389/fphys.2019.00909},
author = {Amaro Gahete, Francisco José and Sánchez-Delgado, Guillermo and Helge, Jorn W. and Ruiz Ruiz, Jonatan},
}