Maximal Fat Oxidation and Kinetics Calculation R package MFO version 0.2.1 Computes the maximal fat oxidation (MFO), the exercise intensity that elicits it (Fatmax), the Fatmax zone and the crossover point from indirect calorimetry data of a graded exercise test. Substrate oxidation is estimated with the stoichiometric equations of Frayn (1983) <doi:10.1152/jappl.1983.55.2.628>, Peronnet and Massicotte (1991, Can J Sport Sci 16(1):23-29) or Jeukendrup and Wallis (2005) <doi:10.1055/s-2004-830512>, and Fatmax is located with a third- or second-degree polynomial, the measured values or the MRER method. Fat oxidation kinetics are described with the SIN model of Cheneviere et al. (2009) <doi:10.1249/MSS.0b013e31819e2f91>, which returns dilatation, symmetry and translation, together with the intensity at which fat oxidation becomes negligible (Fatmin). Applications of these methods are given in Achten et al. (2002) <doi:10.1097/00005768-200201000-00015> and Montes de Oca et al. (2021) <doi:10.1080/17461391.2020.1788650>. Software Depends: R (>= 4.1.0) Imports: stats, dplyr, ggplot2, tibble, minpack.lm, openxlsx, readxl, tidyr Suggests: covr, knitr, rmarkdown, testthat (>= 3.0.0), withr Jorge R Fernandez-Santos <jorgedelrosario.fernandez@uca.es> Comprehensive R Archive Network (CRAN) Jorge R Fernandez-Santos [aut, cre] (ORCID: <https://orcid.org/0000-0002-5047-2976>), Jesus G Ponce-Gonzalez [ctb] (ORCID: <https://orcid.org/0000-0002-5982-7761>), Cristina Casals [ctb] (ORCID: <https://orcid.org/0000-0002-6992-0492>), Jose L Gonzalez-Montesinos [ctb] (ORCID: <https://orcid.org/0000-0002-6867-7718>), Juan Corral-Perez [ctb] (ORCID: <https://orcid.org/0000-0002-6574-9827>), Alejandro Perez-Bey [ctb] (ORCID: <https://orcid.org/0000-0002-9849-5544>) MIT + file LICENSE (https://CRAN.R-project.org/package=MFO/LICENSE) 2026-11-12 application/tgz https://CRAN.R-project.org/package=MFO doi:10.32614/CRAN.package.MFO en-GB