Maximal fat oxidation: independent and combined role of physical fitness in adults

  1. Edgardo Opazo-Diaz
  2. María Rebollo Ramos
  3. Alberto Marín Galindo
  4. Pablo Santiago Arriaza
  5. Manuel Jesús Costilla Macías
  6. Adrián Montes De Oca García
  7. José Ignacio Orellana Pecino
  8. Jesús Gustavo Ponce González
  9. Juan Corral Pérez
  10. Cristina Casals Vázquez
Proceedings:
VII Congreso Internacional en Contextos Clínicos y de la Salud

Publisher: ASUNIVEP

ISBN: 978-84-09-32278-7

Year of publication: 2021

Pages: 9

Type: Conference paper

GOOGLE SCHOLAR

Abstract

INTRODUCCIÓN: Metabolic flexibility has been defined as the ability of cells to oxidize fat for energy production, which is important for health and performance. However, little is known about the influence of the different physical fitness components on fat oxidation. OBJETIVOS: The aim of this study is to analyze the independent and combined effect of physical fitness: body composition (BC), cardiorespiratory fitness (CRF), and muscular strength (MS) on maximal fat oxidation (MFO) in young adults. METODOLOGÍA: Eighty-one adults (51 males; age 22.8 ±4.4Y) were included. An incremental exercise protocol in a cycle-ergometer with two consecutive phases was performed for MFO and VO2max using indirectcalorimetry. The first phase aimed to determine MFO, it consisted of 3min steps of 15/30W (depending on weight status) increments with a cadence of 60-80rpm. The test was stopped when RQ ≥1. After 5 min rest, the second phase to detect VO2max began with steps of 1min and the same incremental load until exhaustion. Bioimpedance analysis was used to assess BC (fat mass (FM) and lean mass (LM)). MS was assessed byhandgrip dynamometry (HG) and the standing long-jump test (LJ). Pearson correlation test was made to study the independent role of variables on MFO, and stepwise linear regression models were made to explain the combined role of BC, MS and CRF with MFO. RESULTADOS: MFO was directly correlated with LJ (r=0.328, P=0.004) And VO2max (r=0.604, P<0.001). And inversely with FM (r=-0.246, P=0.029). The best linear regression model included VO2max, LM and FM, and explained 0.49% Of the MFO variability. CONCLUSIÓN: CRF is the physical fitness most important factor for explaining MFO, but there is an independent role for lower limb strength and FM. The combined effect of CRF and BC are the best model to explain absolute MFO.