Role of cardiorespiratory fitness and muscular strength in maximal fatoxidation in young adults

  1. Opazo-Diaz E. 1
  2. Velázquez-Díaz D. 2
  3. Pérez-Bey A. 2
  4. Corral-Roman J. 1
  5. Marín-Galindo A. 2
  6. Montes-De-Oca A 2
  7. Costilla M. 2
  8. Ponce-González JG. 2
  1. 1 Departament of Physical Therapy, Faculty of Medicine. University of Chile, Santiago, Chile.
  2. 2 MOVE-IT Research group. University of Cádiz, Cádiz, Spain. Department of Physical Education, Faculty of Education Sciences. University of Cádiz, Cádiz, Spain.
Actas:
XII Simposio Internacional de Fuerza y Proyecto IronFEMME

Editorial: Universidad Politécnica de Madrid

ISBN: 978-84-09-16216-1

Año de publicación: 2019

Páginas: 67-68

Tipo: Aportación congreso

GOOGLE SCHOLAR

Resumen

IntroductionIncrease fat oxidation capacity is a key objective in health and sport . It is known that variables indicators of fitness (2) are related to maximal fat oxidation (MFO) but is less clear if there is a role of the combined effect of CRF and strength in MFO. The aim of this study is to analyzethe independent and combined effect of CRF and muscular strength on MFO.Methodology81 young adults (51 males; mean age, 22.7±4.4years old) were included. An incremental exercise protocol in cycle ergometer with two consecutive phases was performed to determine MFO and VO2max using indirect calorimetry. The first phase aimed to determine MFO and consist in 3 min steps of 15/30W (depending on weight status) increments with a cadence of 60-80rpm. The test was stopped when RER ≥1. After 3-5 min rest, the second phase to detect the VO2max was initiated with steps of 1 min and same incremental load until exhaustion. Bioimpedance analysis was used to assess body composition (fat mass and fat free mass (FFM)), following the corresponding previous considerations. The muscular strength (MS) was assessed by handgrip dynamometry and distance in longitudinal jump test. Linear regression analyses were performed to determine the independent associations of CRF and MS on fat oxidation (MFO and MFO/ FFM) and sex interaction. ANCOVA was used to observedifferences between CRF and MS on MFO using combined groups separated by high/low CRF and high/low MS. Then, the differences in MFO between groups were studied by analysis of variance.ResultsMS/FFM and CRF were positively correlated with MFO/FFM (r= 0.23, p=0.04; r=0.57, p<0.001). No interaction between sex was found. Significative differences were observed between HighCRF/HighMS and LowCRF/LowMS (p<0.001), HighCRF/HighMS and LowCRF/HighMS (p=0.004) Discussion Maximal fat oxidation capacity is highly influenced by CRF, but the role of MS assessed by handgrip and longitudinal jump is not relevant. 1. Achten J, Jeukendrup A. Optimizing fat oxidation through exercise and diet. Nutrition. 2004; 20(7/8):716-727. 2. Venables M, Achten J, Jeukendrup A. Determinants of fat oxidation during exercise in healthy men and women: a cross-sectional study. J Appl Physiol 2005 Aug; 98(1):160-167.