Accelerometer-measured physical activity and sedentary time are associated with maximal fat oxidation in young adults

The present work aimed to examine the association between physical activity (PA) and sedentary behaviour with maximal fat oxidation (MFO) in young individuals. A total of 77 active adults (30 women; 22.8 ± 4.5 years) were included in this cross-sectional study in which PA and sedentary behaviour wer...

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Published inEuropean journal of sport science Vol. 22; no. 10; pp. 1595 - 1604
Main Authors Corral-Pérez, Juan, Velázquez-Díaz, Daniel, Perez-Bey, Alejandro, Montes-de-Oca-García, Adrián, Fernandez-Santos, Jorge R., Amaro-Gahete, Francisco J., Jiménez-Pavón, David, Casals, Cristina, Ponce-González, Jesús G.
Format Journal Article
LanguageEnglish
Published Routledge 03.10.2022
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Summary:The present work aimed to examine the association between physical activity (PA) and sedentary behaviour with maximal fat oxidation (MFO) in young individuals. A total of 77 active adults (30 women; 22.8 ± 4.5 years) were included in this cross-sectional study in which PA and sedentary behaviour were measured using accelerometers for 7 consecutive days. PA was classified into different intensities (i.e. light, moderate, vigorous, and moderate-to-vigorous) and sedentary behaviour into sedentary time (i.e. time, number of bouts, and length of bouts) and sedentary breaks (i.e. time, number of breaks, and length of breaks). MFO was determined using a graded cycloergometer test through indirect calorimetry and relativized to lean mass (MFO LM ) and lean leg mass (MFO LL ). Positive associations were found for light and vigorous PA in relation with MFO, MFO LM and MFO LL , independently of cofounders (P ≤ 0.01). Moreover, a negative association was found between MFO and MFO LM and the length of sedentary bouts which was accentuated after adjusting by cardiorespiratory fitness (P ≤ 0.05). These results suggest that light and vigorous PA and sedentary behaviour are related to MFO during exercise. Despite this, further interventional studies are needed to clarify if increments of light and vigorous PA could enhance MFO in different populations.
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ISSN:1746-1391
1536-7290
DOI:10.1080/17461391.2021.1953149