King Grub
2019-02-01, 09:51
PURPOSE::
To analyze the diurnal variation of maximal fat oxidation (MFO) and the intensity that elicit MFO (Fatmax) in trained male athletes.
METHODS::
A total of 12 endurance-trained male athletes aged 24.7±4.1 participated in the study. We measured MFO, Fatmax, maximum oxygen uptake (VO2max) and oxygen uptake percentage at ventilatory threshold 2 (VT2) with a graded exercise protocol performed on two days separated by one week. One test was performed in the morning and the other in the afternoon. We assessed the participants' chronotype using the HÖME questionnaire.
RESULTS::
Our results indicate that MFO and Fatmax are greater in the afternoon than in the morning (Δ=13%, P<0.001 and Δ=6%, P=0.001, respectively), whereas there were similar VO2max and VT2 in the morning than in the afternoon test (Δ=0.2%, P=0.158 and Δ=7%, P=0.650, respectively). There was a strong positive association between VO2max and MFO in both morning and afternoon assessments (R2=0.783; P=0.001 and R2=0.663; P<0.001, respectively). Similarly, there was a positive association between VO2max with Fatmax in both morning and afternoon assessment (R2=0.406; P=0.024 and R2=0.414; P=0.026, respectively).
CONCLUSIONS::
These findings suggest that the diurnal variation of MFO and Fatmax may partially explain some of the observed diurnal variation in the performance of endurance sports.
Int J Sports Physiol Perform. 2019 Jan 31:1-20. Diurnal Variation of Maximal Fat Oxidation Rate in Trained Male Athletes.
To analyze the diurnal variation of maximal fat oxidation (MFO) and the intensity that elicit MFO (Fatmax) in trained male athletes.
METHODS::
A total of 12 endurance-trained male athletes aged 24.7±4.1 participated in the study. We measured MFO, Fatmax, maximum oxygen uptake (VO2max) and oxygen uptake percentage at ventilatory threshold 2 (VT2) with a graded exercise protocol performed on two days separated by one week. One test was performed in the morning and the other in the afternoon. We assessed the participants' chronotype using the HÖME questionnaire.
RESULTS::
Our results indicate that MFO and Fatmax are greater in the afternoon than in the morning (Δ=13%, P<0.001 and Δ=6%, P=0.001, respectively), whereas there were similar VO2max and VT2 in the morning than in the afternoon test (Δ=0.2%, P=0.158 and Δ=7%, P=0.650, respectively). There was a strong positive association between VO2max and MFO in both morning and afternoon assessments (R2=0.783; P=0.001 and R2=0.663; P<0.001, respectively). Similarly, there was a positive association between VO2max with Fatmax in both morning and afternoon assessment (R2=0.406; P=0.024 and R2=0.414; P=0.026, respectively).
CONCLUSIONS::
These findings suggest that the diurnal variation of MFO and Fatmax may partially explain some of the observed diurnal variation in the performance of endurance sports.
Int J Sports Physiol Perform. 2019 Jan 31:1-20. Diurnal Variation of Maximal Fat Oxidation Rate in Trained Male Athletes.