Maximal fat oxidation during exercise (MFO) and the intensity of exercise that elicits MFO (Fatmax) has been recognized as potential determinants of endurance performance. The purpose of this study was to determine the possible interaction between the effects of diurnal variation (morning vs. afternoon) and caffeine ingestion on MFO, Fatmax and VO2 max in endurance-trained men. Specifically, the investigators sought to elucidate whether the stimulant actions of caffeine could reverse the decrements of MFO and Fatmax observed in the morning.
Body weight, height, body composition (DXA), exercise test (MFO and VO2max assessment) will be measured during the 4 evaluations. Participants were randomized into 4 exercise test conditions: 1. Exercise test in the morning with placebo intake 2. Exercise test in the evening with placebo intake 3. Exercise test in the morning with caffeine intake 4. Execrise test in the evening with caffeine intake
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
TRIPLE
Enrollment
15
The exercise test was performed between 8 a.m and 11 a.m
The exercise test was performed between 5 p.m. and 8 p.m.a
Instituto Mixto Universitario Deporte Salud
Granada, Spain
MFO
Maximal fat oxidation during exercise
Time frame: Through study completion, an average of 1 month
FATmax
The intensity of exercise that elicits MFO
Time frame: Through study completion, an average of 1 month
VO2max
Cardiorrespiratory fitness measured by maximal oxygen uptake
Time frame: Through study completion, an average of 1 month
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