NCT04320446

Caffeine Increases Maximal Fat Oxidation During Exercise in Endurance-trained Men: is There a Diurnal Variation

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 15 (actual)
• Sponsor: Universidad de Granada · Academic / Other
• Sex: Male
• Age: 18 Years – 40 Years
• Healthy volunteers: Accepted

Summary

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.

Detailed description

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

Conditions

• Energy Metabolism
• Athletic Performance

Interventions

Type	Name	Description
BEHAVIORAL	Test in the morning	The exercise test was performed between 8 a.m and 11 a.m
BEHAVIORAL	Test in the afternoon	The exercise test was performed between 5 p.m. and 8 p.m.a

Timeline

• Start date: 2019-06-01
• Primary completion: 2019-11-30
• Completion: 2019-11-30
• First posted: 2020-03-25
• Last updated: 2020-03-25

Locations

1 site across 1 country: Spain