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Influence of the Time of Day in the Effect of Caffeine on Maximal Fat Oxidation During Exercise in Women — CIRCAF_WOM  

Dietary Supplement Clinical Trial

Official title:
Influence of the Time of Day in the Effect of Caffeine on Maximal Fat Oxidation During Exercise in Women. A Randomized, Crossover, Double-blind, and Placebo-controlled Study

Clinical Trial Summary

Caffeine is a natural stimulant with well-recognized metabolic benefits, however, there is a lack of studies investigating the time-of-day caffeine influence to enhance fat oxidation in women. The aim of this study was to evaluate the influence of the time of the day on the effect of caffeine on maximal rate of fat oxidation during aerobic exercise in women.

Clinical Trial Description

Caffeine is a natural stimulant with well-recognized sports performance benefits. Aside its performance-enhancing effect, caffeine has the potential of increasing fat utilization during aerobic exercise at submaximal intensities, lowering-down the contribution of carbohydrate as a fuel. This property of caffeine may provoke a glycogen-sparing effect in the skeletal muscle and liver for exercise situations where carbohydrate availability may be a challenge. Additionally, the capacity of caffeine to enhance fat utilization during exercise could be of interest for improving health outcomes as it may increase the rate of change in body composition in exercise programs. Maximal fat oxidation rate (MFO) during exercise is a remarkable physiological indicator associated with metabolic flexibility/body weight loss and endurance performance To date, it is unknown if caffeine increases MFO in the same proportion during morning and evening exercise trials in women. For this reason, the aim of the present study was to evaluate the influence of the time of the day on the effect of caffeine on MFO in women. We hypothesised that caffeine would increase MFO during morning and evening exercise and this effect would be of similar magnitude at both times of day. ;

Study Design

Related Conditions & MeSH terms

Clinical Trial Details
NCT number NCT05880186
Study type Interventional
Source Universidad Francisco de Vitoria
Contact
Status Completed
Phase N/A
Start date February 9, 2021
Completion date April 9, 2021
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