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Article Publish Status: FREE
Abstract Title:

Caffeine Affects Time to Exhaustion and Substrate Oxidation during Cycling at Maximal Lactate Steady State.

Abstract Source:

Nutrients. 2015 ;7(7):5254-64. Epub 2015 Jun 30. PMID: 26133971

Abstract Author(s):

Rogério Santos de Oliveira Cruz, Rafael Alves de Aguiar, Tiago Turnes, Luiz Guilherme Antonacci Guglielmo, Ralph Beneke, Fabrizio Caputo

Article Affiliation:

Rogério Santos de Oliveira Cruz

Abstract:

This study analyzed the effects of caffeine intake on whole-body substrate metabolism and exercise tolerance during cycling by using a more individualized intensity for merging the subjects into homogeneous metabolic responses (the workload associated with the maximal lactate steady state-MLSS). MLSS was firstly determined in eight active males (25± 4 years, 176 ± 7 cm, 77 ± 11 kg) using from two to four constant-load tests of 30 min. On two following occasions, participants performed a test until exhaustion at the MLSS workload 1 h after taking either 6 mg/kg of body mass of caffeine or placebo (dextrose), in a randomized, double-blindedmanner. Respiratory exchange ratio was calculated from gas exchange measurements. There was an improvement of 22.7% in time to exhaustion at MLSS workload following caffeine ingestion (95% confidence limits of ±10.3%, p = 0.002), which was accompanied by decrease in respiratory exchange ratio (p =0.001). These results reinforce findings indicating that sparing of the endogenous carbohydrate stores could be one of the several physiological effects of caffeine during submaximal performance around 1 h.

Study Type : Human Study
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Depression: 21st Century Solutions + The Dark Side of Wheat

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