Caffeine effects on VO2max test outcomes investigated by a placebo perceived-as-caffeine design
Brietzke C, Asano RY, De Russi de Lima F, Pinheiro FA, Franco-Alvarenga, Ugrinowitsch C, Pires FO
Nutrition and health · 22 citations
How it was studied
- Design
- Randomized controlled trial (indexed by PubMed)
- Studied in
- People
- Main outcome
- Health markers and function
Who paid for it
- Funding
- Independent funding
- Government
- Fundação de Amparo à Pesquisa do Estado de São Paulo
- Government
- Coordenação de Aperfeiçoamento de Pessoal de Nível Superior
- Government
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo
- Grants
- Fundação de Amparo à Pesquisa do Estado de São Paulo (2010/01317-0)
Based on 3 listed funder(s).
Publication
- Published
- 2017-12-01 · Nutr Health · vol. 23 · issue 4 · pp. 231–238
- Publisher
- SAGE Publishing
- Cited
- 30 citations · more than 70% of similar papers · 0.8× the field average
- References
- 49 works
- Access
- Paywalled
- Research areas
- Muscle metabolism and nutrition · Cardiovascular and exercise physiology · Sports Performance and Training
- Keywords
- Caffeine, Placebo, Ingestion, Perceived exertion, Medicine, VO2 max, Internal medicine, Cycling, Endocrinology, Animal science, Cardiology, Physical therapy, Heart rate, Blood pressure, Biology
- MeSH
- leg, humans, fatigue, caffeine, central nervous system stimulants, severity of illness index, reproducibility of results, single-blind method, attitude to health, deception, oxygen consumption, time factors, bicycling, dietary supplements, adult, athletic performance, physical exertion, young adult, performance-enhancing substances, musculoskeletal pain
7 authors
From BR
- Cayque BrietzkeUniversidade de São Paulo
- Ricardo Yukio AsanoUniversidade de São Paulo
- Felipe De Russi de LimaUniversidade de São Paulo
- Fabiano Aparecido PinheiroUniversidade de São Paulo
- Paulo Estevão Franco‐AlvarengaUniversidade de São Paulo
- Carlos UgrinowitschUniversidade de São Paulo
Abstract
Background
Ergogenic effects of caffeine (CAF) ingestion have been observed in different cycling exercise modes, and have been associated with alterations in ratings of perceived exertion (RPE). However, there has been little investigation of maximal oxygen uptake (VO2MAX) test outcomes.
Aim
This study aimed to verify whether CAF may reduce RPE, thereby improving maximal incremental test (MIT) outcomes such as VO2MAX, time to exhaustion and peak power output (WPEAK).
Methods
Nine healthy individuals performed three MITs (25 W/min until exhaustion) in a random, counterbalanced fashion after ingestion of CAF, placebo perceived as caffeine (PLA), and no supplementation (baseline control). VO2 was measured throughout the test, while RPE was rated according to overall and leg effort sensations. The power output corresponding to submaximal (RPE = 14 according to the 6-20 Borg scale) and maximal RPE was recorded for both overall (O-RPE14 and O-RPEMAX) and leg RPE (L-RPE14 and L-RPEMAX).
Results
VO2MAX did not change significantly between MITs; however, CAF and PLA increased time to exhaustion (↑ ∼18.7% and ∼17.1%, respectively; p PEAK (↑ ∼13.0% and ∼11.8%, respectively; p MAX and L-RPEMAX) than submaximal RPE (possibly beneficial in O-RPE14 and L-RPE14). Similar results were found when participants ingested PLA.
Conclusions
Compared with control, CAF and PLA improved MIT performance outcomes such as time to exhaustion and WPEAK, without altering VO2MAX values. CAF effects were attributed to placebo.
Abstract via Europe PMC. Copyright remains with the authors or publisher.
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