Trial reportNutrients2021
Placebo Effect of Caffeine on Substrate Oxidation during Exercise.
Trial report in Nutrients, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 11 papers, 2 of them syntheses that pooled it.
What it found
Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.
The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.
Who cites it
11 citing papers in PubMed, 2 syntheses or guidelines pooled it, 14 citations in OpenAlex.
- Pooled it
- Effect of Acute Caffeine Intake on Fat Oxidation Rate during Fed-State Exercise: A Systematic Review and Meta-Analysis.Nutrients · 2024Pooled it
- Trial
- Repeated mouth rinsing of coffee improves the specific-endurance performance and jump performance of young male futsal players.Journal of the International Society of Sports Nutrition · 2023Trial
- Trial
- Distinguishing caffeine expectancy from pharmacological effects: a comparative review of experimental designs with future directions.Frontiers in physiology · 2026Review
- Caffeine Effects on Physical Performance and Sport-Specific Skills in Elite Youth Soccer Players: A Randomised Trial Using the Balanced Placebo Design.Sports (Basel, Switzerland) · 2025Article
- Does mental exertion during incremental exercise change substrate oxidation and cardiorespiratory outcomes in individuals with overweight?Physiological reports · 2025Article
- Low and High Doses of Espresso Coffee Improve Repeated Sprint Performance and Eye-Hand Coordination Following Fatigue Status in Male Basketball Players.Current developments in nutrition · 2024Article
- Effect of 3 and 6 mg/kg of caffeine on fat oxidation during exercise in healthy active females.Biology of sport · 2023Article
- The effect of beetroot juice (Beta Vulgaris L.) supplementation on ṼO2max of youth soccer athletes.Journal of public health in Africa · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
8 authors at 5 institutions in 2 countries.
Funding
Abstract
By using deceptive experiments in which participants are informed that they received caffeine when, in fact, they received an inert substance (i.e., placebo), several investigations have demonstrated that exercise performance can be enhanced to a similar degree as a known caffeine dose. This 'placebo effect' phenomenon may be part of the mechanisms explaining caffeine's ergogenicity in exercise. However, there is no study that has established whether the placebo effect of caffeine is also present for other benefits obtained with acute caffeine intake, such as enhanced fat oxidation during exercise. Therefore, the aim of this investigation was to investigate the placebo effect of caffeine on fat oxidation during exercise. Twelve young men participated in a deceptive double-blind cross-over experiment. Each participant completed three identical trials consisting of a step incremental exercise test from 30 to 80% of V.O
Indexed as
Identifiers
What Socratic holds
Registered trials
Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the Socratic graph.