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Study Title and Description

The effects of caffeine ingestion on time trial cycling performance.



Key Questions Addressed
1 For [population], is caffeine intake above [exposure dose], compared to intakes [exposure dose] or less, associated with adverse effects on cardiovascular outcomes?
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Primary Publication Information
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TitleData
Title The effects of caffeine ingestion on time trial cycling performance.
Author LR McNaughton,RJ Lovell,J Siegler,AW Midgley,L Moore,DJ Bentley,
Country
Year 2008
Numbers

Secondary Publication Information
There are currently no secondary publications defined for this study.


Extraction Form: Cardiovascular Design
Design Details
Question... Follow Up Answer Follow-up Answer
What outcome is being evaluated in this paper? Cardiovascular
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What is the objective of the study (as reported by the authors)? The aim of this study was to investigate whether caffeine would improve the performance of well-trained cyclists undertaking high intensity aerobic work interspersed with high intensity activity, such as that seen in time trial (TT) cycling.
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Provide a general description of the methods as reported by the authors. Information should be extracted based on relevance to the SR (i.e., caffeine related methods) Performance testing: Participants reported to the temperature-controlled laboratory for testing on the prescribed day between 1300 and 1800 each day but always at the same time. The course was designed to ensure 60 minutes of continuous cycling at a 2% grade, with a number of hills (every 5k for a distance of 0.25k and 8% grade) to ensure maximal work. Subjects were instructed to cover as much distance as possible within the hour, and there was financial reward offered for the furthest distance traveled over the course of the study. All testing took place in a randomized, double-blind manner. After resting for 2 hours subjects undertook 1 of the 3 tests, the control (C), the placebo (P), or the caffeine (CAF) trial. In the CAF trial, each subject ingested 6 mg/kg body mass of caffeine given in low-kilojoule flavored drink, while in the P trial they consumed only the drink. As previously, heart rate was continuously measured with a heart rate monitor (Polar s810, Polar, Kempele, Finland). Tests were always completed with at least 48 hours but no more than 96 hours break.
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How many outcome-specific endpoints are evaluated? 1
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What is the (or one of the) endpoint(s) evaluated? (Each endpoint listed separately) Heart rate
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List additional health endpoints (separately). 2
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List additional health endpoints (separately).3
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List additional health endpoints (separately).4
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List additional health endpoints (separately).5
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List additional health endpoints (separately).6
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Clinical, physiological, other Physiological
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What is the study design? Controlled Trial
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Randomized or Non-Randomized? RCT
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What were the diagnostics or methods used to measure the outcome? Objective
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Optional: Name of Method or short description Heart rate was continuously measured with a heart rate monitor, with the receiver built into the Cosmed Quark b2 metabolic cart. Heart rate and metabolic data were processed by the Cosmed data management software.
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Caffeine (general) Caffeine (general)
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Coffee, Chocolate, energy drink, gum, medicine/supplement, soda, tea, other?
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Measured or self reported? Measured
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Children, adolescents, adults, or pregnant included? Adults
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What was the reference, comparison, or control group(s)? (e.g. high vs low consumption, number of cups, etc.) Caffeine exposure was compare to control and placebo exposures. Subjects were their own controls. Subjects each were exposed to all three 'compounds.'
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What were the listed confounders or modifying factors as stated by the authors? (e.g. multi-variable components of models.  Copy from methods) The performance results of the three trials and the glucose, lactate, and heart rate data were analyzed by a 2-factor ANOVA with repeated measures.
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What conflicts of interest were reported? This was not discussed.
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Refid 19208924
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What were the sources of funding? This was not discussed.
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Results & Comparisons

No Results found.