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Study Title and Description

The effect of caffeine ingestion on mood state and bench press performance to failure.



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 effect of caffeine ingestion on mood state and bench press performance to failure.
Author MJ Duncan,SW Oxford,
Country
Year 2011
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)? This study examined the effect of caffeine (5 mg/kg) vs. placebo on bench press exercise to failure and the mood state response pre to postexercise.
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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) Experimental approach to the problem: This study employed a within-subjects, repeated-measures design. Subjects were informed they were participating in a study examining the effect of an ergogenic aid on resistance exercise performance and that as part of the experiment, they would be asked to perform a 1RMtest on the bench press and 2 subsequent testing sessions where they would be required to perform bench press exercise to failure at an intensity of 60% 1RM after ingestion of a sports drink or a placebo but that they would not be informed in what order which drink was consumed. Likewise, the investigator administering the solutions was naive to which order they were taken in by subjects. All testing took place within the institution’s human performance laboratory. Subjects: All participants competed in team games (rugby union, football, basketball) at University (i.e., national) level and had been competing in their respective sports for a mean time of 10.4 6 2.3 years. They were provided with a list of dietary substances containing caffeine and were asked not to consume caffeine after 6:00 PM the night before testing to control for the effects of caffeine already consumed (31). Procedure: Each participant attended the human performance laboratory on 3 occasions. All testing took place between 9.00 AM and 12.00 PM, and each condition took place at the same time for each participant to avoid circadian variation. Conditions were presented in a randomized order and were separated by 24–72 hours. Conditions were randomized and consisted of a caffeine condition where 5 mg/kg of caffeine diluted into 250 mL of artificially sweetened water and a placebo condition where 250 mL of artificially sweetened water drink was consumed. Solutions were consumed 60 minutes before each exercise trial because plasma caffeine concentration is maximal 1 hour after ingestion of caffeine (23). Each solution was presented to participants in an opaque sports bottle to prevent the researchers who administered the solutions or the participants consuming the solutions from actually seeing the solutions themselves. During each condition, repetitions were counted using a hand tally counter (Tamaco Ltd, Tokyo, Japan) and PHR was assessed using heart rate telemetry (Polar Electro Oy, Kempele, Finland).
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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) Peak 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 During each condition, repetitions were counted using a hand tally counter (Tamaco Ltd, Tokyo, Japan) and PHR was assessed using heart rate telemetry (Polar Electro Oy, Kempele, Finland).
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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.) Placebo exposure.
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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) Because the aims of this study were to assess the effect of acute caffeine ingestion on resistance exercise to failure, and RPE and mood state pre to postexercise, any changes in total repetitions completed, totalweight lifted and RPE and physiological indices assessed during the experimental conditions (PHR and PBla), across the caffeine and placebo conditions were analyzed using paired samples t-tests for each variable. Post Hoc analysis using Bonferroni adjustments were performed where any significant interactions and main effects were found.
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What conflicts of interest were reported? Not discussed.
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Refid 21157384
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What were the sources of funding? Not discussed.
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Results & Comparisons

No Results found.