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Study Title and Description

Influence of caffeine, cold and exercise on multiple choice reaction time.



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 Influence of caffeine, cold and exercise on multiple choice reaction time.
Author B Kruk,J Chmura,K Krzeminski,AW Ziemba,K Nazar,H Pekkarinen,H Kaciuba-Uscilko,
Country
Year 2001
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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 investigation was to find out whether ingestion of caffeine in the form of instant coffee exerts any influence on psychomotor performance during exercise and if so, whether this influence depends on thermal conditions under which the exercise is performed.
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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) Subjects Nine healthy male soccer players, members of the Polish 3rd league team [weight: 71.9±7.2 kg], participated in this study. Before the investigations the subjects consumed coffee only occasionally (1–2 times per month). Experimental Procedure The subjects, familiarized with the laboratory conditions and testing procedure, were asked to limit their physical activity and abstain from coffee consumption for 24 h prior to testing. All the trials were conducted at the same time of the day. Each subject reported to the laboratory on four occasions separated by approximately 1 week. The subjects ingested instant coffee with 5 mg/kg caffeine or caffeine-free coffee in a double blind manner, and then rested for 60 min at a comfortable ambient temperature. After the resting period, the subjects performed, in randomized order, graded incremental exercise tests either at an ambient temperature of 4°C (70% relative humidity) or at 22°C (60% relative humidity), in a temperature and humidity-regulated chamber. The exercise tests were performed on a bicycle ergometer (Siemens, Germany), with a load increasing by 50 W every 3 min until volitional exhaustion, starting from 50 W at 60 revolutions per min. Heart rate (HR) was recorded continuously throughout all exercise tests using Sport Tester PE 3000 (Polar Electro, Finland). Statistics The data are presented as means with standard errors (SE). Significance of temperature (4°C and 22°C) or drug (caffeine or placebo) effects within each workload were analyzed by 2x2x7 ANOVA for repeated measures. Paired Student’s t-test was used for the post hoc analysis in the event of a significant F ratio. Statistical significance was assumed for P<0.05.
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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 (HR) was recorded continuously throughout all exercise tests using Sport Tester PE 3000 (Polar Electro, 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?
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What was the reference, comparison, or control group(s)? (e.g. high vs low consumption, number of cups, etc.) Each subject served as their own control (placebo)
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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) None
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What conflicts of interest were reported? No information provided
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Refid 11594446
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What were the sources of funding? No information provided
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Results & Comparisons

No Results found.