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Study Title and Description

Effect of caffeine ingestion after creatine supplementation on intermittent high-intensity sprint 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 Effect of caffeine ingestion after creatine supplementation on intermittent high-intensity sprint performance.
Author CL Lee,JC Lin,CF Cheng,
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)? The aim of this study was to investigate the effects of acute caffeine ingestion on intermittent high intensity sprint performance after 5 days of creatine loading.
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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) After 5 days of creatine supplementation, participants were asked to consume either 6 mg/kg of caffeine (Sigma–Aldrich, Sydney, Australia) or an equivalent placebo (maltodextrin; Starmax Nutrition, Hereford, UK) 1 h before the IHIS test on the sixth day. Previous studies (Anselme et al. 1992 ; Spriet et al. 1992 ) have proved that this dosage of caffeine ingestion can elicit a positive ergogenic effect without serious side effects.
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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 estimated by the Polar heart rate monitor (Polar S810iTM , Polar Electro Inc, Finland) during the IHIS test, and the 6-20 Borg rating of perceived exertion (RPE) scale was also obtained immediately after every 10-s sprint throughout the IHIS test.
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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.) Control group - subjects conducted exercise using no ergonomic aids.
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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) Throughout the exercise, mean and peak power values were analyzed using two-way ANOVA with repeated measures for conditions (CON, CRE + CAF, and CRE + PLA) and time (sprint number). Plasma lactate, glucose, catecholamine, heart rate, and RPE were analyzed in the same manner. One-way ANOVA with repeated measures was used to compare body mass among the three conditions, and a paired t test was used to analyze physical activity of the 5 days between the CRE + CAF and CRE + PLA conditions. Statistical significance was set at a P value of B 0.05 in all cases. Bonferroni post hoc analysis was used when the interaction was significant.
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What conflicts of interest were reported? "The authors declare that they have no conflict of interest."
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Refid 21207054
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What were the sources of funding? This study was supported by a research grant from National Science Council, Taiwan (NSC 97-2410-H-034-028).
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