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Study Title and Description

Effect of coffee ingestion on physiological responses and ratings of perceived exertion during submaximal endurance exercise.



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 coffee ingestion on physiological responses and ratings of perceived exertion during submaximal endurance exercise.
Author S Demura,T Yamada,N Terasawa,
Country
Year 2007
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 coffee ingestion on physiological responses and ratings of perceived exertion during submaximal endurance exercises by 10 healthy young adults.
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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: Participants were 10 healthy male young adults with no history of smoking. Experimental design: The experimental design was a cross-over method. Participants performed a submaximal endurance exercise test for each condition: decaffeinated coffee ingestion and caffeinated coffee with 6 mg caffeine per body mass of each participant was administered as in a previous study. The mean caffeine amount corresponded to about four or five cups of coffee (200 ml/cup, 100 mg of caffeine/200 ml of coffee). With consideration of the experimental order effect, the ingestion was set randomly, and measurements for each condition were performed with a 1-wk. interval. The participants were instructed to fast for at least two hours before starting exercise to avoid a nutritional unbalance with eating and drinking. In addition, both measurements were conducted during the morning, and participants were instructed not to eat past 21:00 of the previous day or to eat food or consume drinks that contained caffeine during the experimental period. Experimental procedure: In the experimental protocol, each participant performed the experimental protocol after a week of V02 max measurements. Participants entered the laboratory and drank either the decaffeinated or caffeinated beverage. They performed submaximal endurance exercises with 60% of VO2max for 60 min., following nonloaded pedaling (0 watt) for 3 min. and 60 min. after decaffeinated or caffeinated beverage ingestion. Oxygen consumption, respiratory exchange ratio, and heart rate were monitored during a rest in a sitting position 30 min. before starting measurement. After they were confirmed to be in a steady state, measurement of the rest state was conducted for 1 min. Heart rate was recorded before exercise and every 1 min. upon starting the exercise.
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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 and electrocardiograms during exercise (ML-1200; Fukuda, Tokyo, Japan) were continuously measured.
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Caffeine (general) Caffeine (general)
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Coffee, Chocolate, energy drink, gum, medicine/supplement, soda, tea, other? Coffee
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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.) Subjects served as their own controls. They received decaffeinated coffee as control.
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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) Two-way repeated measures of analyses of variance (condition x measurement time) were used to test mean differences in physiological responses and RPE between conditions. When a significant main or interaction effect was found, a Tukey honestly significant difference as post hoc analysis was used to examine specific mean differences. An alpha level of .05 was used for all tests.
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What conflicts of interest were reported? Conflict of interest information not discussed.
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Refid 18380106
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What were the sources of funding? Funding information not discussed.
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Results & Comparisons

No Results found.