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The Metabolic And Performance Effects Of Coffeine

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Science
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ashford university
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The Metabolic and Performance Effects of Caffeine Compared to Coffee during Endurance
Exercise
Monday, March 29, 2021
1
1) Identify the research question and rationale posed by the article.
Few questions were suggested in the article, but the one that includes the main purpose of it is: Does coffee
cause differences in the performance and metabolism effects during exercises when compared to caffeine
alone?
This question summarizes the whole story done by the researchers at the Birmingham University, where the
article experiments that were done focused on showing the differences that may be caused by coffee compared
to caffeine alone on the metabolism and the performance effects during any incremental exercise. Researchers
used the word ergogenic; which means a substance that can be used to enhance or improve human’s exercises
and performance, and this word was used on behalf of the effects that may coffee affect during exercises
comparing it to caffeine for the same purpose.
The rationale includes the following causes:
1. Few studies showed a positive effect of coffee on exercise performance.
2. Some investigations showed that coffee has an ergogenic effect.
3. Chlorogenic acids may have antagonized the physiological responses of caffeine.
4. The consumption of chlorogenic acids varies significantly in coffee ranging from 20675 mg per
serving.
5. Chlorogenic acids, found in coffee, will have on the physiological and metabolic effects of coffee and
caffeine during exercise in humans.
6. Investigate whether acute intake of coffee and anhydrous caffeine is ergogenic to cycling performance
compared to decaffeinated coffee or placebo beverages when using a validated 45-minute time trial
performance test.
The listed causes in the rationale define the main points and the purpose behind this article, and specifically,
showing the effects of coffee and caffeine ingestion to examine whether they improve prolonged endurance
exercise performance, and compare that with the ingestion of the decaffeinated coffee or placebo.
2) Provide a hypothesis and null hypothesis that applies to the question (and papers
associated)
Hypothesis: If a male cyclist consumed instant coffee, drinks that contain caffeine, decaffeinated coffee, or
placebo before exercises, then the cyclist’s endurance exercise performance might be improved.
The above hypothesis concludes the purpose for examining the effects of caffeine, especially by focusing on
coffee and studying its chlorogenic acid substance that may affect positively the endurance exercise
performance.

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The Metabolic and Performance Effects of Caffeine Compared to Coffee during Endurance
Exercise
Monday, March 29, 2021
2
Null Hypothesis: Coffee and caffeine might have the same endurance exercise performance effects when they
are consumed before any incremental exercise.
This hypothesis included the overall purpose of this article which results will show that coffee and caffeine have
similar effects in enhancing athletes’ performance when it is consumed before exercises. The results were
documented according to the data obtained after certain experimental studies done by researchers at the
Birmingham University.
3) Discuss the scientific rigor of the articles associated with your question (i.e. critically
analyze and compare and contrast the articles)
Researchers at Birmingham University used to study the effects of coffee and caffeine using a time trial
performance test and also by investigating the metabolic effects of both of them. For this reason, cyclists were
trained to take the test by first undergoing the preliminary trial. In this trial, participants visited the Human
Performance Laboratory at the University of Birmingham on two separate occasions separated by 7 days.
Participants first had weight and height recorded and started the test at 95 W for 3 minutes and the resistance
was increased every 3 minutes in incremental steps of 35 W until they reached exhaustion. After that, the
maximum power W
max
was recorded according to this rule W
max
= W
out
+ [(t/180) x 35], where W
out
is the power
output of the last stage completed during the test, and t is the time spent, in seconds, in the final stage. Add to
that, the respiratory gas measurement VO2 and VCO2 were collected continuously using an Online Gas
Analyzer. Also, heart rate (HR) was recorded during each stage of the test using an HR monitor. Seven days
after the first stage, participants reported back to the lab, for the second preliminary trial. The purpose of the
trial was to familiarize each subject with the experimental trial and time trial protocol. All participants
completed 30 minutes of steady-state (SS) at 50% Wmax). Besides, expired breath samples were collected
every 10-min for measures of VO2, VCO2, and RER (Respiratory Exchange Ratio). Immediately following all
participants completed a time trial lasting 45 min. The data collected during the familiarization trial was not
used for any of the final analyses. On the other hand, and during the experimental study that consists of 4
experiments, all participants reposted to the laboratory, participants consumed treatment beverages and rested
for 1 hour and then they were invited for recording their heart rate, VO2, VCO2, and other data recommended
during the study. In the treatment stage, participants who were cyclists were ingested 1 of 4 treatment
beverages. The beverages included caffeine regular coffee, decaffeinated coffee, and placebo to act as controls
to both of the caffeinated trials. To start with the coffee which was prepared using instant coffee, participants
consumed the instant coffee before the exercise which was 15 g coffee per kilogram, where it was dissolved in
600ml hot water and delivered in a mug. While the decaffeinated coffee (DECAF) which includes less than
97% caffeine was provided minimal caffeine out of the previously prepared beverages. After participants
consumed their beverages separately, and of course by recording certain measurements that are required in the
study. The calculations were measured during the steady-state, and the main analysis was blood, plasma
caffeine and chlorogenic acid, and statistical analysis. In the blood analysis, blood samples were taken
throughout each experimental trial to analyze the presence of plasma glucose, the Plasma Caffeine and
Chlorogenic Acid analysis that detects the rate of presence of caffeine, and the statistical analysis that analyzes
data as well as the time trial performance during each trial. The results obtained showed that both coffee and
caffeine have similar effects and were able to improve exercise performance, while decaffeinated showed
approximately slight effects in the same regard. This result matches the null hypothesis regarding the similar

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The Metabolic and Performance Effects of Caffeine Compared to Coffee during Endurance Exercise Monday, March 29, 2021 1) Identify the research question and rationale posed by the article. Few questions were suggested in the article, but the one that includes the main purpose of it is: