Effect of acute consumption of caffeine on aerobic capacity during step test
Introduction
Caffeine is a central nervous system stimulant which can suppress the effect of adenosine on adenosine receptors and consequently reduced the drowsiness induced by adenosine.(Nehlig et al., 1992) Caffeine in beverages including coffee, tea, and energy drink has become the most commonly used psychoactive substance with researches shown that 87% of US population consume caffeine.(Frary et al., 2005) The worldwide popularity of caffeine causes concerns in its safety, thus it is important to understand its effects on metabolism. This report focuses on the ergogenic effect of caffeine on aerobic metabolism. Aerobic capacity (VO2 max) measures the maximal oxygen consumption during incremental exercise. It describes the ability of the cardiorespiratory system in distributing oxygen to muscles. Thus, VO2 max acts as a quantitative reflection of
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This was expected as the increasing demand for energy during exercise would increase oxygen uptake, thus increases heart rate regardless of whether caffeine was consumed. (Duncker and Bache, 2008) Across the groups, DECAF had a higher mean than CAF for all of the three measurements of pre-treatment, post-treatment and post-exercise pulse rates. This difference might be due to the initial differences in resting pulse rates and health conditions in different individuals as subjects in DECAF had a higher resting pulse rate before the treatment. The differences in mean pulse rates between CAF and DECAF for the three measurements were statistically insignificant as indicated by p-value > 0.05 (table 1 in Appendix). This indicated that acute caffeine consumption had no effect on pulse rate and did not increase heart rate or VO2 max. The experimental result rejected the
Planaria are commonly known as flatworms. These flatworms have sensory organs which allow them to detect light using eyespots (Planaria,2017). The eyespots contain receptors that are highly sensitive to light stimuli causing planaria to prefer darkness. Planaria do not have lungs nor gills. Oxygen enters their bodies through membrane diffusion. Although planaria are just worms, their body react very similar to that of humans when injected with certain drugs or stimulants. One overused and highly popular stimulant is caffeine. Caffeine is known to increase individual’s energy and physical activity which makes them more alert of the surroundings. This observation leads to the question of how different concentrations of caffeine would affect planaria’s
In human studies, caffeine and nicotine have been reported to increase the heart rate of human beings (2).
Caffeine is produced by plants as an insecticide. It is a drug that acts as a stimulant in humans and causes a raised heart rate, and is used to give more energy in drinks such as tea and coffee, add flavour to drinks such as coke, and in weight-loss foods. A raised heart rate increases the risk of cardiovascular disease as it makes the heart work faster which can wear it out. High levels of caffeine have been linked to increased stress and insomnia, which is also linked to heart disease as it raises blood pressure.
The objective of this experiment was to perform extraction. This is a separation and purification technique, based on different solubility of compounds in immiscible solvent mixtures. Extraction is conducted by shaking the solution with the solvent, until two layers are formed. One layer can then be separated from the other. If the separation does not happen in one try, multiple attempts may be needed.
Coffee lab environment: The theme of the coffee bar is more like an island, which allows customers to walk around and interact directly and indirectly with baristas. The interactive which also allows customers to express their thoughts, needs, and expressions about the coffee lab. This can bring up to an improvement of the overall coffee lab. It creates inviting environment for its
Caffeine, a central nervous system stimulant, is the main psychoactive ingredient in energy drinks, which enhances alertness and mood, and counteracts symptoms of sleep. There is no doubt ...
9. Zaharieva, D. P., & Riddell, M. C. (2013). Caffeine and glucose homeostasis during rest and exercise in diabetes mellitus. Applied Physiology, Nutrition & Metabolism, 38(8), 813-822.
Per the hypothesis, most of the results in the lab are in accordance with the expected results. It was expected that the subjects drinking caffeine, diet caffeine free soda, and 16 ml/Kg of water would have a higher rate of production than the control group drinking 7.5 ml/Kg of water due to less water being reabsorbed. Results showed an increase in rate of production, most notably in subjects drinking diet caffeine free soda but seemed to decrease towards the end. For the rest of the subjects, the data shows a gradual rise over time with every subject (besides caffeine free) having a higher rate of production than the control group. The subjects drinking caffeine free soda were the only ones to record a lower rate of production than the control group. This could be due to an increase in glucose reabsorption causing water to follow back into the blood stream. The lack of caffeine does not hinder ADH secretion, which will cause an increased permeability to water in the collecting
Graham, TE. (1998) Effects of Caffeine on Metabolism, Exercise Endurance and Catecholamine Responses and Withdrawl. London
Does one drink caffeine? Caffeine is everywhere, it's in everything, it's apart of our daily lives. That’s what people doesn’t realizes; every soda drink, every cup of coffee, and every energy drink he or she gulps down before a thrilling game, all of that is caffeine. Caffeine is only completed when he or she get addicted. Caffeine can be an exceptional threat to the human body; energy drinks for example, it has enough caffeine to kill someone if he or she drinks enough. Energy drinks has been the number one drink high school students drink to stay awake in school; they even bring the drink in classrooms, and more than one energy drink. Soda has enough caffeine to destroy ones inner body. Soda is a everyday drink for some individuals, they
Two similar, but separate studies were conducted. The first study (A) used 12 highly trained athletes, either triathletes or cyclists. The second study (B) used a smaller sample of 8 athletes with similar backgrounds. While training histories were similar, caffeine intake histories varied from occasional to regular intake of up to ~150 mg/day (2mg/Kg). Subjects first performed a maximal incremental power test to determine their VO2 peak, a measurement of the body's ability to taken in O2 and turn it into work. A work rate of ...
The medication of paracetamol can be administered in various ways and they are sold in different formulations. The common dosage comes in tablets form of 500 mg, in dispersible fizzy tablets (500 mg) and oral suspensions. It can also be bought in capsules as a mixture with other API like caffeine and codeine.
Caffeine acts much like stress, increasing heart rate, blood pressure and levels of stress hormones, Caffeine consumption can double your blood levels of the stress hormones cortisol and epinephrine causing
As the vast majority of Americans are addicted to caffeine, studies show that the effects during post-consumption, can be positive or negative depending on the amount and frequency of caffeine intake. As the demand for caffeine has increased, the caffeine industry has increased its amount of marketing and establishments to help aid this demand. Caffeine addiction can lead to serious health and physiological detriments. It is evident that the primary reason for consumption of caffeinated beverages is due to positive effects, such as alertness. The media has an abundance of marketing to continue to illustrate this main effect.
When a person drinks coffee, the caffeine is absorbed into the bloodstream and then travels to the brain where it blocks an inhibitory neurotransmitter called Adenosine. When this happens, the amount of other neurotransmitters actually increases.