![]() Through this process, the final sample consisted of eight articles, as shown in Table 1. However, from this total, animal studies and studies that did not refer to the central nervous system, effects on the organism, performance, memory, blood pressure and ergogenic potential were excluded. After the search with the descriptors in the databases, a total of 28 articles were found in the Portuguese language. The descriptors used allowed the collection of scientific articles used in the review. We included the studies published between the years 2000 to 2018, which explicitly contemplate the evaluated aspects. ![]() In order to select the studies, an online survey of articles published in the Scientific Electronic Library Online (SciELO), Medical Literature Analysis and Retrieval System Online (MEDLINE) and Latin American and Caribbean Literature in Health Sciences (LILACS), using the descriptors “caffeine”, “effects of caffeine” and “methylxanthine”. Systematic reviews are considered secondary studies, which have in their primary studies their data source.Īccording to Muñoz (2002), the systematic review is a method that has been increasingly used in scientific research for the evaluation of a data set simultaneously, given the ability to integrate the findings of existing individual research, allowing, in an objective way, the synthesis of scientific information. They are also distinguished from integrative reviews, in which different designs are used in the same research, in addition to expressing the author’s own opinion. These are broad and provide general information on the subject in question. Galvão and Pereira (2014) understand that systematic reviews differ from narrative or traditional revisions. This is a systematic review of the literature, in order to search for articles in the literature, to analyze and identify the main effects of caffeine on the body. Due to the diversity of products containing caffeine, it is, without a doubt, the most popular psychoactive drug in the world.Ĭonsidering that caffeine is present in coffee, tea, chocolates, caffeine-based soft drinks or medicines, it can be said that in general the population makes use of this substance daily, although it is very difficult to quantify its consumption. In addition to coffee, caffeine is also found in other drinks, in smaller proportions, such as those containing cocoa, cola and chocolate in addition to tea and some analgesic or cold remedies. Xanthines are substances capable of stimulating the nervous system, producing a certain alertness of short duration. This substance belongs to the group of compounds of methylxanthines, which also includes tea. ![]() Therefore, it is the active ingredient in coffee, but it can be present in many foods and beverages. Despite the increased use of caffeine in recent times, many people have little knowledge of the general effects it has on their bodies.Ĭaffeine, a xanthine alkaloid, was first identified in coffee. There are several plants that contain the substance that was grown or harvested, but today caffeine is added to many foods. Caffeine has been used as a drug for thousands of years. The central nervous system does not appear to develop a great tolerance to the effects of caffeine, although the symptoms of dependence and withdrawal are reported.Ĭoffee is the most consumed beverage in the world. In general, caffeine has effects on anxiety and sleep that vary according to individual sensitivity to methylxanthine. In order to select th e studies, an online survey of articles has been conducted on sites such as the Scientific Electronic Library Online (SciELO), Medical Literature Analysis and Retrieval System Online (MEDLINE) and Latin American and Caribbean Literature in Health Sciences (LILACS), using the descriptors “caffeine”, “effects of caffeine” and “methylxanthine”. This is a literature review study addressing the main effects of caffeine on the body. In this sense, this study aimed to identify the main effects of caffeine on the body. Many of the warning effects of caffeine may be related to the action of methylxanthine on serotonin neurons. Caffeine ac-tivates norepinephrine neurons and appears to affect the local release of dopamine. Caffeine is known to in-crease energetic metabolism throughout the brain, but it also decreases cerebral blood flow, inducing relative cerebral hypoperfusion. Caffeine is the most widely consumed stimulant.
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