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      Efeito da ingestão de cafeína em diferentes tarefas de tempo de reação Translated title: Effect of caffeine ingestion on different reaction time tasks Translated title: Efecto de la ingesta de cafeína en diferentes tareas de tiempo de reacción

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          Abstract

          O estudo examinou os efeitos da ingestão de cafeína em diferentes tarefas de tempo de reação. Em duas sessões, 22 homens (22,4 ± 2,9 anos; 77,3 ± 5,4 kg) ingeriram placebo ou cafeína (3 mg/kg) 45 minutos antes do teste de tempo de reação simples visual (TRS visual), auditivo (TRS auditivo), audiovisual (TRS audiovisual) e de discriminação sensorial (TR discriminação sensorial). Não foram encontradas diferenças significativas no TRS auditivo e TR de discriminação sensorial, sendo encontradas diferenças significativas apenas no TRS visual (Cafeína: 242,1 ± 25,98 ms vs. Placebo: 254,34 ± 28,29 ms) e TRS audiovisual (Cafeína: 242,55 ± 31,27 ms vs. Placebo: 255,68 ± 30,02 ms). Os resultados comprovam o efeito psicoestimulante causado pelo consumo de cafeína no TRS visual e audiovisual.

          Translated abstract

          The study examined the effects of caffeine ingestion on different reaction time tasks. In two sessions, 22 males (22.4 ± 2.9 years; 77.3 ± 5.4 kg) ingested placebo or caffeine (3 mg/kg) 45 minutes before the test of visual simple reaction time (Visual SRT), auditory (Auditory SRT), auditory-visual (Auditory-visual SRT) and of sensory discrimination (sensory discrimination RT). No significant difference was found in the auditory SRT and of sensory discrimination, significant difference was found only in the visual SRT (Caffeine: 242.1 ± 25.98 ms vs. Placebo: 254.34 ± 28.29 ms) and auditory-visual SRT (Caffeine: 242.55 ± 31,27 ms vs. Placebo: 255.68 ± 30.02 ms). The results confirm the psychostimulant effect caused by the consumption of caffeine on visual and auditory-visual TRS.

          Translated abstract

          El estudio examinó los efectos de la ingestión de cafeína en diferentes tareas de tiempo de reacción. En dos sesiones, 22 hombres (22,4 ± 2,9 años; 77,3 ± 5,4 kg) ingeriran placebo o cafeína (3 mg/kg) 45 minutos antes de la prueba del tiempo de reacción simple visual (TR visual), auditivo (TR auditivo), audio-visual (TR audio-visual) y de la discriminación sensorial (TR discriminación sensorial). No se encontraron diferencias significativas en el TRS auditorio y TR de la discriminación sensorial, se encontraron diferencias significativas sólo en lo TRS visual (Cafeína: 242,1 ± 25,98 ms vs. Placebo: 254,34 ± 28,29 ms) e TRS audio-visual (Cafeína: 242.55 ± 31.27 ms vs. Placebo: 255.68 ± 30.02 ms). Los resultados muestran el efecto psicoestimulante causado por la ingesta de cafeína en TRS visual y audio-visual.

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          Most cited references27

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          Effects of caffeine on human behavior.

          A. Smith (2002)
          The literature suggests that the following effects on behavior of adult humans may occur when individuals consume moderate amounts of caffeine. (1) Caffeine increases alertness and reduces fatigue. This may be especially important in low arousal situations (e.g. working at night). (2) Caffeine improves performance on vigilance tasks and simple tasks that require sustained response. Again, these effects are often clearest when alertness is reduced, although there is evidence that benefits may still occur when the person is unimpaired. (3) Effects on more complex tasks are difficult to assess and probably involve interactions between the caffeine and other variables which increase alertness (e.g. personality and time of day). (4) In contrast to the effects of caffeine consumption, withdrawal of caffeine has few effects on performance. There is often an increase in negative mood following withdrawal of caffeine, but such effects may largely reflect the expectancies of the volunteers and the failure to conduct "blind" studies. (5) Regular caffeine usage appears to be beneficial, with higher users having better mental functioning. (6) Most people are very good at controlling their caffeine consumption to maximise the above positive effects. For example, the pattern of consumption over the day shows that caffeine is often consumed to increase alertness. Indeed, many people do not consume much caffeine later in the day since it is important not to be alert when one goes to sleep. In contrast to effects found from normal caffeine intake, there are reports that have demonstrated negative effects when very large amounts are given or sensitive groups (e.g. patients with anxiety disorders) were studied. In this context caffeine has been shown to increase anxiety and impair sleep. There is also some evidence that fine motor control may be impaired as a function of the increase in anxiety. Overall, the global picture that emerges depends on whether one focuses on effects that are likely to be present when caffeine is consumed in moderation by the majority of the population or on the effects found in extreme conditions. The evidence clearly shows that levels of caffeine consumed by most people have largely positive effects on behavior. Excessive consumption can lead to problems, especially in sensitive individuals.
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            Effects of low doses of caffeine on cognitive performance, mood and thirst in low and higher caffeine consumers.

            Caffeine is present in many widely consumed drinks and some foods. In the fairly extensive literature on the psychostimulant effects of caffeine, there are few dose-response studies and even fewer studies of the effects of doses of caffeine lower than 50 mg (the range of the amounts of caffeine contained in, for example, a typical serving of tea or cola). This study measured the effects of 0, 12.5, 25, 50 and 100 mg caffeine on cognitive performance, mood and thirst in adults with low and moderate to high habitual caffeine intakes. This was a double-blind, within-subjects study. Following overnight caffeine abstinence, participants (n=23) completed a test battery once before and three times after placebo or caffeine administration. The test battery consisted of two performance tests, a long duration simple reaction time task and a rapid visual information processing task, and a mood questionnaire (including also an item on thirst). Effects on performance and mood confirmed a psychostimulant action of caffeine. All doses of caffeine significantly affected cognitive performance, and the dose-response relationships for these effects were rather flat. The effects on performance were more marked in individuals with a higher level of habitual caffeine intake, whereas caffeine increased thirst only in low caffeine consumers. After overnight caffeine abstinence, caffeine can significantly affect cognitive performance, mood and thirst at doses within and even lower than the range of amounts of caffeine contained in a single serving of popular caffeine-containing drinks. Regular caffeine consumers appear to show substantial tolerance to the thirst-increasing but not to the performance and mood effects of caffeine.
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              The impact of caffeine on mood, cognitive function, performance and hydration: a review of benefits and risks

              C. Ruxton (2008)
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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Role: ND
                Journal
                rbce
                Revista Brasileira de Ciências do Esporte
                Rev. Bras. Ciênc. Esporte
                Colégio Brasileiro de Ciências do Esporte (Porto Alegre )
                2179-3255
                June 2012
                : 34
                : 2
                : 465-476
                Affiliations
                [1 ] Universidade do Estado de Santa Catarina Brazil
                [2 ] Universidade do Estado de Santa Catarina Brazil
                [3 ] Universidade do Estado de Santa Catarina Brazil
                [4 ] Universidade do Estado de Santa Catarina Brazil
                [5 ] Universidade do Estado de Santa Catarina Brazil
                Article
                S0101-32892012000200015
                10.1590/S0101-32892012000200015
                8ebf8521-2a58-41e3-9e01-1830030efece

                http://creativecommons.org/licenses/by/4.0/

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                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=0101-3289&lng=en
                Categories
                SPORT SCIENCES

                Sports medicine
                Caffeine,reaction time,psychomotor performance,Psychostimulant,Cafeína,tiempo de reacción,desempeño psicomotor,Psicoestimulante,tempo de reação,desempenho psicomotor

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