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      Efeito de oito semanas de suplementação com creatina monoidratada sobre o trabalho total relativo em esforços intermitentes máximos no cicloergômetro de homens treinados Translated title: Effect of eight weeks of creatine supplementation on relative total work in intermittent maximal efforts in the cycle ergometer of trained men

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          Abstract

          Este estudo investigou o efeito de um longo período de suplementação com creatina monoidratada (Cr m) sobre o trabalho total relativo (TTR) em esforços intermitentes máximos no cicloergômetro de homens treinados. Vinte seis indivíduos foram divididos aleatoriamente em grupo creatina (CR, n=13) e grupo placebo (PL, n=13). Os sujeitos receberam em sistema duplo-cego, doses de Cr m ou placebo-maltodextrina (20 g.d-1 por 5 dias e 3 g.d-1 durante 51 dias subseqüentes). Os grupos tiveram seus hábitos alimentares e sua condição física previamente controlados. Para determinação do TTR os sujeitos foram submetidos a protocolo de exercício em cicloergômetro composto de três Testes de Wingate de 30s separados por dois minutos recuperação, antes e após o período de suplementação. ANOVA, seguido pelo teste post hoc de Tukey, quando p<0,05, foi usado para tratamento dos dados. Observou-se efeito significante do tempo para o TTR (F1,24=8,00; p<0,05), com o grupo Cr apresentando aumento significante na produção de TTR comparado ao grupo PL após o período de suplementação (690,54 ± 46,83 vs 655,71 ± 74,34 J.kg-1 respectivamente; p<0,05). Os resultados do presente estudo sugerem que a suplementação de Cr m melhora o desempenho físico em esforços repetidos de alta intensidade e curta duração.

          Translated abstract

          This study investigated the effect of long-term supplementation with creatine monohydrate (Cr m) on relative total work (RTW) in intermittent maximal efforts in the cycle ergometer of trained men. Twenty six individuals were randomly divided in creatine group (CR, n=13) and placebo group (PL, n=13). The subjects received in a double-blind manner, doses of Cr m or placebo-maltodextrin (20 g.d-1 for 5 days and 3 g.d-1 for 51 subsequent days). The groups had their alimentary habits and physical fitness controlled previously. For determination of the RTW the subjects were submitted to exercise protocol in cycle ergometer comprised three 30s Anaerobic Wingate Test interspersed with two minutes recovery, before and after the supplementation period. ANOVA, followed by the Tukey post hoc test, when p<0.05, were used for data treatment. There was a significant time effect for RTW (F1,24=8.00; p<0.05), with the CR group demonstrating significant greater (3%) on the RTW production compared to PL group after the supplementation period (690.54 ± 46.83 vs 655.71 ± 74.34 J.kg-1 respectively; p<0.05). The results of the present study suggest that Cr m supplementation improve the performance in repeated efforts of high intensity and short duration.

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          Most cited references41

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          The Wingate anaerobic test. An update on methodology, reliability and validity.

          O. Bar-Or (1987)
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            Elevation of creatine in resting and exercised muscle of normal subjects by creatine supplementation

            1. The present study was undertaken to test whether creatine given as a supplement to normal subjects was absorbed, and if continued resulted in an increase in the total creatine pool in muscle. An additional effect of exercise upon uptake into muscle was also investigated. 2. Low doses (1 g of creatine monohydrate or less in water) produced only a modest rise in the plasma creatine concentration, whereas 5 g resulted in a mean peak after 1 h of 795 (sd 104) μmol/l in three subjects weighing 76–87 kg. Repeated dosing with 5 g every 2 h sustained the plasma concentration at around 1000 μmol/l. A single 5 g dose corresponds to the creatine content of 1.1 kg of fresh, uncooked steak. 3. Supplementation with 5 g of creatine monohydrate, four or six times a day for 2 or more days resulted in a significant increase in the total creatine content of the quadriceps femoris muscle measured in 17 subjects. This was greatest in subjects with a low initial total creatine content and the effect was to raise the content in these subjects closer to the upper limit of the normal range. In some the increase was as much as 50%. 4. Uptake into muscle was greatest during the first 2 days of supplementation accounting for 32% of the dose administered in three subjects receiving 6 × 5 g of creatine monohydrate/day. In these subjects renal excretion was 40, 61 and 68% of the creatine dose over the first 3 days. Approximately 20% or more of the creatine taken up was measured as phosphocreatine. No changes were apparent in the muscle ATP content. 5. No side effects of creatine supplementation were noted. 6. One hour of hard exercise per day using one leg augmented the increase in the total creatine content of the exercised leg, but had no effect in the collateral. In these subjects the mean total creatine content increased from 118.1 (sd 3.0) mmol/kg dry muscle before supplementation to 148.5 (sd 5.2) in the control leg, and to 162.2 (sd 12.5) in the exercised leg. Supplementation and exercise resulted in a total creatine content in one subject of 182.8 mmol/kg dry muscle, of which 112.0 mmol/kg dry muscle was in the form of phosphocreatine.
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              Muscle creatine loading in men.

              The effect of dietary creatine and supplementation on skeletal muscle creatine accumulation and subsequent degradation and on urinary creatinine excretion was investigated in 31 male subjects who ingested creatine in different quantities over varying time periods. Muscle total creatine concentration increased by approximately 20% after 6 days of creatine supplementation at a rate of 20 g/day. This elevated concentration was maintained when supplementation was continued at a rate of 2 g/day for a further 30 days. In the absence of 2 g/day supplementation, total creatine concentration gradually declined, such that 30 days after the cessation of supplementation the concentration was no different from the presupplementation value. During this period, urinary creatinine excretion was correspondingly increased. A similar, but more gradual, 20% increase in muscle total creatine concentration was observed over a period of 28 days when supplementation was undertaken at a rate of 3 g/day. In conclusion, a rapid way to "creatine load" human skeletal muscle is to ingest 20 g of creatine for 6 days. This elevated tissue concentration can then be maintained by ingestion of 2 g/day thereafter. The ingestion of 3 g creatine/day is in the long term likely to be as effective at raising tissue levels as this higher dose.
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                Author and article information

                Journal
                rbcf
                Revista Brasileira de Ciências Farmacêuticas
                Rev. Bras. Cienc. Farm.
                Divisão de Biblioteca e Documentação do Conjunto das Químicas da Universidade de São Paulo (São Paulo, SP, Brazil )
                1516-9332
                June 2006
                : 42
                : 2
                : 237-238
                Affiliations
                [01] orgnameUniversidade Estadual de Londrina orgdiv1Centro de Educação Física e Desportos
                [02] orgnameUniversidade de Campinas orgdiv1Faculdade de Educação Física orgdiv2Departamento de Ciência do Esporte
                [03] orgnameUniversidade de São Paulo orgdiv1Faculdade de Ciências Farmacêuticas orgdiv2IIIDepartamento de Alimentos e Nutrição Experimental
                Article
                S1516-93322006000200008 S1516-9332(06)04200208
                1f8bbd01-fa3a-462f-b69a-16468911ac7d

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 16 March 2006
                : 29 September 2005
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 42, Pages: 2
                Product

                SciELO Brazil

                Categories
                Trabalhos Originais

                Fatigue,Anaerobic Performance,Wingate Test,Creatina,Supplementation,Creatine,Fadiga,Teste de Wingate,Desempenho Físico Anaeróbio,Suplementação

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