Effect of creatine loading on long-term sprint exercise performance and metabolism

Preen, David B.; Dawson, Brian; Goodman, Carmél; Lawrence, Steven; Beilby, John; Ching, Simon

doi:10.1097/00005768-200105000-00022

Cited by 56 publications

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“…Previous studies that have showed benefits of short-term (5-6 days) creatine supplementation have used similar performance protocols (e.g., repetitive or long sprints) as those used in this present study. But in contrast to this study, the other researchers used a typical loading phase (20 g·d Ϫ1 ) (4,5,8,17,20,24). The basic premise behind the use of a 5-to 6-day loading phase is to maximize muscle creatine concentrations in a short period of time (12).…”

Section: Discussionmentioning

confidence: 98%

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Effect of Low-Dose,short-Duration Creatine Supplementation on Anaerobic Exercise Performance

Hoffman

Stout

Falvo

et al. 2005

Journal of Strength and Conditioning Research

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ABSTRACT. Hoffman, J.R., J.R. Stout, M.J. Falvo, J. Kang, and N.A. Ratamess. Effect of low-dose, short-duration creatine supplementation on anaerobic exercise performance. J. Strength Cond. Res. 19(2):260-264. 2005.-To examine the efficacy of a low-dose, short-duration creatine monohydrate supplement, 40 physically active men were randomly assigned to either a placebo or creatine supplementation group (6 g of creatine monohydrate per day). Testing occurred before and at the end of 6 days of supplementation. During each testing session, subjects performed three 15-second Wingate anaerobic power tests. No significant (p Ͼ 0.05) group or time differences were observed in body mass, peak power, mean power, or total work. In addition, no significant (p Ͼ 0.05) differences were observed in peak power, mean power, or total work. However, the change in the rate of fatigue of total work was significantly (p Ͻ 0.05) lower in the creatine supplementation group than in the placebo group, indicating a reduced fatigue rate in subjects supplementing with creatine compared with the placebo. Although the results of this study demonstrated reduced fatigue rates in patients during high-intensity sprint intervals, further research is necessary in examining the efficacy of low-dose, short-term creatine supplementation.

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Section: Discussionmentioning

confidence: 98%

“…) as their supplement regime (4,5,17,20,24). There is only one investigation known that has shown there to be ergogenic benefits of a low-dose creatine supplementation (3).…”

mentioning

confidence: 99%

Effect of Low-Dose,short-Duration Creatine Supplementation on Anaerobic Exercise Performance

Hoffman

Stout

Falvo

et al. 2005

Journal of Strength and Conditioning Research

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“…kg -1 ). Reen et al (23) verificaram Gráfico 1. Potência pico antes (PRÉ) e depois (PÓS) de sete dias de treinamento com e sem suplementação de creatina.…”

Section: Discussionunclassified

Desempenho da potência anaeróbia em atletas de elite do mountain bike submetidos à suplementação aguda com creatina

Molina

Rocco

Fontana

2009

Rev Bras Med Esporte

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RESUMoCom o objetivo de investigar os efeitos da suplementação aguda com creatina no desempenho da potência anaeróbia de atletas de elite do mountain bike, 20 atletas em período básico do macrociclo de treinamento foram distribuídos aleatoriamente (duplo-cego) em dois grupos: placebo (PLA, n = 10) e creatina (CRE, n = 10). Foram avaliados quanto à composição corporal (pesagem hidrostática) e potência anaeróbia (teste de Wingate -TW) antes (PRÉ) e depois (PÓS) de sete dias de suplementação. A creatina ou maltodextrina foi usada em três doses diárias de 0,3g/kg de massa corporal diluídos em meio líquido adoçado. Não foram observadas diferenças significativas nas variáveis morfológicas após sete dias de suplementação (PRÉ x PÓS), e os grupos não diferiram apesar da variação percentual (Δ%) contrária (positiva para o grupo CRE e negativa para o PLA). A potência anaeróbia pico (PP) e o instante da potência pico (IPP) aumentaram e o índice de fadiga diminuiu do PRÉ para o PÓS-testes no grupo CRE, enquanto que o grupo PLA não apresentou diferenças significantes. A PP apresentou forte tendência em ser maior e o IPP foi maior no grupo CRE comparado com o PLA. Conclui-se que existem evidências de que a suplementação com creatina (0,3g/kg) em curto prazo (sete dias) pode retardar o IPP (CRE 3,0 ± 0,5/3,6 ± 0,8 Δ%= 20%) no teste de Wingate em atletas de elite do mountain bike, sugerindo que a suplementação com creatina pode melhorar o desempenho físico quanto à potência anaeróbia durante o trabalho de alta intensidade e curta duração.Palavras-chave: teste de Wingate, pesagem hidrostática, composição corporal. aBStRaCtIn order to investigate the effect of a high dose, acute oral creatine supplementation on anaerobic power of male off-road cyclists, twenty elite athletes training at the basic period were randomly (double-blind) assigned into 2 groups: placebo (PLA n=10) and creatine (CRE n=10). They were submitted to a body composition evaluation (underwater weighting) and Wingate Anaerobic Test (TW) before (PRE) and after (POS) seven days of supplementation. The oral supplements (creatine and maltodextrine) were taken in sweetened vehicle with three equal doses per day (0. 3 g/kg body mass/dose). After a seven-day period, no significant differences were found on morphological variables (PRE x POS) and there was no difference between the groups in spite of the opposite percent variation (Δ%) (positive for CRE and negative for PLA group). The anaerobic power output (PP) and the moment of pick power (IPP) increased and the fatigue index decreased from PRE to POST tests in CRE group; however, the PLA group did not show significant differences. The PP showed strong tendency to increased values and IPP was greater in the CRE compared with the PLA group. The results of the present study indicated that short-term creatine supplementation (0.3g/kg) can postpone the anaerobic IPP (CRE 3.0 ± 0.5/3.6 ± 0.8 Δ%= 20%) leading to significant improvement on the performance of power output and peak power moment in off-road cyclists.Keywords: ...

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“…Durante uma atividade física de alta intensidade, o ADP (difosfato de adenosina) é refosforilado para ATP, utilizando os depó-sitos de fosfato de creatina. A suplementação com creatina pode aumentar tais depósitos em 6-8 vezes, aumentando a disponibilidade de fosfato de creatina para a regeneração do ATP 3,34,35 . Para Nissen & Sharp 23 , existem três mecanismos de ação da creatina na fisiologia do esporte: aumento na força muscular, como resultado do aumento da expressão de miosina de cadeia pesada; ação anticatabólica; e aumento do volume celular, estimulando a síntese proteica.…”

Section: Creatinaunclassified

Dietary supplement use by adolescents

Alves¹,

Lima²

2009

J Pediatr (Rio J)

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Objective: To review the use, benefits and adverse effects of the main dietary supplements consumed by adolescents. Sources:The literature review was performed using MEDLINE and LILACS databases (1997-2008). We analyzed 377 articles, and 52 of them were selected as references. Summary of the findings:Consumption of dietary supplements is widely spread among adolescents. This habit has often been detected in pediatric and adolescent medicine clinics. Most of the time, the use of supplements is motivated by the search of the "ideal body." Other reasons for this practice are: attempt to compensate for an inadequate diet, increase immunity, prevent diseases, improve athletic performance and overcome their own athletic limits. The dietary supplements most frequently used and for which there is little evidence of beneficial effects in healthy adolescents are: proteins, amino acids, beta-hydroxy-betamethylbutyrate, microelements, carnitine, creatine, vitamins, caffeine, and bicarbonate. This dietary supplementation may be beneficial for competitive athletes who do not have a balanced diet after a specific dietary deficiency has been detected. Conclusion:The unrestrained consumption of dietary supplements should be avoided, since, besides the lack of evidence that such practice will lead to improvement of performance, it exposes adolescents to several adverse effects. Balanced nutrition, with intake of essential energy and nutrients is usually enough to achieve good athletic performance. The use of dietary supplements must be allowed only for selected cases in which specific nutritional deficiencies are identified. J Pediatr (Rio J). 2009;85(4):287-294:Dietary supplements, exercise, sports, puberty. ResumoObjetivo: Revisar crititcamente o uso, benefícios e efeitos adversos dos principais suplementos alimentares utilizados por adolescentes. Fontes dos dados:A pesquisa bibliográfica, realizada nos últimos 10 anos, utilizou os bancos de dados MEDLINE e LILACS. Foram examinados 377 artigos, sendo selecionados 52. Síntese dos dados:O consumo de suplementos dietéticos é amplamente difundido entre adolescentes. Tal fato é constatado, com frequência, nos consultórios de pediatria e hebeatria. Na maioria das vezes ele ocorre sem uma necessidade específica, sendo motivado pela busca do corpo ideal. Outros motivos para essa suplementação são: compensar dieta inadequada, aumentar imunidade, prevenir doenças, melhorar o desempenho competitivo e superar os próprios limites. Os suplementos alimentares mais utilizados e discutidos nesse artigo e para os quais existem poucas evidências de um efeito benéfico de sua utilização por adolescentes saudáveis são: proteínas, aminoácidos, betahidroxibetametilbutirato, microelementos, carnitina, creatina, vitaminas, cafeína e bicarbonato.Conclusão: O uso irrestrito de suplementos dietéticos deve ser desaconselhado, uma vez que expõe o adolescente a vários efeitos adversos, além da falta de evidência de que tal prática levará a melhora no desempenho. Uma nutrição balanceada, com aquisição...

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Effect of creatine loading on long-term sprint exercise performance and metabolism

Abstract: The results of this study indicate that Cr ingestion (20 g.day-1 x 5 d) improved exercise performance during 80 min of repeated-sprint exercise, possibly due to an increased TCr store and improved PCr replenishment rate.

Cited by 56 publications

References 0 publications

Effect of Low-Dose,short-Duration Creatine Supplementation on Anaerobic Exercise Performance

Effect of Low-Dose,short-Duration Creatine Supplementation on Anaerobic Exercise Performance

Desempenho da potência anaeróbia em atletas de elite do mountain bike submetidos à suplementação aguda com creatina

Dietary supplement use by adolescents

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