Little effect of caffeine ingestion on repeated sprints in team-sport athletes

Paton, Carl D.; Hopkins, William G.; Vollebregt, Lisa

doi:10.1097/00005768-200105000-00023

Cited by 93 publications

(70 citation statements)

References 8 publications

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“…Indeed the bulk of current evidence suggests that caffeine ingestion enhances performance to quite a marked extent during more prolonged endurance exercise (40), although there appears to be little if any effect during high intensity exercise of short duration (10,14,18,34), a fact which seems to have escaped the attention of the international doping control authorities.…”

Section: Discussionmentioning

confidence: 99%

“…More recently, there has been a considerable increase in evidence (48) supporting a substantial ergogenic effect of caffeine on endurance but not sprint activities (10,15,18,34). The vast majority of those studies showing an ergogenic effect of caffeine on endurance exercise have evaluated performance during open-ended cycling (1,2,17,22,33) or running (10,14) trials in which subjects maintain the same exercise intensity for as long as possible.…”

Section: Introductionmentioning

confidence: 99%

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Caffeine Ingestion Does Not Alter Performance during a 100-km Cycling Time-Trial Performance

Hunter¹,

St²,

Gibson³

et al. 2002

International Journal of Sport Nutrition and Exercise Metabolism

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This study analyzed the effect of caffeine ingestion on performance during a repeated-measures, 100-km, laboratory cycling time trial that included bouts of 1-and 4-km high intensity epochs (HIE). Eight highly trained cyclists participated in 3 separate trials-placebo ingestion before exercise with a placebo carbohydrate solution and placebo tablets during exercise (Pl), or placebo ingestion before exercise with a 7% carbohydrate drink and placebo tablets during exercise (Cho), or caffeine tablet ingestion before and during exercise with 7% carbohydrate (Caf). Placebo (twice) or 6 mg · kg -1 caffeine was ingested 60 min prior to starting 1 of the 3 cycling trials, during which subjects ingested either additional placebos or a caffeine maintenance dose of 0.33 mg · kg -1 every 15 min to trial completion. The 100-km time trial consisted of five 1-km HIE after 10, 32, 52, 72, and 99 km, as well as four 4-km HIE after 20, 40, 60, and 80 km. Subjects were instructed to complete the time trial and all HIE as fast as possible. Plasma (caffeine) was significantly higher during Caf (0.43 ± 0.56 and 1.11 ± 1.78 mM pre vs. post Pl; and 47.32 ± 12.01 and 72.43 ± 29.08 mM pre vs. post Caf). Average power, HIE time to completion, and 100-km time to completion were not different between trials. Mean heart rates during both the 1-km HIE (184.0 ± 9.8 Caf; 177.0 ± 5.8 Pl; 177.4 ± 8.9 Cho) and 4-km HIE (181.7 ± 5.7 Caf; 174.3 ± 7.2 Pl; 175.6 ± 7.6 Cho; p < .05) was higher in Caf than in the other groups. No significant differences were found between groups for either EMG amplitude (IEMG) or mean power frequency spectrum (MPFS). IEMG activity and performance were not different between groups but were both higher in the 1-km HIE, indicating the absence of peripheral fatigue and the presence of a centrally-regulated pacing strategy that is not altered by caffeine ingestion. Caffeine may be without ergogenic benefit during endurance exercise in which the athlete begins exercise with a defined, predetermined goal measured as speed or distance.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Caffeine Ingestion Does Not Alter Performance during a 100-km Cycling Time-Trial Performance

Hunter¹,

St²,

Gibson³

et al. 2002

International Journal of Sport Nutrition and Exercise Metabolism

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“…However, it remains of questionable benefit to sports involving strength and power, such as sprinting ([10] [11]). Although caffeine is effective in overcoming 'sleepiness' as reflected in monotonous and unstimulating performance measures, such as the psychomotor performance test (PVT - [7] [12] [13] [14] [7]), little is known about whether caffeine is effective in counteracting putative sleep loss effects on high level cognitive performance in psychomotor skills involving judgement and accuracy rather than speed, as in tennis serves, for example.…”

Section: Introductionmentioning

confidence: 99%

Sleep restriction and serving accuracy in performance tennis players, and effects of caffeine

Reyner

Horne

2013

Physiology & Behavior

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Citation: REYNER, L.A. and HORNE, J.A., 2013. Sleep restriction and serving accuracy in performance tennis players, and effects of caffeine. Physiology and Behavior, 120, Additional Information:• This is the author's version of a work that was accepted for publication in Physiology and Behavior.In its present form it has the fol- both studies comprised 40 serves into a (1.8m x 1.1m) 'service box' diagonally, over the net.Study 2 was identical to that of Study 1, except that there was an extra sleep restriction condition.All conditions involved a sugar free drink given 30 min before testing, but with the drink for one sleep restriction containing 80mg caffeine (double blind). Study 1 comprised 16 men and women, in a within Ss counterbalanced design (normal versus sleep restriction). Study 2 involved 12 different men and women undergoing three conditions in a latin square design.Conditions were as for Study 1, with a replicated sleep restriction. All conditions incorporated a sugar-free drink given 30 min before testing, with one restriction including 80mg caffeine (double blind). Both studies showed significant impairments to serving accuracy following sleep restriction, particularly with women. At this dose, caffeine had no beneficial effect. These results reflect laboratory based, non-sports related findings pointing to detrimental effects of sleep loss on executive function. 211

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“…Da mesma forma, estudo não observou mudanças significativas na performance de atletas em protocolo de sprints repetidos, realizados após ingestão de 6 mg/Kg de cafeína. 11 Fato semelhante foi encontrado em um estudo prospectivo, randomizado, realizado com 43 indivíduos, submetidos à suplementação de cafeína e a uma mistura de outros suplementos (creatina, betaína e um extrato de dendrobium), durante 06 semanas. Os resultados demonstraram que não houve melhorias no desempenho e na composição corporal; contudo, houve melhoria significativa na sensação subjetiva de esforço (p<0,024) e na concentração (p<0,041), gerando níveis mais elevados de foco no exercício.…”

Section: Discussionunclassified

Efeitos da cafeína na performance de exercícios de endurance

et al. 2015

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RESUMOObjetivo: verificar os efeitos da cafeína na performance de exercícios de endurance, através do teste de exaustão na bicicleta ergométrica. Método: participaram 50 indivíduos do sexo masculino, submetidos ao teste de exaustão em cicloergômetro após ingestão de 6mg/kg de cafeína (CAF) (n=25; grupo cafeína), e 6mg/ kg de placebo (PLA) (n=25; grupo placebo), 40 minutos antes do teste. Os dados foram tratados estatisticamente, submetidos ao teste t de Student (p<0,05 INTRODUÇÃOA fadiga tem sido apontada como fator limitante do desempenho atlético e sua origem depende da duração do exercício, intensidade, tipo de fibras que estão sendo recrutadas na ação muscular, 1 que são (I, IIa, IIb, Iiab), 2 e do grau de aptidão individual, 3 podendo ocorrer em locais diferenciados e também no decorrer do trajeto entre o sistema nervoso central e a musculatura contráctil utilizada, e portanto, pode ser dividida em central e periférica. 4 A fadiga pode ser desencadeada por várias situações, sendo: suprimento energético; acoplamento excitação-contração; via excitatória para motoneurô-mios; excitabilidade dos motoneurônios; aferência excitatória para centros motores superiores; transmissão neuro-muscular; excitabilidade do sarcolema e acúmulo de metabólitos. 5Fadiga central, é ocasionada quando cognições e ações que necessitam de um aumento de performance ou esforço; é interrompida sem evidências de redução dos fatores motores periféricos.6 O sistema nervoso central acomete a fadiga se houver uma redução da frequência de disparos e quantidade de unidades motoras excitadas.5 Fadiga periférica diz respeito a falhas do sistema neuromuscular na periferia, em que eventos mecânicos, neurais e energéticos comprometeriam a

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Little effect of caffeine ingestion on repeated sprints in team-sport athletes

Cited by 93 publications

References 8 publications

Caffeine Ingestion Does Not Alter Performance during a 100-km Cycling Time-Trial Performance

Caffeine Ingestion Does Not Alter Performance during a 100-km Cycling Time-Trial Performance

Sleep restriction and serving accuracy in performance tennis players, and effects of caffeine

Efeitos da cafeína na performance de exercícios de endurance

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