Caffeine, maximal power output and fatigue.

Williams, Jon L.; Signorile, Joseph F.; Barnes, William S.; Henrich, Timothy

doi:10.1136/bjsm.22.4.132

Cited by 54 publications

(57 citation statements)

References 16 publications

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“…By comparison, this study tested the isometric endurance of subjects aged Ն70 yr, generating a constant force corresponding to 50% of their maximal arm flexion strength. Similar to findings in studies of younger persons (19,43), caffeine had no effect on maximal voluntary strength. The reported effect of caffeine on psychomotor function is somewhat conflicting (21,24,35), but, in this study, there was no indication that caffeine improved either reaction or movement times.…”

Section: Discussionsupporting

confidence: 79%

Caffeine improves endurance in 75-yr-old citizens: a randomized, double-blind, placebo-controlled, crossover study

Nørager

Jensen

Madsen³

et al. 2005

Journal of Applied Physiology

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Norager, C. B., M. B. Jensen, M. R. Madsen, and S. Laurberg. Caffeine improves endurance in 75-yr-old citizens: a randomized, double-blind, placebo-controlled, crossover study. J Appl Physiol 99: 2302-2306, 2005. First published August 4, 2005 doi:10.1152/japplphysiol.00309.2005.-This study investigated the effect of caffeine on physical performance in healthy citizens aged Ն70 yr. The randomized, double-blind, placebo-controlled, crossover study was conducted in 15 men and 15 women recruited by their general practitioner. Participants abstained from caffeine for 48 h and were randomized to receive one capsule of placebo and then caffeine (6 mg/kg) or caffeine and then placebo with 1 wk in between. One hour after intervention, we measured reaction and movement times, postural stability, walking speed, cycling at 65% of expected maximal heart rate, perceived effort during cycling, maximal isometric arm flexion strength, and endurance. Analysis was by intention to treat, and P Ͻ 0.05 was regarded as significant. Caffeine increased cycling endurance by 25% [95% confidence interval (CI): 13-38; P ϭ 0.0001] and isometric arm flexion endurance by 54% (95% CI: 29 -83; P ϭ 0.0001). Caffeine also reduced the rating of perceived exertion after 5 min of cycling by 11% (95% CI: 5-17; P ϭ 0.002) and postural stability with eyes open by 25% (95% CI: 2-53; P ϭ 0.03). Caffeine ingestion did not affect muscle strength, walking speed, reaction, and movement times. At the end of the study, 46% of participants correctly identified when they received caffeine and placebo. Caffeine increased exercise endurance in healthy citizens aged Ն70 yr, but the participants' reasons for stopping the test may have varied between subjects, as the cycling test was done at ϳ55% of maximal oxygen consumption. Further studies are required to investigate whether caffeine can be utilized to improve the physical performance of elderly citizens. fatigue; perceived exertion; postural stability; elderly CAFFEINE INGESTION INCREASES the endurance of young people exercising at 60 -85% of their maximal oxygen uptake (12,13,38). It also seems to improve endurance as measured by repeated submaximal isometric contraction (34) and decreases the rate of perceived exertion during exercise (6, 9, 37). Typically, doses of ϳ6 mg/kg caffeine (equivalent to 4 cups of coffee) were used in these studies.With a growing number of elderly with a physically active lifestyle and many elderly participating in rehabilitation programs, the endurance-enhancing effect of caffeine is of increasing interest in this age group. However, the enduranceenhancing effect of caffeine found in young subjects has not previously been examined in the elderly.The aim of this study was to investigate whether 6 mg/kg caffeine improves physical performance and reduces the perceived effort during work in healthy citizens aged Ն70 yr. The main hypothesis was that caffeine would improve cycling endurance at 65% of expected maximal heart rate, and the secondary hypothesis was that caffeine would improv...

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Section: Discussionsupporting

confidence: 79%

Caffeine improves endurance in 75-yr-old citizens: a randomized, double-blind, placebo-controlled, crossover study

Nørager

Jensen

Madsen³

et al. 2005

Journal of Applied Physiology

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“…the 105%VO2max test and inversely decreased it in the IG test. In humans, whether caffeine enhances exercise performance during incremental exercise [13,15] and intense short-duration exercise [18,33] remains unclear. Furthermore, in humans the habituation and tolerance to caffeine as well as the training fitness state should affect the results.…”

Section: Discussionmentioning

confidence: 99%

“…ergogenic effects of caffeine during high intensity, shortterm exercise [18,33] or incremental exercise [6,15] remain unclear. Tarnopolsky [31] concluded that caffeine would not be ergogenic in the intense exercise that lasts less than 15 min.…”

mentioning

confidence: 99%

Effects of Caffeine on Performance, Cardiorespiratory Function and Plasma Hormonal Responses during Exhaustive Treadmill Exercise in the Thoroughbred Horse.

Kurosawa¹,

Nagata²,

Takeda³

et al. 1998

JES

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Caffeine is a central nervous stimulant, and its use is prohibited as a doping agent in human sports and horse races. It is considered by many athletes that caffeine improves sports performance and is thus an ergogenic aid. However, the effect of caffeine on exercise performance remains extremely controversial because of a lack of standardization among the various experimental procedures [24]. There is a better consensus on the beneficial effects of caffeine on prolonged endurance-type exercise [10,16]

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“…Entretanto, a utilização da cafeína como recurso ergogênico em atividades de alta intensidade e curta duração, tem gerado ao longo dos últimos anos controvérsias a cerca da sua eficácia (ANSELME et al, 1992;BRUCE et al, 2000;COLLOMP et al, 1991;DOHERTY, 1998;GREER et al, 1998;JACKMAN et al, 1996;WILLIAMS et al, 1988;WYSS et al, 1986).…”

Section: Introductionunclassified

A ingestão de cafeína não melhora o desempenho de atletas de judô

Pereira

Cyrino

Avelar

et al. 2010

Motriz. Rev. Ed. Fis. UNESP

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Resumo: O objetivo do presente estudo foi investigar os efeitos ergogênicos da ingestão de cafeína, sobre o desempenho motor de atletas de judô feminino. Participaram do estudo 13 atletas do sexo feminino (17,6 ± 1,6 anos, 58,3 ± 11,4 kg, 162 ± 4,1 cm, 22,5 ± 4 kg/m 2 ), vinculadas à Federação Paranaense de Judô, por pelo menos dois anos. O desempenho motor foi avaliado mediante a utilização do Special Judô Fitness Test (SJFT), a partir do qual foi analisado o número de arremessos em cada bloco, número total de arremessos, frequência cardíaca (FC) final e de recuperação e o índice no SJFT. Os sujeitos foram testados em duas condições, após ingestão de cafeína (6 mg.kg -1 ) ou placebo (dextrose) 60 minutos antes dos testes, em um delineamento duplo-cego, cruzado. O número de arremessos em cada bloco não diferiu entre as condições cafeína (CAF) e placebo (PL) (Bloco A: 4,53 ± 0,51 CAF e 4,46 ± 0,51 PL; Bloco B: 8,3 ± 0,63 CAF e 8,23 ± 0,72 PL; Bloco C: 7,23 ± 0,59 CAF e 7,46 ± 0,77 PL), bem como o número total de arremessos (20,07 ± 1,18 CAF e 20,15 ± 1,67 PL), FC (Final: 190,3 ± 9,63 bpm CAF e 190,69 ± 9,19 bpm PL; Recuperação: 162,07 ± 13,78 bpm CAF e 164,3 ± 9,64 bpm PL) e índice no SJFT (17,59 ± 1,4 CAF e 17,75 ± 1,98 PL). A ingestão de cafeína não melhorou o desempenho durante atividade de alta intensidade e curta duração em lutadores de judô. Palavras-chave: Judô. Cafeína. Desempenho motor. The intake of caffeine does not improve the performance of judoAbstract: The objective of this study was to investigate the ergogenic effects of caffeine on motor performance of judo female athletes. Thirteen female athletes (17.6 ± 1.6 years, 58.3 ± 11.4 kg, 162 ± 4.1 cm, 22.5 ± 4 kg/m 2 ), registered in the State Federation of Judo for at least two years, participated in this study. The motor performance was assessed using the Special Judo Fitness Test (SJFT), from which was considered the number of throws in each block, the total number of throws, recovery and final heart rate (HR) and final score in SJFT. The subjects were tested in two different conditions, after ingestion of gelatin capsules of caffeine (6 mg.kg -1 ) or placebo (dextrose) 60 minutes before testing in a randomized doubleblind, crossover study. The number of throws in each block did not differs between the caffeine (CAF) and placebo (PL) conditions (Block A: 4.53 ± 0.51 CAF and 4.46 ± 0.51 PL; Block B: 8.3 ± 0.63 CAF and 8.23 ± 0.72 PL; Block C: 7.23 ± 0.59 CAF and 7.46 ± 0.77 PL), as well as the total number of throws (20.07 ± 1.18 CAF and 20.15 ± 1.67 PL), HR (Final: 190.3 ± 9.63 bpm CAF and 190.69 ± 9.19 bpm PL; Recovery 162.07 ± 13.78 bpm CAF and 164.3 ± 9.64 bpm PL) and final score in SJFT (17.59 ± 1.4 CAF and 17.75 ± 1.98 PL). Ingestion of caffeine did not improve performance during high intensity and short duration exercise in judo fighters

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Caffeine, maximal power output and fatigue.

Cited by 54 publications

References 16 publications

Caffeine improves endurance in 75-yr-old citizens: a randomized, double-blind, placebo-controlled, crossover study

Caffeine improves endurance in 75-yr-old citizens: a randomized, double-blind, placebo-controlled, crossover study

Effects of Caffeine on Performance, Cardiorespiratory Function and Plasma Hormonal Responses during Exhaustive Treadmill Exercise in the Thoroughbred Horse.

A ingestão de cafeína não melhora o desempenho de atletas de judô

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