Caffeine increases endurance and attenuates force sensation during submaximal isometric contractions

Plaskett, Carrie; Cafarelli, E.

doi:10.1152/jappl.2001.91.4.1535

Cited by 103 publications

(117 citation statements)

References 45 publications

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“…The 54% increase in isometric arm flexion endurance is somewhat greater than the 17% reported in an earlier study (34). Although the exact cause of this difference is unknown, the subjects in the previous study were ϳ23 yr old and performed repeated quadriceps contractions.…”

Section: Discussionmentioning

confidence: 60%

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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: Discussionmentioning

confidence: 60%

“…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.…”

mentioning

confidence: 99%

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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“…However, the positive effect of caffeine on endurance and fatigue is well demonstrated in a large number of studies [5,[9][10][11][12][13]. It is not clear if this positive effect is related to a more effective muscular contraction.…”

Section: Musclementioning

confidence: 99%

Electrophysiological Studies in Healthy Subjects Involving Caffeine

Carvalho

Marcelino

2010

JAD

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Abstract. We review the electrophysiological studies concerning the effects of caffeine on muscle, lower and upper motor neuron excitability and cognition. Several different methods have been used, such as electromyography, recruitment analysis, H-reflex, transcranial magnetic stimulation (TMS), electroencephalography and event-related potentials. The positive effect of caffeine on vigilance, attention, speed of reaction, information processing and arousal is supported by a number of electrophysiological studies. The evidence in favor of an increased muscle fiber resistance is not definitive, but higher or lower motor neuron excitability can occur as a consequence of a greater excitation of the descending input from the brainstem and upper motor neurons. TMS can address the influence of caffeine on the upper motor neuron. Previous studies showed that cortico-motor threshold and intracortical excitatory and inhibitory pathways are not influenced by caffeine. Nonetheless, our results indicate that cortical silent period (CSP) is reduced in resting muscles after caffeine consumption, when stimulating the motor cortex with intensities slightly above threshold. We present new data demonstrating that this effect is also observed in fatigued muscle. We conclude that CSP can be considered a surrogate marker of the effect of caffeine in the brain, in particular of its central ergogenic effect.

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“…During submaximal isometric knee extension, for example, caffeine has been shown to increase time to fatigue; Kalmar and Cafarelli [10] observed a 26% increase in a sustained submaximal contraction of the quadriceps. Using intermittent protocols, both Plaskett and Cafarelli [11] and Meyers and Cafarelli [12] demonstrated a significant enhancement of the knee extensor time to fatigue with caffeine. All these studies on caffeine tested isometric endurance at a knee angle of 90°.…”

Section: Introductionmentioning

confidence: 96%

Effect of Caffeine on Fatigue During Submaximal Isometric Contractions at Different Knee Angles

Willems¹,

Madigan²

2011

Medicina Sportiva

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Introduction: In the knee extensors, the time to fatigue for intermittent isometric contractions can be increased by caffeine. Fatigue is muscle length dependent.Aim: We examined the effect of caffeine on fatigue of knee extensors at two joint angles. Methods: Ten male subjects (24±3 yr, 177±5 cm, 75±6 kg) with low caffeine intake (<200 mg·wk -1 ) volunteered. Study design was double-blind and counter-balanced. Subjects were administered caffeine (6 mg·kg

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Caffeine increases endurance and attenuates force sensation during submaximal isometric contractions

Cited by 103 publications

References 45 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

Electrophysiological Studies in Healthy Subjects Involving Caffeine

Effect of Caffeine on Fatigue During Submaximal Isometric Contractions at Different Knee Angles

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