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Página 1 a partir de 538 resultados
Phosphatidylserine and caffeine attenuate postexercise mood disturbance and perception of fatigue in humans.
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Phosphatidylserine (PS) may attenuate the adverse effects of physical fatigue. Therefore, we investigated the effects of a multi-ingredient supplement containing 400 mg/d PS and 100 mg/d caffeine (supplement [SUP]) for 2 weeks on measures of cognitive function (CF), reaction time (RT), and mood (MD)
Fatigue related impairments in oculomotor control are prevented by caffeine.
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Strenuous exercise can result in an inability of the central nervous system to drive skeletal muscle effectively, a phenomenon known as central fatigue. The impact of central fatigue on the oculomotor system is currently unexplored. Fatigue that originates in the central nervous system may be
Caffeine, maximal power output and fatigue.
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The purpose of this investigation was to determine the effects of caffeine ingestion on maximal power output and fatigue during short term, high intensity exercise. Nine adult males performed 15 s maximal exercise bouts 60 min after ingestion of caffeine (7 mg.kg-1) or placebo. Exercise bouts were
Effects of caffeine on diaphragmatic contractility and fatigue.
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The effects of caffeine on diaphragmatic contractility and fatigue was investigated in 21 dogs. Diaphragmatic contractility was assessed by measuring transdiaphragmatic pressure (Pdi) during supermaximal stimulation of the phrenic nerves at different frequencies, and Pdi was measured with a pair of
Staircase, fatigue, and caffeine in skeletal muscle in situ.
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The specific locus of impairment in excitation-contraction coupling that is associated with skeletal muscle fatigue has not been identified. In the present study the phenomena of staircase and fatigue were studied in the rat gastrocnemius muscle in situ, and the effect of caffeine (50 mg kg-1) given
Effect of physiological levels of caffeine on Ca2+ handling and fatigue development in Xenopus isolated single myofibers.
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The purpose of the present study was to determine whether exposure to exogenous physiological concentrations of caffeine influence contractility, Ca(2+) handling, and fatigue development in isolated single Xenopus laevis skeletal muscle fibers. After isolation, two identical contractile periods
Posttetanic potentiation and skeletal muscle fatigue: interactions with caffeine.
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The purpose of this study was to determine the interaction of three factors that modify twitch contraction amplitude in the rat gastrocnemius muscle in situ: posttetanic potentiation, fatigue, and caffeine. Posttetanic (200 Hz for 1 s) twitch responses were observed before and after 15 Hz
Caffeine Increases Peripheral Fatigue in Low- but not in High-Performing Cyclists.
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The influence of cyclist's performance level on caffeine-induced increases in neuromuscular fatigue after a 4-km cycling TT was investigated. Nineteen cyclists performed a 4-km cycling TT one hour after ingesting caffeine (5 mg‧kg-1) or placebo (cellulose). Changes from baseline to post-exercise in
Performance of muscle strength and fatigue tolerance in young trained women supplemented with caffeine.
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BACKGROUND
The aim of this paper was to verify the effect of caffeine supplementation on the muscular strength and fatigue tolerance of young trained women.
METHODS
Eight women of 25±5-years-old, who had undergone a minimum of 12 months of continuous resisted training, Body Mass Index 20-23 kg/m2
Acute Low-Dose Caffeine Supplementation Increases Electromyographic Fatigue Threshold in Healthy Men.
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Morse, JJ, Pallaska, G, Pierce, PR, Fields, TM, Galen, SS, and Malek, MH. Acute low-dose caffeine supplementation increases electromyographic fatigue threshold in healthy men. J Strength Cond Res 30(11): 3236-3241, 2016-The purpose of this study is to determine whether consumption of a single
Modafinil vs. caffeine: effects on fatigue during sleep deprivation.
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BACKGROUND
The extent to which modafinil and caffeine reverse fatigue effects (defined as performance decrements with time on task) during total sleep deprivation was investigated.
METHODS
There were 50 healthy young adults who remained awake for 54.5 h (06:30 day 1 to 13:00 day 3). A 10-min
Fatigue-induced alterations in Ca2+ and caffeine sensitivities of skinned muscle fibers.
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The purpose of this investigation was to examine the Ca2+ and caffeine sensitivities of skinned skeletal muscle fibers after fatigue. Single frog semitendinosus fibers were chemically skinned in either a rested state or after tetanic contractions (80 Hz, 100 ms) evoked at 2 s-1 for 5 min. This
The Effect of Coffee and Caffeine Consumption on Patients with Multiple Sclerosis-Related Fatigue
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Background: Coffee and caffeine are considered to have beneficial effects in patients with multiple sclerosis (MS), an autoimmune disease of the central nervous system (CNS) that can lead to disability and chronic fatigue. Methods: In the present study the preference in terms of coffee
Modeling fatigue over sleep deprivation, circadian rhythm, and caffeine with a minimal performance inhibitor model.
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Sleep loss, as well as concomitant fatigue and risk, is ubiquitous in today's fast-paced society. A biomathematical model that succeeds in describing performance during extended wakefulness would have practical utility in operational environments and could help elucidate the physiological basis of
Effects of fatigue on depolarization- and caffeine-induced contractures of skinned fibres.
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OBJECTIVE
Fatigue has been shown to cause intrinsic alterations in sarcoplasmic reticulum (SR) Ca2+ release.
METHODS
In this investigation, frog semitendinosus muscles were stimulated to fatigue, in vitro (80 Hz, 100 ms, 1 train s-1, 5 min). Immediately after stimulation, single fibres were removed
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