نتایج جستجو برای: subjects received caffeine or placebo in a double
تعداد نتایج: 20511839 فیلتر نتایج به سال:
In this study the effects of acute caffeine ingestion on exercise performance, hormonal (epinephrine, norepinephrine, insulin), and metabolic (free fatty acids, glycerol, glucose, lactate, expired gases) parameters during short-term withdrawal from dietary caffeine were investigated. Recreational athletes who were habitual caffeine users (n = 6) (maximum oxygen uptake 54.5 +/- 3.3 ml x kg-1 x m...
Caffeine Induced Changes in Cerebral Circulation To the Editor: We reported significant reductions in cerebral blood flow (CBF) 30 minutes and 90 minutes after the oral administration of 250 mg of caffeine in 14 normal volunteers (age 26 yrs, S.D. 6) in the SeptemberOctober 1985 issue of Stroke. As an extension of this study, we evaluated CBF responses to similar doses of caffeine in elderly su...
Introduction: Insulin resistance is one of the biggest medical problems in overweight population. So, the purpose of the present study is to determine the effectiveness of a four-week concurrent training with and without caffeine ingestion on the levels of insulin resistance indices of the overweight girls. Methods: For this purpose, 20 overweight female students resident in dormitories of Tab...
Introduction and purpose: Post-activation potentiation (PAP) is the phenomenon by which muscular performance is enhanced in response to a conditioning stimulus. The purpose of this study was to compare the effects of PAP induced by resisted, accelerated and traditional plyometric with and without caffeine ingestion on competitive judokas performance. Materials and Methods: In a randomized, c...
seismic retrofit strategies have been developed in the past few decades following the introduction of new seismic provisions and the availability of advanced materials and methods. it can be observed that new approaches to deal with more lateral forces are more innovative and more energy absorbent. in line with this, there is a growing trend toward the use of steel shear walls as a system with ...
Confusion and controversy exist regarding the cardiovascular effects of dietary supplements containing caffeine and Citrus aurantium (bitter orange) extract. The primary protoalkaloidal ingredient in bitter orange extract is p-synephrine which has some structural similarities to ephedrine and nor-epinephrine, but exhibits markedly different pharmacokinetic and receptor binding properties. The g...
Abstract Introduction Viloxazine ER (viloxazine extended-release capsules (Qelbree ® ) is a novel, nonstimulant, FDA-approved treatment for attention-deficit/hyperactivity disorder (ADHD) in adults and children ≥6 years of age. inhibits cytochrome P450-1A2, the enzyme responsible caffeine metabolism. In Phase 1 study, peak exposure (C max was unchanged, while systemic total (AUC) shown to incre...
The effects of caffeine (250 mg) and placebo on healthy controls were studied in a double-blind, cross over study on 24 healthy subjects who performed a working memory n-back task. Reaction time and accuracy levels were tested using the n-back working memory measure in cognitive neuroscience. An experimental study tested on the 1, 2 and 3-back tasks under the placebo/coffee condition. Based on ...
The aim of this study was to investigate the influence ADORA2A and CYP1A2 genotypes on physiological ergogenic effects caffeine. Sixty-six male cyclists were screened for genotypes; with 40 taking part subsequently in a randomised, double-blind, placebo-controlled study. Trial 1 used establish oxygen uptake?power output relationship maximal uptake. In trials 2 3, participants ingested 5 mg·kg ?...
background and aim: caffeine at low doses blocks adenosine receptors. these receptors are present in all parts of the body including auditory and vestibular system. this study aimed to evaluate the effects of caffeine on cervical vestibular evoked myogenic potential (cvemp). methods: in this interventional double-blind study, 40 cases (20 females and 20 males) aged 18-25 years were randomly ass...
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