نتایج جستجو برای: central nervous system stimulants

تعداد نتایج: 2565169  

Journal: :International journal of sports physiology and performance 2007
Andrew Renfree

Numerous studies have demonstrated that induced alkalosis through ingestion of a sodium bicarbonate (NaHCO 3 ) solution can enhance performance during maximalintensity exercise of varying durations, as well as maintain performance during high-intensity intermittent exercise. Several studies have investigated the effect of dose ingested on subsequent exercise performance. For example, Horswill e...

2014
Hyun Jin Yoo Geun Hoon Choi Man Gyoon Lee Chang Kyun Kang Hyon Park

PURPOSE Various kinds of food substances from all over the world have been proposed to use as ergogenic aids for the additional improvement of exercise performance especially in athletes. Herb medicine which usually being applied for the cure of disease is used as a performance booster in several far eastern countries including Korea. Many scientists and coaches have asked very objective verifi...

2015
LAURIE M. LAWRENCE

The word “ergogenic” is derived from the Greek work “ergon” (work) and “genic” (producing). Thus, ergogenic aids are factors that can increase or improve work production. Improved work effort may occur as a result of increased strength, increased speed, increased endurance, etc. Many things fall into the category of ergogenic aids for human athletes including equipment, pharmacological agents, ...

Journal: :Sports medicine 2014
Jo Corbett Rebecca A Neal Heather C Lunt Michael J Tipton

Chronic exposure to a stressor elicits adaptations enhancing the tolerance to that stressor. These adaptive responses might also improve tolerance under less stressful conditions. For example, historically there has been much interest in the adaptive responses to high-altitude, or hypoxia, and their ergogenic potential under sea-level, or normoxic, conditions. In contrast, the influence of the ...

2015
Katie R Hirsch Meredith G Mock Erica J Roelofs Eric T Trexler Abbie E Smith-Ryan

Background Cordyceps militaris has been used in pre-workout supplement blends intended to improve aerobic performance. Mushroom blends containing Cordyceps may serve as an ergogenic aid by improving oxygen kinetics and delaying fatigue, but there is limited data on the effects of this ingredient during exercise. The purpose of this study was to determine the effects of 3 weeks of supplementatio...

Journal: :International journal of sport nutrition and exercise metabolism 2013
Denis M Pelletier Guillaume Lacerte Eric D B Goulet

Lately, the effect of quercetin supplementation (QS) on endurance performance (EP) and maximal oxygen consumption (VO2max) has been receiving much scientific and media attention. Therefore, a meta-analysis was performed to determine QS's ergogenic value on these variables. Studies were located with database searches (PubMed and SPORTDiscus) and cross-referencing. Outcomes represent mean percent...

Journal: :International journal of sports medicine 2006
A Alaranta H Alaranta J Holmila P Palmu K Pietilä I Helenius

Although athletes' beliefs and values are known to influence whether or not an athlete will use banned drugs, little is known about the athletes' beliefs and attitudes in different sports. The aim of this study was to clarify the beliefs and attitudes of elite athletes towards banned substances and methods in sports. A total of 446 athletes (response rate 90.3 %; 446/494) financially supported ...

Journal: :Pediatrics 2001
E Schirm H Tobi J M Zito L T de Jong-van den Berg

OBJECTIVE Although there is a global concern about the increased use of psychotropic agents in children, most research literature originates in the United States and is based on figures from the first half of the 1990s. Also, few studies document the use of various types of psychotropic agents. The objective of this study was to investigate the use of psychotropic medication in children in the ...

Journal: :Journal of the International Society of Sports Nutrition 2006
Allyn Byars Mike Greenwood Lori Greenwood Warren K Simpson

This study examined the effectiveness of a pre-exercise drink (PRX) called EM.PACT on indices of maximal cardiorespiratory fitness. Twenty-four males (n = 12) and females (n = 12) ages 18-24 years (20.25 + 1.42), volunteered as subjects. Each subject performed two randomized trials of a VO2max treadmill test within a week of each other. Subjects in this randomized, placebo controlled, counter b...

2018
Craig Pickering John Kiely

Caffeine use is widespread in sport, with a strong evidence base demonstrating its ergogenic effect. Based on existing research, current guidelines recommend ingestion of 3-9 mg/kg approximately 60 min prior to exercise. However, the magnitude of performance enhancement following caffeine ingestion differs substantially between individuals, with the spectrum of responses ranging between highly ...

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