Related Experiment Video
Updated: Jul 29, 2025
08:33
Experimental Protocol for Examining Behavioral Response Profiles in Larval Fish: Application to the Neuro-stimulant Caffeine
Published on: July 24, 2018
11.2K
Caffeine Enhances 10-km Cycling Performance in Habitual Users Only When Preceded by Caffeine Abstinence.
Timothy D Griest1, Michael J Saunders1, Christopher J Womack1
1Human Performance Laboratory, Department of Kinesiology, James Madison University, Harrisonburg, VA,USA.
Summary
Caffeine supplementation enhances cycling performance in habitual users only when caffeine withdrawal is present. This suggests that caffeine
Area of Science:
- Exercise Physiology
- Nutritional Science
- Sports Performance
Background:
- Caffeine supplementation is widely used to enhance athletic performance.
- Habitual caffeine users may experience withdrawal symptoms affecting performance.
- Previous studies often fail to control for caffeine withdrawal effects.
Purpose of the Study:
- To evaluate the performance benefits of caffeine supplementation in habitual users.
- To investigate the impact of caffeine withdrawal on performance.
- To differentiate the effects of caffeine from withdrawal in recreational cyclists.
Main Methods:
- Ten recreational cyclists completed four 10-km cycling time trials.
- Participants received either caffeine or placebo 8 hours and 1 hour before exercise.
- Experimental conditions included caffeine withdrawal and non-withdrawal states.
Main Results:
- Caffeine withdrawal did not significantly impair cycling power output.
- Caffeine supplementation improved time trial performance only in the presence of caffeine withdrawal.
- No significant performance enhancement was observed when caffeine withdrawal was mitigated.
Conclusions:
- Pre-exercise caffeine benefits recreational cycling performance primarily when withdrawal symptoms are present.
- Habitual users may not experience performance gains from standard caffeine doses (6 mg·kg-1).
- Existing research may overestimate caffeine's ergogenic value for habitual users; higher doses warrant investigation.
More Related Videos
04:54Using a Combination of Indirect Calorimetry, Infrared Thermography, and Blood Glucose Levels to Measure Brown Adipose Tissue Thermogenesis in Humans
Published on: June 2, 2023
1.4K
10:28Assessment of Cocaine-induced Behavioral Sensitization and Conditioned Place Preference in Mice
Published on: February 18, 2016
17.2K
Related Concept Videos
01:29Stimulants
257
Stimulants are substances that enhance neural activity and elevate dopamine levels in the brain, leading to their highly addictive nature. These drugs include cocaine, amphetamines, MDMA, caffeine, and nicotine, each with distinct mechanisms of action and varied health implications.
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
Cocaine can be administered via snorting, injection, or smoking. It primarily functions by blocking the reuptake of dopamine, resulting in a euphoric high characterized by an intense sensation of happiness and...
257
01:24Substance Use Disorders Affecting Sleep
199
Substance use disorders involve a pattern of using drugs more extensively than intended and continuing use despite harmful consequences. This includes legal substances like alcohol and nicotine, as well as illegal drugs. These disorders often involve both physical and psychological dependence, reflecting compulsive use of substances that significantly alter thoughts, feelings, and behaviors, contributing to a major public health issue.
Understanding the concepts of physical dependence,...
Understanding the concepts of physical dependence,...
199
01:16Experimental Designs
11.6K
An experimental design is a systematic process that allows researchers to evaluate the relationship between dependent and independent variables. There are three widely used types of experimental design - pre-experimental design, true experimental design, and quasi-experimental design. In pre-experimental design, the researcher compares the data before and after some interventions or treatments. The true-experimental design has more than one purposefully created group, a commonly measured...
11.6K
01:24CNS Stimulants: Cocaine, Amphetamines and Cannabinoids
291
CNS stimulants, such as cocaine, amphetamines, and cannabinoids, have varying structures and mechanisms of action that lead to different therapeutic effects and side effects. Cocaine, with its molecular formula C17H21NO4, is a tropane alkaloid and a tertiary amino compound. It has two chemical forms: the hydrochloride salt and the "freebase." The former is in powder form, while the latter involves removing the hydrochloride salt to create a form that can be smoked. Cocaine exerts its...
291
01:30Cognitive Enhancers: Cholinesterase Inhibitors and NMDA Receptor Antagonists
166
Cognitive enhancers, also known as "smart drugs," are substances used to enhance memory, mental alertness, and concentration. These can be natural or synthetic and improve cognition in conditions like Alzheimer's disease (AD) and other neurodegenerative diseases. Some common examples include caffeine, amphetamines, methylphenidate, modafinil, arecoline, donepezil, vortioxetine, and piracetam. These enhancers work on the principle of synaptic plasticity and altered circuit function.
166
01:20Exercise and Cardiovascular Response
879
Exercise significantly impacts cardiovascular response, which is crucial for understanding patient health and designing effective treatment plans.
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
Light to moderate physical activity initiates a series of interconnected responses in the body. The heart rate modestly increases in anticipation of the workout, followed by widespread vasodilation as oxygen consumption by skeletal muscles increases. This results in decreased peripheral resistance, increased capillary blood flow, and accelerated...
879