Flashcards in Stimulant Supplements Deck (36)
Give 2 effects of stimulants
• Change in mental function and behaviour (increase alertness)
• Production of excitement/euphoria
• Reduce sensation of fatigue
• Increase motor activity
State 2 legal stimulants
State 2 illegal stimulants
What is the half life of caffeine
What is the maximum dose of caffeine
What does caffeine antagonise
cerebral adenosine receptors
Where is caffeine detoxified for excretion
Give 2 factors which could affect caffeine impact
True or False: Caffeine increases lipolysis
How does caffeine increase the force of muscular contraction
By causing a release of Ca2+ from the SR, which binds to troponin, allowing cross-bridge formation
What are the central effects of caffeine
When caffeine increases norepinephrine/epinephrine, what does this increase?
Fat oxidation- CHO sparing
How does caffeine increase altertness
The adenosine receptors it targets cause sonambulance/decreased alertness, so by blocking these alertness is increased.
Give 3 examples of food/drink which contain caffeine
What is the precursor of caffeine that dark chocolate contains?
Which extracellular ion does Caffeine lower? and how?
Potassium - Na/K pump
How does caffeine affect blood pressure
Blood pressure also increased with caffeine due to the stimulation of the sympathetic nervous system.
How does caffeine effect RER
How does caffeine effect fat oxidation
despite the elevated lipolysis, no fat oxidation occurred above normal levels (but may be some effects at lower intensities
How does caffeine extend time to exhaustion
prolonging the maximal lactate steady state concentration until fatigue. It also reduced rate of perceived exertion
Jeukendrup 2008 showed combined caffeine and glucose supplementation decreased fat oxidation, and increased CHO utilisation (from liver or exogenous). How was lipolysis effected
no effects of lipolysis due to the CHO introduction
Jeukendrup 2008 showed combined caffeine and glucose supplementation decreased fat oxidation, and increased CHO utilisation (from liver or exogenous). How was performance effected
There was an improved performance, by a quicker time trial with caffeine consumption.
True or false: Caffeine is a diuretic
How does caffeine improve concentration
• Keeping you awake
• Giving you a clear mind
• Increasing energy
• Increasing alertness
True or false: caffeine is effective for both single and multiple sprints
False- no effect on single sprints
State the fastest method of caffeine delivery
Give 2 positive effects of caffeine gum
Faster method of delivery and no GI side effects/co-ingestion required. Improved performance.
Give 3 side effects of caffeine
• Poor sleep quality (if taken later in the day due to half life)
o Harder to get to sleep
o Decreased drowsiness
o Poorer actual quality
• Blurred Vision
Peripheral Nerve and Transcranial Magnetic Stimulation
Different areas of the cortex effect different portions of the body.