stimulants Flashcards
what are stimulants
stimulate the CNS with a marked effect on
- mental function and behaviour
- producing excitment
- reducing the senstaion of fatigue
- increased motor activtiy
legal stimulants
caffine
guarana
yerba mate
illegal stimulants
cocaine
ephedrine
amphetamine
how much caffine is normally used in research
6mg per kg body weight
how long does it take to respond to caffine
60 minutes
half life of caffine
5 hours
what affects caffine metabolism
hepatic dysfuntion - liver function
habituation - become more resistant if you take it more often
possible mechanisms of caffine
increased lypolysis
scaroplasmic retciclum Ca2+ release - increasing motor contractility
central effects - stimulates
effects of caffine on adrenoreceptors
when adenosine binds, causes the feeling of sleepiness
caffine is an adrenosine receptor agonists
caffine has a stronger affinity for receptors so prevents adenosine from binding
metabolic effect of caffine (graham at al 2000)
stimualtes lypolysis at rest - increase in plasma arterial FFA and FFA release
hormones stimulated by caffine - increase FFA
stimulates sympathetic NS - lowers extra cellular K+, makes Na+/K+ ATPase pumps more efficient
effects of caffine and cho
might be good during recovery
lowers fat oxidation
reduced time to complete task
effect of caffine in RPE
reduced RPE
possibly due to the effect on the CNS
effect of caffine on repeated sprint perfomance
peak power in cycling sprints improves with caffine
total work done significantly higher
reaction time also higher
effectivness of caffine is influenced by
timing
dose
mode of intake
habitiuation
beroca effects
reduced RPE
improved reaction time
improved numeric working memory
