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Sports Nutrition and Metabolism Yr 2 > Stimulant Supplements > Flashcards

Flashcards in Stimulant Supplements Deck (36)
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1

Give 2 effects of stimulants

• Change in mental function and behaviour (increase alertness)
• Production of excitement/euphoria
• Reduce sensation of fatigue
• Increase motor activity

2

State 2 legal stimulants

Caffeine
Guarana
Yerba Mate
Ma Huang/Ephedra
Ginseng

3

State 2 illegal stimulants

Cocaine
Ephedrine
Amphetamines

4

What is the half life of caffeine

5 hours

5

What is the maximum dose of caffeine

6mg/kg/BW

6

What does caffeine antagonise

cerebral adenosine receptors

7

Where is caffeine detoxified for excretion

The liver

8

Give 2 factors which could affect caffeine impact

Hepatic dysfunction
Habituation
Dose

9

True or False: Caffeine increases lipolysis

True

10

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

11

What are the central effects of caffeine

Increases norepinephrine/epinephrine

12

When caffeine increases norepinephrine/epinephrine, what does this increase?

Fat oxidation- CHO sparing

13

How does caffeine increase altertness

The adenosine receptors it targets cause sonambulance/decreased alertness, so by blocking these alertness is increased.

14

Give 3 examples of food/drink which contain caffeine

Coffee
Tea
Cola/Energy drinks
Chocolate

15

What is the precursor of caffeine that dark chocolate contains?

Theobromine

16

Which extracellular ion does Caffeine lower? and how?

Potassium - Na/K pump

17

How does caffeine affect blood pressure

Blood pressure also increased with caffeine due to the stimulation of the sympathetic nervous system.

18

How does caffeine effect RER

No effect

19

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

20

How does caffeine extend time to exhaustion

prolonging the maximal lactate steady state concentration until fatigue. It also reduced rate of perceived exertion

21

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

22

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.

23

True or false: Caffeine is a diuretic

False

24

How does caffeine improve concentration

• Keeping you awake
• Giving you a clear mind
• Increasing energy
• Increasing alertness

25

True or false: caffeine is effective for both single and multiple sprints

False- no effect on single sprints

26

State the fastest method of caffeine delivery

Caffeine gum

27

Give 2 positive effects of caffeine gum

Faster method of delivery and no GI side effects/co-ingestion required. Improved performance.

28

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
• Anxiety
• Tachycardia
• Blurred Vision

29

Describe
Peripheral Nerve and Transcranial Magnetic Stimulation

extensor
Different areas of the cortex effect different portions of the body.

30

What does an EMG test show

the membrane potential of motor units