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Nutrition > Alkalisers And Buffers > Flashcards

Alkalisers And Buffers Flashcards

0
Q

During high intensity exercise what happens to ph and why

A

Increased concentration of h ions cause decreased ph

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1
Q

How does H ions cause fatigue

A

Impair calcium release
Binds to troponin impairs cross bridging cycle
ATPase and other enzyme inhibition

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2
Q

What happens to potassium levels in venous plasma

A

Increases

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3
Q

What happens to potassium in the interstitial fluid

A

Increase

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4
Q

What happens to potassium in intercellular

A

Decreases

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5
Q

In relation to potassium response why happens to sodium levels

A

Opposite effect

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6
Q

Dose size of sodium bicarbonate

A

0.3

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7
Q

What does sodium bicarbonate do

A

Decreases h ion concentration
Decreases potassium levels
Improved mean peak power
Improved power output for 1min all put sprint by 1.7%

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8
Q

What does sodium bicarbonate have the biggest effect size on overall give 1,2 and 3 highest

A

1-single bout
2-short length
3-long lenghr

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9
Q

What does sodium bicarbonate have the biggest effect size on for trained

A

1-long

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10
Q

What does sodium bicarbonate have the biggest effect size on for untrained

A

1-short length
2-medium length
3- single bout

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11
Q

What is the dose size for sodium bicarbonate and timing

A

0.3-0.5g

60-90 mins pre event

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12
Q

In summary what is sodium bicarbonate best for

A

1 min high intensity

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13
Q

What causes variation in results

A

Training status

Gi symptoms

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14
Q

Which fibre type has the most carnosine

A

Type 2

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15
Q

What reduces carnosine levels

A

Ageing

16
Q

Is there a sex difference in carnosine levels

A

Yes males have more

17
Q

What is a rate limiting factor for carnosine

A

B-alainie

18
Q

What two substances fight for absorption

A

Taurine and b-alainine

19
Q

What does too much b-alanine cause

A

Parastessia

20
Q

Recommended dose for b-alainine

A

6.4 grams per day

21
Q

A raise of how much in carnosine can yield benefits

A

50%

22
Q

How many grams of b-alainine does it take to reach 50% carnosine and how long

A

230g

  1. 4 x 34 days
  2. 6 x 160 days
23
Q

How much of b-alainine is washed out each week

A

2%

24
Q

How much carnosine is in the muscle

A

5-10 mM

25
Q

How much buffering in the muscle is due to carnosine

A

10%

26
Q

6g b-alanine a day for 4 and 10 weeks causes a rise in carnosine by how much

A

60% and 80%

27
Q

B-alainine causes a increase in force production in type 2 fibres when

A

At lower frequencies

28
Q

Benefits of b-alainine supplementation are

A

Improved time to exhaustion
Improved total work done
Improved training adaptations
Calcium handling

29
Q

When are the main benefits seen

A

Over 60s duration events

30
Q

What are the improvements for sodium bicarbonate, b-alainine and the combined

A
  1. 5%
  2. 1%
  3. 2%

Nutrition (11 decks)

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