Lactate Transport

Question 1

What is said to be true about the highest Lactate Threshold pressure when given on a figure as an example?

Answer 1

Highest Lactate pressure = Longer a person can exercise

Question 2

How many Carbons does Lactate have?

Answer 2

It’s a 3 Carbon Glucose Molecule

Question 3

What is Lactate’s role during transport?

Answer 3

To help buffer & help transfer/push H+ out of the cell

Question 4

At physiological pH, is there “Lactic Acid”?

Answer 4

No, just lactate and protons (H+)

Question 5

What percent of all Lactate is oxidized during exercise?

Answer 5

80%

Question 6

True or False: Lactate is a 3C fragment of Glucose.

Answer 6

True

Question 7

What facilitates the transport of pyruvate across the inner mitochondrial membrane?

Answer 7

By MCT1

Question 8

What ‘COX’ stand for?

Answer 8

Cytochrome Oxidase

Question 9

Where is O2 utilized in cells during Lactate Oxidation?

Answer 9

In the Mitochondrial COX.

Question 10

How does Lactate become oxidized?

Answer 10

Lactate Transporter gets Lactate oxidized to pyruvate via Mitochondrial LDH.

Question 11

Lactate Threshold is the best measure of what?

Answer 11

Performance

Question 12

Which system of energy uses Oxygen?

Answer 12

System 3 (Aerobic/Mitochondria Metabolism)

Question 13

What is the point at which blood lactate accumulates substantially above resting concentrations during exercise of increasing intensity?

Answer 13

Lactate Threshold

Question 14

What are the differences in Lactate Threshold max between untrained and trained people?

Answer 14

Untrained: 50-65%
Trained: 65-80%

Question 15

True or False: LT is usually expressed as an average of maximal oxygen uptake.

Answer 15

False, it’s expressed as a percentage of maximal oxygen uptake.

Question 16

True of False: LT is related to exercise intensity & demand for ATP, and isn’t anaerobic.

Answer 16

True.

Question 17

True of False: A low LT can indicate potential for better endurance performance.

Answer 17

False, the higher the LT, the better potential for increased endurance performance.

Question 18

Lactate Threshold is the rate at which Lactate ___________ (Ra) __________ Lactate Clearance (Rd).

Answer 18

Production; exceeds

Question 19

At rest, Lactate appearance is about _____ of Glucose appearance and disappearance.

Answer 19

Half

Question 20

Ra (rate of ____________) is matched by Rd (rate of ______________) and is (below/above) LT

Answer 20

Appearance; Disappearance; Below

Question 21

As exercise intensity increases, what happened with respect to ATP production, Ra of Lactate in venous blood, and the rate of Lactate removal from the blood (Rd)?

Answer 21

ATP Production: Greater demand for rapid ATP production
Ra of Lactate in blood: Increases
Rd of Lactate in blood: Exceeded

Question 22

What organs removes Lactate, how, and what happens to the total concentration of Lactate?

Answer 22

Heart, Liver, Kidney, & resting Muscles; Total Lactate concentration increases.

Question 23

Does increased LT allow for exercise at a higher/lower % VO2 max?

Answer 23

Higher

Question 24

Does increased LT increase/decrease exercise pace?

Answer 24

Increase

Question 25

How could you improve training techniques?

Answer 25

Putting a HR monitor on a person and measuring their LT.

Question 26

What improves the ability to remove Lactate during exercise?

Answer 26

Training

Question 27

What happens to the following when you increase the ability to remove Lactate during exercise:
A) Rd
B) Ra
C) Mitochondrial size/mass
D) Muscle buffering capacity

Answer 27

A) Rd = Increases

B) Ra = Decreases

C) Mitochondrial size/mass = Increases

D) Muscle buffering capacity = Increases

Question 28

Which of the following increases to a greater degree with improved training, Lactate or VO2 max?

Answer 28

Lactate

Question 29

What is Rd (Lactate removal after exercise dependent upon?

Answer 29

Exercise intensity and duration

Cool-down/Active recovery