Acute responses

Question 1

Define acute responses

Answer 1

The body’s immediate response to exercise that have a short duration, reverting back to pre-exercise levels following the ceasing of exercise

Question 2

Define Ventilatory threshold

Answer 2

When ventilation doesn’t increase at a linear rate. It occurs at arond 65-75% maximum oxygen consumption

Question 3

Name the two acute response in the respiratory system

Answer 3

Ventilation and diffusion

Question 4

What is Ventilation

Answer 4

how much air breathed in per breath per minute

Question 5

How is ventilation measured? What are the two components

Answer 5

RR X TV
o Tidal volume -How much air inspired or expired per breath
o respiratory rate -how many breaths per minute

Question 6

Outline the changes to ventilation at:

• light to moderate
• submaximal
• maximal intensities

Answer 6

• Light to mod. Exercise
linear relationship b/w ventilation and oxygen consumption
• Submaximal
Increases rapidly at start & plateaus 4-5 minutes into exercise
• Maximal intensity
Tidal volume plateaus but RR increases Ventilatory threshold reached

Question 7

Define diffusion

Answer 7

the movement of molecules from a region of high concentration to low concentration

Question 8

Define diffusion in respect to PE

Answer 8

The interchange of gases between the Alveoli and capillary tissue. Oxygen diffuses into the capillary membrane , oxygenating blood. Carbon dioxide diffuses from the deoxygenated blood to the alveoli, to be expired from the body.

Question 9

What happens to the diffusion capacity with exercise. Why?

Answer 9

It increases

• Causes by increase SA of alveoli and muscle tissue to increase intechange of gases

Question 10

Define cardiac output and the two factors that measure it:

Answer 10

• Cardiac output: the amount of blood pumped out of the heart every minute
  o Stroke volume: blood ejected left ventricle every minute
  o Heart Rate: the amount of times the heart beats per minute