Respiratory Response To Exercise

Question 1

What are the factors that increase ventilation

Answer 1

Anticipation of exercise (psychological factors)

Activation of skeletal muscles and RCC from cortex

Excitatory impulses from proprioceptors in joints, muscles

Question 2

What is the potential increase in minute ventilation

Answer 2

5L per min to 200L per min

Question 3

Describe how this increase occurs

Answer 3

Firstly increase in TV ( an increase in RR at first would just cause and increase in dead space)

Secondly increase in RR after TV has increased by 50%

Ventilation not limiting factor to exercise capacity (enormous respiratory reserve)

Question 4

What are the other physiological changes that occur during exercise

Answer 4

Increase in capillary network in lungs (flicks)

An increase in concentration gradients of gases (more efficient exchange) ficka

Question 5

Describe how pathology might limit response to exercise

Answer 5

Rib #: may cause the patient to have a fear of breathing deeply. Apical breathing just moving dead space.
This will alter the mechanics of breathing and less gas exchange will occur stopping exercise.

Emphysema: the patient might have a hyper inflated chest and fatigued diaphragm, not able to produce mechanics of breathing in order to move air in and out of the lungs leading to less gas exchange stopping the exercise.

Question 6

What is hypernea

Answer 6

Increase in ventilation in response to metabolic demands