Acute responses

Question 1

What factors can influence acute responses in ventilation?

Answer 1

• pH.
• Temperature.
• Neural factors.

Question 2

What would occur in terms of ventilation during the ‘Rest to Work’ transition of exercise?

Answer 2

• Minute ventilation will increase abruptly at the beginning of the exercise.
• Followed by a slower rise in constant submaximal exercise.

Question 3

What leads to an increase in minute ventilation?

Answer 3

An increased rate + depth of breathing.

Question 4

How does minute ventilation increase?

Answer 4

• It increases in a linear relationship to oxygen uptake up to 50%-75% of VO2 max.

Question 5

What is the ventilatory threshold?

Answer 5

• When minute ventilation rises exponentially + disproportionality with O2 consumption.
• Ventilation is no longer linked tightly to oxygen demand.

Question 6

What responses can come about if the ventilatory threshold is reached?

Answer 6

• Fluids loss from sweating can cause an increased concentration of hydrogen ions influencing chemoreceptors to stimulate higher breathing frequency.
• In hot environments, ventilation drifts upward due to the influence of rising body temperature on the respiratory centre.

Question 7

List 4 acute responses in the respiratory system in exercise.

Answer 7

• Increased tidal volume.
• Increased respiratory rate.
• Increased minute ventilation.
• Increased pulmonary diffusion.

Question 8

What does an increase in pulmonary diffusion refer to?

Answer 8

• Leads to the splinting + dilation of capillaries.
• In the apical regions of the lung.
• Supporting greater diffusion capacity allowing more blood flow.