Respiration During Exercise

Chapter 10

Terms

Ventilation

Respiration

Pulmonary respiration

Cellular respiration

Ventilation

Inspiration

Diaphragm (rest and exercise)

External intercostal muscles (exercise)

Others (exercise)

Expiration

Internal intercostal muscles (exercise)

Abdominal muscles (exercise)

FYI

FYI

Structure of the Respiratory System

Conducting Zone

Respiratory Zone

Alveoli

FYI

Respiration

PO2 inside the venous blood = 40

PO2 inside the alveoli = 100

Therefore, O2 flows from the high pressure (lungs) to the low pressure (blood)

PO2 inside the arterial blood = 100

PO2 = 40

PO2 = 100

PO2 = 100

Respiration

PO2 = 100PCO2 = 40

7

PO2 = 40

Pulmonary Respiration

Cellular Respiration

Oxygen Saturation

97%Saturation

The Pulmonary System & Exercise

Control of Ventilation

CO2 CO2

Ventilation & Steady State Exercise

Ventilation & Maximal Exercise

Note the non-linear increase

in ventilation

Ventilation Threshold

CO2 from Krebs cycle stimulates

ventilation

CO2 from Krebs cycle and buffering

lactic acid stimulate ventilation even

faster

Aerobic Aerobic andAnaerobic13

Ventilatory & Lactate Thresholds

Exercise “Talk Test”

Ventilation & Exercise

Does the pulmonary system limit exercise performance?

Fatigue of respiratory muscles

> 80% of max and longer than 10 min

Exercise-induced hypoxemia

Training

20-30% decrease

Training

Do the lungs adapt to exercise training?

Do the respiratory muscles adapt to exercise training?

Pulmonary Diseases

Exercise induced asthma

Chronic obstructive lung disease (COPD)