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Respiration During Exercise
Terms
• Ventilation
• Respiration
• Pulmonary respiration
• Cellular respiration
Ventilation
• Respiratory Muscles• Inspiration
• Diaphragm (rest and exercise)• External intercostal muscles (exercise)• Others (exercise)
• Expiration• Internal intercostal muscles (exercise)• Abdominal muscles (exercise)
FYI
Structure of the Respiratory System
•Conducting Zone
•Respiratory Zone•Alveoli
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
Sea level = 97%
Saturation
Mount Everest = 48%
Saturation
The Pulmonary System & Exercise
Control of Ventilation
CO2 CO2
Ventilation & Steady State Exercise
Ventilation & Graded Exercise
Note the non-linear
Note the non-linear
increaseincrease
in ventilation
in ventilation
Ventilation Threshold
CO2 from Krebs cycle stimulates
ventilation
CO2 from Krebs cycle and
buffering lactic acid stimulate
ventilation even faster
Aerobic Aerobic andAnaerobic1
3
Ventilatory & Lactate Thresholds
Exercise “Talk Test”
3 4 5 6 7 8 9 10 11 mph
Ventilation & Exercise
• Does the pulmonary system limit exercise performance?
• Untrained - fatigue of respiratory muscles
• Trained - greater than 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?Respiratory Muscles
InspirationDiaphragm (rest and
exercise)External intercostal
muscles (exercise)Others (exercise)
ExpirationInternal intercostal
muscles (exercise)Abdominal muscles
(exercise)
Pulmonary Diseases
• Exercise induced asthma
• Chronic obstructive lung disease (COPD)