Exercise Physiology - lecture 1
breaths/min
= 350ml x 10
= 3.5L/min
VE, Alveolar Ventilation & Acute
Exercise
· Volume inspired per breath = 1000ml
· Breaths per minute = 5
· Dead space = 150ml
· Minute volume (VE) = volume/breath x breaths/minute
= 1000ml x 5
= 5 L/min
· TASK: HOW MUCH AIR WILL REACH THE ALVEOLI?
· Alveolar ventilation = (inspired vol dead space) x breaths/min
= 850ml x 5
= 4.25L/min
VE & Acute Exercise
· Low intensities tidal volume.
· Higher intensities breathing frequency
Ventilatory Equivalent for
Oxygen
Volume of air ventilated (VE)
Volume of O2 used (VO2)
Rest = 20 25L of air per L of O2
Strenuous Activity = 30 40L of air per L of O2
· Relatively constant over a range of exercise levels,
indicating control systems for breathing is matched
by O2 demand.
VE/VO2
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