Flashcards
1036 - ventilation responses to exercise
Cards in this deck (14)
- 1Define minute ventilationThe amount of air moved per minute
- 2What are the factors that determine minute ventilationtidal volume and respiration frequency
- 3define tidal volumethe amount of air that moves into the lungs
- 4define respiration frequencythe number of breaths
- 5what is the equation for minute ventilationtidal volume x respiration frequency
- 6type values for tidal volume, respiration frequency and minute ventilation at restVt = 0.5L
Fr= 15 breaths
Ve= 7.5L/min - 7type values for tidal volume, respiration frequency and minute ventilation at maximal exerciseVt= 3-3.5L
Fr= 40-50 breaths
Ve= 120-175L/min - 8Why does minute ventilation increase with exercise?During exercise, tidal volume and respiration frequency increases as when you exercise your muscles need increased ATP for muscle contraction, which is done through increases respiration in the cells mitochondria. As a result there is an increase in concentration of Carbon Dioxide as carbon dioxide is a product of respiration. Therefore, there will be an increase in Tidal volume and respiration to increase exhalation of carbon dioxide and allow for greater efficiency in gas exchange so oxygen can be delivered through the blood to the body and lungs. Therefore, the minute ventilation will increase.
- 9Define alveolar ventilation and how it is calculateddefine; the amount of air that reaches the alveoli each minute
calculated; (tidal volume - dead space) x respiratory frequency - 10Define dead space and its typical values for men and womenOnly a part of respiratory minute ventilation will reach the alveolar exchange surfaces. The volume of air remaining in the conducting passages is the dead space
men - 150 ml
women - 120ml - 11Define and explain MVV (maximum voluntary ventilation)Define - MVV is the maximum volume that can be exhaled per minute by breathing as deeply and rapidly for 15 seconds and then extrapolated for 1 minute
- 12What is the relationship between Vemax and MVVthey are not physiologically related
- 13What is the breathing reserve and values for healthy person and COPD personthe breathing reserve is the difference in MVV and Vemax
calculated for percentage = 100*(MVV-Vemax)/ MVV
healthy= equal or greater than 20%
COPD = equal or less than 20% - 14use the breathing reserve concept to explain whether ventilation limits exercise capacity in; - healthy person - a patient with chronic obstructive pulmonary disorderIn a healthy person the breathing reverse is greater than 20%. Therefore, our maximum voluntary ventilation capacity is much larger than our ventilation capacity that we are using during exercise. Therefore, ventilation does not limit exercise capacity in a healthy person.
However, in a patient with COPD the MVV capacity is much smaller. This means that our ventilation capacity is very smaller to the MVV capacity causing ventilation to limit exercise capacity.
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- Flashcards on 1036 - ventilation responses to exercise , created by Sonia Giga on 04/04/2020.
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