KNES 360 Lecture Notes - Lecture 21: Vo2 Max, Partial Pressure, Stroke Volume

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maroonarmadillo314

31 Oct 2017

School

University of Maryland

Department

Kinesiology

Course

KNES 360

Professor

Dr.Rogers

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Document Summary

Partial pressure of 4 major gases : most is nitrogen and then oxygen is 20%, and no h2o and less than 1% of co2. Partial pressure in alveolar and arterial blood is around 100 mmhg and during exercise _______ Comparing sea level to altitude: total atmosphere pressure- Now the o2-hb satutation levels are now low. Oregon, new mexico, northenrn arizona: need to live above 5000 ft, but if you live higher and in 7000-8000 ft, the benefits are reduced. Dempsey et all 1992- univ wisconsin distanc runners: track runners and mearued the partial pressure in alveolar air and arterial blood. Copd when go to moderate altitidue their conditions exaerterbate. Going to altitude is a problem for exercise performance: some do supplemental oxygen. Pre exercise: if you ca administer oxygen before exercise, then that supplemental oxygen that you breathe in within a matter of seconds will dissipate. Proposed ergogenic benefits: will enhance the exercise capacity, and time to exhaustion between 20-25%

Related Questions

PHYSIOLOGY

11. A subject is connected at FRC to a bag containing 2L of 8% He, 92% O₂. He rebreathes from the bag until mixing is complete; at which time the fraction of He is 4.6%. What is the value of FRC?

A. 1.15L

B. 1.48L (can you please explain this answer)

C. 2.48L

D. 3.48L

E. It cannot be calculated from the information given

The minimum time it takes a normal person to go from residual volume (RV) to total lung capacity (TLC) is less than the minimum amount of time to go from TLC to RV. The most probable explanation for this effect is:

A. the chest wall tends to spring outward when the respiratory system is at RV.

B. the chest wall is less compliant at RV.

C. inspiratory muscles are stronger than expiratory muscles.

D. the lungs have less recoil at TLC.

E. the airways tend to collapse during forced expiration. (can you please explain why this is the answer)

Two gases, A and B have the same partial pressure difference across the alveolar capillary barrier. Gas A has a molecular weight of 36 and solubility of 24 while gas B has a molecular weight of 16 and solubility of 2. What is the rate of diffusion of gas A through the barrier compared to gas B?

A. 12:1

B. 8:1 (can you explain why B is the answer?)

C. 6:4

D. 4:1

E. They are the same.

If an individual with a tidal volume of 500 ml and a dead space volume of 100 ml were to exercise and double the CO₂ production, with no change in respiratory rate, what tidal volume would be required to maintain their original P_CO2 of 40 mm Hg?

A. 1200 ml

B. 1100 ml

C. 1000 ml

D. 900 ml (can you explain why the answer is D?)

E. 800 ml

39. What is the total amount of oxygen in the arterial blood (in ml O₂ /100ml blood) of an individual who has P_O2=90mm Hg, P_CO2=40mm Hg, Hb=15g/100ml, hemoglobin saturation = 95%, (solubility coefficient of O₂=0.003 ml O₂/100 ml blood/mm Hg; at saturation Hb binds 1.34 ml O₂/g)

A. (0.95 x 15) + (95 x 0.003)

B. (90 x 1.34 x 15) + (95 x 0.003)

C. ((90 - 40) x 1.34 x 0.95) + (90 x 0.003)

D. (0.95x 1.34 x 15) + (90 x 0.003) (can you explain why the answer is D?)

E. none of the above

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KNES 360 Lecture Notes - Lecture 21: Vo2 Max, Partial Pressure, Stroke Volume

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