Appendix C – Dependence of O dos max Up on Atmospheric Level Top

Brand new Coriolis force try no on equator, and you may cyclones cannot mode around. This new Coriolis force try ideal within the middle-latitudes.

The latest interplay off Coriolis pushes and you may international convection currents contributes to deviations from sea-level stress and therefore, consequently, impact the computation regarding tension altitude.

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P I,O 2 is a simple, exponentially decaying function of pressure altitude. 1 In contrast, O dos max depends upon several physiological variables; and is, even today, not completely understood.

These variables include level of cardiovascular fitness, degree of altitude acclimatization, extent of hyperventilation, blood chemistry (especially pH shift), genetic heritage, individual size, and, of course, the ambient pressure. 2 max.

Personal size is trivially got rid of by the revealing maximal fresh air consumption for every single unit mass, O

However the remaining physiological variables are correlated, making it untenable that a model wherein O 2 max depends just linearly on these variables is viable,

Nevertheless it must be agreed that the overwhelmingly critical determinant of O dos max is altitude and its direct effect upon P I,O 2: no superfit, fully acclimatized mountain native at Mount Everest’s South Col can possibly compete with a sedendary lowlander at sea level.

In Equation (C.1b) falt (o) (P I,O 2) is the explicit dependence of O dos max upon inspired oxygen partial pressure for a predefined, baseline physiologic state (denoted by the « o » superscript); and fphys ( 1, 2, 3, . ) represents the collective linear and nonlinear variations of O dos max wrought by the aforementioned physiological factors. The baseline physiologic state may be that of a sedentary, unacclimatized individual residing at sea level.

One demonstrates that Equation (C.1b) is an inappropriate factorization as follows. A hypothetical, sedentary, and unacclimatized individual is unable to perform useful physical work at the summit of Mount Everest; and, indeed, would rapidly lose consciousness. His O dos max, although nonzero, does not meet that minimal amount required to maintain body functions even at complete rest.

It restriction outdoors practices proportion is approximately step 1

A very fit and fully acclimatized climber is able to perform useful physical work in this environment, as demonstrated by successful ascents of Mount Everest without supplemental oxygen. Consequently the ratio of their respective O 2 maximum on the left side of Equation (C.1b) differs markedly from unity; and by inspection, this ratio must be entirely due to the second factor on the right hand side since the first factor depends but on altitude.

At sea level these two individuals also differ in O 2 maximum, and, again, the ratio of their respective O dos maximum values must equal the ratio of their respective second factors on the right hand side of Equation (C.1b). 5 at sea level, once normalized to account for individual size variability. 2 As the second factor on the right hand side of Equation (C.1b) is independent of altitude, the same ratio must apply as well at Mount Everest’s summit.

A contradiction thus results since the acclimatized climber is certainly capable of achieving more than 1.5 times that O 2 maximum required to simply maintain consciousness: he has, after all, walked uphill to achieve the summit!

We conclude that O dos maximum cannot be simply factored into separate altitude and physiological components: a more general prescription is required.