Hemoglobin 19.1, Donate Blood?

[tareload]

@katzenjammer

So, if someone who’s ancestors lived in Bangladesh were to move to a remote community in the Swiss Alps, and - like everyone else in that community - developed high levels of red blood cells, they should start donating blood regularly?

Does Estrogen Make Me Fat? What about Fertility?

[image] Figure 2 Proposed mechanisms and hypothesised physiopathology at low altitude (<2500 m), high altitude (2500–3500 m) and very high altitude (>3500 m). O2 is the oxygen availability in relationship to sea level. FiO2: angiogenesis occurs at different elevations above sea level but during the hypoxic beneficial window, polycythaemia and red cell as well as platelet adhesiveness are not significant as above 3500 m, thus the protective effect reaches its maximum. Above 3500 m, althou…

From article:
When humans are exposed continuously to hypoxia, they develop adaptative mechanisms that are far more efficient than those observed in newcomers.50–53 These long-lasting mechanisms include anatomical (wider chests, shorter and lighter bodies, etc), embryological (smaller fetus and placentas), circulatory (improved maximum flow output and higher pulmonary arterial pressure) and respiratory adaptations (improved hypoxic ventilatory response and oxygen diffusion capacities).52 54–56 Chronic exposure to hypobaric hypoxia leads to the development of more subtle compensatory mechanisms. These factors include long-term erythrocytosis, angiogenesis, capillary remodelling and an improved ventilatory response57–60 (figure 2).