OK, I’ll just clarify my two earlier points then. Hydrogen ions are not believed to cause acidosis nowadays -neither does lactic acid, of course, which as a source of Energy can’t be dangerous. And there is no hypoxia above any ‘anaerobic’ threshold, however the latter is defined, which seems to depend on each person’s vocabulary 
I find it very hard to believe there is hypoxia in the human body at any point. Unless this has changed in the last 6 months, as I am not following the current relative literature from too close these days… Or unless, something is missing in the translation?