Where we've got an increase in protons, which is going to
cause an increase in ventilation, so now we're basically hyperventilating.
And now our PO, PCO2 is decreasing.
Okay?
So that's something that is going to happen during exercise, and it's,
particularly during vigorous exercise. The other thing to think about is the
change in minute ventilation, as we're doing exercise,
particularly, at the very beginning and at the very end - where if
you're a trained individual, your body learns
to anticipate exercise. And so, what we can get.
Is this feed forward process of the fact that the body knows that you're about
to do exercise.
So that as soon as you start, ventilation increases more than it actually needs to.
So we saw in the last slide that it just kind of increased linearly as you.
Increased your intensity. Here we're having this large jump at
step one where we have this instantaneous increase in minute
ventilation and anticipation to kind of get a jump
start on ventilation. Then as we keep going, it's going to.
Gradually keep increasing until we get to the end
where we will have a pretty rapid drop in ventilation,
but it's not back down to baseline. It's well
above baseline, and then it will slowly decrease down to baseline.
And so you're continuing to breathe.
More heavily than you need to considering what you are doing.
You all know this.
If you sprint for a long distance and then stop you are now at
that point maybe just walking or standing but you are still breathing very rapidly.
And so that's occurring
so that you can.
Get every all your systems back to base line.
So you're trying to remove what's called the oxygen debt.
Because of your exercise you have depleted
the stores of. Oxygen-saturated myoglobin.
So this is going to be a molecule that's very similar to hemoglobin that's
being, that's in the muscle, that can store oxygen in the muscle.
So after you exercise, those stores are going to be depleted.
So you're trying to keep that extra oxygen coming in to.
- load up myoglobin again.
And then, we remember, in muscle, we also talked about creatine phosphate, which
needs to be converted back, so that it can be used again.
So, those are going
into, over the next several minutes, be regenerated through this increase in
oxygen uptake. And then, we also might have lactic acid.
Around, so there, that might also be an aspect of the
increased ventilation is also correcting an acid base imbalance as well.
Okay, so we've talked about exercise, now we're going to finish up talking about
hypoxia, which is going to be a deficiency of oxygen in the tissues for some reason.