What is happening to me physically when running hard. Do I need to be concerned? Please advise.

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I go into oxygen debt...

no, you don't.

it was once thought that the energy systems in the body operated independently. so that when you were running anaerobically (without oxygen) you were acquiring an oxygen debt that had to be repaid when you stopped or slowed down. training focused on increasing the size of the oxygen debt you could accumulate before you had to stop or slow down.

this theory has since been overtaken by the simple observation that haemoglobin carries oxygen round the body all the time, even when you are holding your breath, running very fast, or standing on your head juggling chainsaws whilst whistling Dixie.

the "without oxygen" part of anaerobic running refers quite specifically to the metabolisation of ATP. this single process carries on without using oxygen but the rest of your body utilises as much oxygen as it needs. so, whatever you are experiencing, you are not going into oxygen debt.

cheers.

you was going too fast

It sounds like you might be hyperventilating... breathing too fast in short, shallow breaths.

Are you forcefully breathing in? Or rapidly breathing, almost panting?

If so, you're doing it wrong.

Oh hyperventalating might be my problem. I do tend to breath short and fast.

lkj wrote:

Oh hyperventalating might be my problem. I do tend to breath short and fast.

Check with a doctor to see if you have asthma.

You need to rest in between the repeats

cotton shirt wrote:

this theory has since been overtaken by the simple observation that haemoglobin carries oxygen round the body all the time, even when you are holding your breath, running very fast, or standing on your head juggling chainsaws whilst whistling Dixie.

That is totally false. Oxygen can only be exchanged at the cellular level when there is carbon dioxide in the cells to exchange with. That is usually the case but not always. Over breathing of oxygen causes excessive co2 to be washed out of the cells to the point that not enough oxygen can be exchanged to meet needs.

As soon as the person is no longer able to keep over breathing, the situation is reversed, and oxygen can again be exchanged at the cellular level.

Perhaps the OP is consciously trying to breathe too hard, which would cause the issue to arise.

The solution is to breath normally, and to not over breathe.

fisky wrote:

It sounds like you might be hyperventilating... breathing too fast in short, shallow breaths.

Are you forcefully breathing in? Or rapidly breathing, almost panting?

If so, you're doing it wrong.

Right. You nailed it.

Asthma symptoms are typically caused by over breathing of oxygen.

I don't think you can rule out some type of cardiac event/interruption.

you're probably simply out of shape