Yes, okay, obviously! I’ve seen people start their presentations with a complete freeze, during which they even ‘forget’ to breathe and I’ve seen people hyper-ventilate. Neither is pretty!
The latter is particularly interesting: I’ve just come across some research that suggests that over-breathing (such as when you’re presenting and nervous) for as little as only one minute can drastically reduce the amount of oxygen in your brain - with the obvious consequences that you more easily forget what it was you were going to say.
So your presentation hangs in the air - silence - and you get more nervous; that leads to more fight-or-fight breathing, less oxygen in your brain and more risk to your presentation. Long-term readers of this blog will know what I’m going to say next….
…breathe from the diaphragm, nice and slowly and you’re presentation skills will go up, not your blood pressure.
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