Nasal sensation during hard riding

bear with me here.
When I have been riding a really hard effort for a while, I get this sensation inside my nose. It's like a cross between static electricity and a burning smell.
It happens on the turbo trainer and on the road, so it is not the turbo machinery or the bike. It definitely feels like it is coming from inside me, rather than externally.
It does not affect my performance and it is not painful, I'm just curious whether anyone else gets it and if anyone knows what causes it.
Feel free to take the p*ss if you haven't got anything helpful to say.
Many thanks
When I have been riding a really hard effort for a while, I get this sensation inside my nose. It's like a cross between static electricity and a burning smell.
It happens on the turbo trainer and on the road, so it is not the turbo machinery or the bike. It definitely feels like it is coming from inside me, rather than externally.
It does not affect my performance and it is not painful, I'm just curious whether anyone else gets it and if anyone knows what causes it.
Feel free to take the p*ss if you haven't got anything helpful to say.
Many thanks
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Why would you get a smell/taste of blood during hard effort anyway?