I'm fairly sure... You know how after a heavy lift or standing up too fast your high frequency hearing can become temporarily muted? It's like that, but more subtle, and longer lasting. More testing required, maybe I'll take blood pressure a few times over the course of the day and see if there's a correlation...?
I suppose it could also be opening of the sinuses too. If I'm stuffy everything sounds brighter and leaner than otherwise, perhaps the opposite is also the case
I'm the last person to comment: my HF hearing is permanently muted and I don't exercise. But I was once addicted to pottering-about rowing. And there was enough exercise to create arm muscle. And the mood change was more than just the river environment.
Sadly, for the purpose of this research, I never took music with me.
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