Our expert says:
I hate to admit, but I don't know what the cause of this might be. It's the first time I've ever encountered it. My first thought is a blood pressure thing - have you have BP measured after exercise? It might be interesting to see if it is changed. Other than this, I honestly am grabbing at straws to give you the reason. If it does happen more regularly, then you might consider seeing a doctor about it.
Sorry I can't be of more help, but i am not exaggerating when I say this is the first I've ever heard of this.
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