I went for a run today and went a lot further than normal--8 miles. I've never run that far before, and I've never run more than two miles at this altitude (I work in front computer all day and am in mediocre shape). I felt fine afterward and walked around a bit to cool down. I came inside, sat down at my computer, and started typing something.
Then I noticed something was wrong--my jaw was kind of stiff and my face was sort of "stiff" (with effort I could move it still) tending towards a slight grimace. I commented on this to myself and noticed I couldn't quite speak normally--my tongue was a bit stiff. I went to get my cell phone and was able to pick it up, but my hands clenched up and wouldn't respond to any commands. I could not dial any numbers. I was able to get the door of my apartment open and sort of lay down outside, cell phone still clutched in my inoperative claw-hands and unable to enunciate clear words. After a few minutes I was able to awkwardly pry open my clenched fingers on my knee and they started working again shortly after. I feel fine now--except for some pretty strong soreness in my fingers/wrists which I attribute to the clenching (feels about like they used to feel after cutting firewood for a few hours). At no point was I in any respiratory distress and I was fully conscious the whole time--my goddamn hands just stopped working, along with my tongue. None of it was painful, either--I just felt a tingly sensation in my fingers.
Well, what the fuck? I've never had anything like that happen to me before. The closest experience I've ever had is sitting on a hand by accident and cutting off the circulation for an extended period of time. Is this perhaps a blood flow issue, and maybe my ill-advised extended run decreased the blood flow to my extremities enough to cause something like this? I was kind of banking on the fact that, even if I overdid it, I'd pass out before doing any real damage (in retrospect "run until I pass out" is probably not a good plan either). I normally get uncomfortable tingly arms and hands when running--I'd assumed it was decreased blood flow (due to the increased demand in my legs) and nothing to worry about.
I'm not really concerned, necessarily, as this seems pretty directly related to suddenly running much further than I'm used to. I would like to find out what happened, though, and I can't seem to find much about this on the Internet.