running 50:00 [3]
So, yesterday I went interval training with the Warwick Uni O-club (I'm visiting for a week). First time doing intervals for a month. Training has been sub-optimal (to say the least) for the last few months, but I'm still reasonably fit...
Warm-up was maybe ten-fifteen minutes of jogging with a few strides thrown in.
1km intervals... first one I went out pretty fast but it didn't seem excessive - turned out to be 3mins - had no trouble running it.
2nd I ran with gg, maybe 2 seconds faster than before, had a little trouble!
3rd I had to slow down, maybe 25 seconds slower.
4th was similar
after the fourth i started getting slight pins and needles sensation in lower arm, head etc. decided not to run the fifth and final...
so some very slow jogging followed.
then started gentle jogging back to accommodation, felt pretty awful. dropped to a walk. was a bit cold, started having trouble breathing. then had trouble thinking and seeing... things were getting blurry
made it to a bus shelter and sat down... more of the same (not much vision left). got on a (warm) bus, put my head between my knees and waited for my system to start functioning "properly" again... by which time i realised the bus wasn't going the way i wanted and had left campus in the wrong direction. had a nice long walk home in tshirt and shorts, with a pause in the uni bar for some orange cordial drink on credit!
so... anybody out there with a physiological explanation? is this a "normal" occurence? should i be going to the doctor?