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I seem to suffer more than most from needing to retch during races. Usually this is just after the finish line, but sometimes before. This has, on a number of occasions, cost me a PB. The last was at the Thame 10k, where a combination of heat and a small final incline before the finish took me just over the limit, and caused me to have to stop and be sick - cost me around 30secs compared to the rpevious 9k pace - just enough to miss a pb. The week before, a similar episode saw me lose out on 3rd place to a runner I thought was some way behind....
I suspect it's something to do with lactic acid, or oxygen deficit, but I'd be very interested to find out more, especially of there is anything I can do to prevent it (other than slowing down).
Any advice or info gratefully received!