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I ran an Ultra last month 30 odd miles. In a rather slow 6hr 50 but it was incredibly hilly.
Now when setting out for an ultra I am always too cautious and I'd rather be a bit more gung ho so to speak and see what I could really do.
Is their anyway of calculating say a minute per mile pace that you know your body could do for hours on end? Would perhaps keeping your heart rate under a certain number etc help? Or at what speed could you go before your body starts to really eat up your glycogen stocks?
I know the question has not been asked very well but I am hoping somebody knows what I am trying to get at.
Is the only way to get out there an experiment. Problem is I could do a LSW at 9 minute mile quite happily without raising the old heart but that will probably be too quick for a 50 miler for instance