This is the plot of HR (Heart rate) in BPM and pace (mph) from my Polar S625x watch from the Dublin Marathon on Monday 26th October 2009. HR zones are shown as the coloured horizontal bands. The HR curve is the black line, the pace curve is the blue line and the altitude (relative not absoloute) is the grey solid background.
As you can clearly see the HR for the opening 9 miles was unsustainable and then a run walk strategy was adopted with increasing amounts of walking vs. running until the final few miels when I managed to pick myself up. I didn't hit the wall, I didn't struggle, I just couldn't run any further, faster without walking as a result of 5 weeks of inactivity froma virus. (and putting 7lbs on) 5 weeks ago training was going great and I was hopeful of a time around 3 hours 20... but on the day I was pleased to finish in a somewhat dissapointing 4:35:38. Still, it was an enjoyable expereince and I now know I can still "finish" even off a less than ideal build up.
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