We went down to do the Triathlon cycle course this morning,
because the weather forecast for tomorrow is awful, and Benjamin does not like the rain.
There was a northerly breeze, which seemed to get stronger on each lap, which means the return leg of each lap was a serious struggle.
We did the 22 km in just over 60 minutes - average 22 km/hr. Not quite the 25 km/hr I would like to do, but it's ok - I keep reminding myself that the target of doing this with Benjamin is to complete it, not to be competitive, but I keep getting 'go faster' thoughts.
I did an experiment and did not eat during the ride - just a negligible
energy drink to stop me turning into a prune. I think I was starting to run out of oompf on the last return leg, but it was not bad - I suspect that not eating will encourage the muscles to store more glycogen, but I haven't checked if this is true or not. Will definitely need to eat for the race.
Ridewithgps.com says I used 430 calories (I am sure it means kcal, not cal), but it doesn't know I was pedalling the equivalent of a 70 kg bike into the wind, so it should underestimate.
I got a cheap heart rate monitor from tesco a couple of weeks ago. It said my average heart rate was about 155 bpm, and says I used 891 kcal. I guess heart rate should be a reasonable approximation to power output - I must read up how this works.
So now I must do some sums and decide what I need to eat to keep going at full power 891 kcal is 3.7 MJ, or over 3 Mars bars. I'll have to try to calculate how much energy I use in the swim. Sounds like a job for a rainy afternoon tomorrow!