Heat and Hydration Matter

Key Lesson: Hydrate well for 24hrs before a hot ride

This week I had three sets of tempo intervals to complete and then two endurance-miles sessions to complete. Friday afternoon when I went out, I was not well hydrated and the heat (of the air, not from the road) was 95F. I finished the intervals but you can see in the first chart here that they were a stress on the system. The regression of heart rate to power is 0.21bbm/W and the 150bpm power is 119W. In the second chart, from the following day, I hydrated much better for the pre-ceding 18hrs and even though I’d been stressed the day before, the regression co-efficient is 0.15bpm/W and the 150bpm power is 195W.

Poor hydration means harder work per Watt

Poor hydration means harder work per Watt

 

Better hydration led to better cardiac efficiency

Better hydration led to better cardiac efficiency

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