Notes
Last day of "Liberecka vyzva", 7 days in a row - done, 70+km - done.
Ligaments and foots a bit tired, but 1 day rest should be enough, feeling quite ok.
Using new HR sporttester, "zone" was set to 148-175, 39:57 I was inside zone, 1 second I was above, rest (~3min) was under zone (at start of run). Min HR 103 (already running 20m slowly while setting up the gear for the run).
During 6h sleep I had total 3 hours HR in 38-49 range and 3 hours in 50-61, average HR 50.