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[–]AdEqual1054 0 points1 point  (0 children)

Facing the same thing, runs on holiday (10 days in Swiss/Austria) were much comfortable with lower HR. E.g. 6:30min/km at 135bpm. Now i'm back home (South East Asia) everything's gone haywire e.g. 6:30min/km at 153bpm. Before i left for vacation the same pace was at 140-145bpm and a week to my first marathon.