so I went out yesterday for a 3h high Z2 power ride and my heart rate was 20! bpm higher than on the trainer for the same wattage (a real steady Z2 ride, not just comparing avg. power). The weather was a windy 5°C, but I still had a tent-effect due to waterproof jacket. The decoupling though was as low as 2.2% and my RPE was just on point maybe even lower than for the same trainer ride. I would expect maybe 5-10 bpm higher outside than inside due to traffic, more muscle activation because of bike stability control. So has somebody made the same experience with this huge mismatch in the heart rates. Would you say this is due to the cold weather or more due to my tent-like climate.
Thanks and have a good day!