Indoor vs. Outdoor Training (TSS)

[jkc]

Indoor vs. Outdoor Heart Rate

Found a little on this topic in searching the forum, but can’t quite find a direct conversation on this: I’m fairly new to TR, and I’m finding that I am reaching exhaustion at slightly lower heart rate levels indoors on the trainer than when I’m riding outdoors. I ride with a ceiling can on high and a 16" box fan blowing on me. In a bike race my HR reaches around 175, but when I’m indoors on the trainer, I feel like I’m about to blow up around 168 or so. I can’t tell if this is equipment/coo…