I track two types of exercise in Strava, Cycling and Swimming.
On the bike, I simultaneously use a power meter and a Polar H10 heart rate monitor. My understanding is that Strava uses these two inputs to "calibrate" a Training Impulse estimate based on Relative Effort so that can be used for the times when I ride without a power meter or do something other than cycling.
My Fitness and Freshness page is set up to use both, "Power and Relative Effort."
When I bike, my power-based Training Load (which gets used directly for Training Impulse) is always about 0.7x Relative Effort.
When I swim, I wear a heart rate monitor and Strava calculates a Relative Effort. I expected Training Impulse to be about 0.7x Relative effort for the swims, because that's what it is when I bike with power meter and heart rate monitor. TSS is always smaller than RE on the bike. But I see the opposite result. From swimming, the "Training Impulse" is always about 1.3xRE.
When I bike, TI<RE, but when I swim, TI>RE (about the same ratio, but inverted).
Should I expect the TI:RE ratio from my cycling to carry over successfully to swimming? It doesn't
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Thank you for the reply, Jan. The article I linked above was from 2014. Back then, it looks like Strava automatically calibrated TRIMP from RE. As you said, it looks like they must have stopped doing that.