Adjusting FTP and TSS for Altitude

Hi folks. I usually train at (or marginally above) sea level. I am going on holiday/vacation for 10 days in the French alps at 2000m/6050ft and have brought my trainer with me.

I’ve already established that this change in altitude on unacclimatised athletes is 6-10% depending on which study you look at.

Accordingly I reduced the intensity of my workout by 10% and then gradually increased it throughout the workout until I was at 6% reduction.

Because I had adjusted the intensity, at the end of the workout I was presented with the feedback survey as to why I’d ‘struggled’ (I’d actually felt pretty strong) and I selected ‘other’ and explained the situation. However this then made me realise it will have underestimated the TSS for that workout.

I then thought the best solution was to manually adjust my FTP for the period I am at altitude and leave the intensity at 100% but this then completely changed my whole training plan and progression levels.

So… I’m here… trying to find out what others have done in this situation and to see if TR might consider some kind of altitude setting that reduces the intensity of the workout but maintains your FTP and The corresponding TSS.

You’re in such a unique situation that it’s not worth it for TR to specifically address it. I would make the proper adjustments for each workout (ie: -6%) then answer the survey as if you didn’t fail. I’m not sure why you adjusted your FTP for 10 days of training. Your FTP didn’t change just your ability to express it. However, since AT changed your plan with this “new” FTP I’d look at past workouts’ PLs and use Alternates to match those. After a workout in that training zone AT will adapt your PLs to the level of the workout.

@MI-XC i adjusted my FTP as a rather crude effort to ensure the TSS applied to that workout appropriately reflected the effort/altitude. I didn’t realise it would mess up the whole plan and have subsequently reverted to my ‘correct’ FTP.

I’m now just ignoring the whole issue - doing workouts with an effective increase in intensity by 6% but it’s be great if the platform could use the location data from a users IP address and apply and altitude to a ramp test. If subsequent workouts have a different altitude then the TSS could be amended accordingly. I appreciate this will never be the top of their list in terms of demand but I think it should be on the list and addressed as and when they can.

I think there two issues at play here 1. How should you adjust your training at altitude and 2. How does TR adaptive training handle a trip to altitude.

I think #1 is easier to address - just reduce the intensity of your training like you have done. TSS will be off by a bit, but does that matter much? Leading to…

#2 totally depends on the algorithms TR has built into adaptive training. I don’t understand this well enough to have any meaningful ideas. If AT does not allow you to “zero out” the impact of a given workout, or takes into account low TSS to guide future workouts, then there could be an impact.

What workout was this? Was it a maximal one?