Last week I had couple of zone 2 rides and saw that my TSS on training peaks and Load on interval.icu was completely different.
Just wanted to ask the experts here that whether Load = TSS
If its the same then is there any setting or adjustment I have not done and because of that my numbers are shown wrong?
I am attaching screenshots of my training
This is from interval.icu
This from training peaks
TrainingPeaks number is hrTSS = HeartRate TSS. This is by no means standard, because there’s no standard way of calculating Load/TSS from HR. Even if your HR zones are setup exactly the same, the numbers will not correspond because soem calcuate based on HRmax, others based on LTHR and some on HRreserve.
You can only compare TSS from power and that should be very similar.
If you don’t have Power, that’s not a really big deal. The numbers may differ but the trend of the ATL/CTL/TSB will look the same. And that’s what is important, not the absolute number.
Is there any way that I can get an estimated hrTSS.
I just saw this above article on training peaks.
it says that the hrTSS is based on time in heart rate training zone. Derived from LTHR
So should I set my load calculation based on time in zone or should I let it be to HRSS (normalized TRIMP)
HRSS is the most robust. So long as you have filled in your resting HR, max HR and LTHR it should give good results. If you often ride with power and HR then you can use the “time in zones” model for HR-only rides. This is specific to you based on your previous rides with power and HR and in my experience gives good results.
So Changing the type of load calculation (HRSS to Time in zone) will change the planned load for future planned workouts?
because I tried doing so and it didnt change any load calculation for future workouts
It can’t because there are no numbers for future resting HR, max HR and LTHR.
Hi there – on a related topic … Load in intervals.icu is described as % of FTP in an hour. So an hour riding at FTP would have a load of 100
However, in a recent ride Intervals.icu I rode for 1 hour (well, 1h 0m 30s) at 162w (177 NP) average against an FTP of 230. So the Load should have been 70 (or 77 if using NP). i.e. 162 is 70% of 230
But Load got recorded as 60.
How so – am I misunderstanding how the Load calculation works?
IF (Intensity Factor) would have been 0.77 using NP.
But you need to square that to get Load. Then you get 60.
Thanks I was not aware of the squaring component … esp since an IF of 1 is also a Load of 1 (1 x 1 = 1). I shall had to read up on this ! Thx again
So to compare this with TSS (= (sec x NP® x IF®)/(FTP x 3600) x 100)
TSS would be ((3630 x 177 x 0.77) / (230 x 3630) x 100) = (494733 / 834900) x 100 = 59
So TSS and Load are the same thing (assuming small rounding errors in my calculation)
If I’m right it does beg the question why the TSS equation is not simplified to IF x IF
TSS = Load. But Intervals can’t use TSS officially because it is trademarked.
IF = NP/FTP for the whole activity.
Load = TSS = IF squared multiplied by duration 
Your calculation has NP x IF / FTP where NP / FTP is IF.
That’s the same as sec x IF² / 3600 x 100. For 1 hour, this is IF² x 100. For 2 hours, that is IF² x 200.
I wish I had listened in maths class now LOL
Hi
My Suunto Vertical used on a hike today showed a TSS (hr) load of 107 which is identical to my TP analysis (hrtss).
On Intervals I have my setting at HRSS and it gives me 69. I know from this thread there is no standard for TSS in the absence of power. It’s just unfortunate that if I look at my watch or my Suunto app they differ from Intervals, although the trends should be consistent.
I enjoy using the Suunto app and when I switch to Intervals I must translate. Just an observation from a user experience perspective
