Originally Posted by
veloboy971
Just picked up a power tap and am wondering how TSS scores work. I'm waiting on Training and Racing with a Power Meter to show up, so maybe theres a better explanation in there. I did read a bit on the internet and it ha a basic explanation that less an 100 is fully recovered by the next day, 100-200 may have residual fatigue for 1 day, 200-300 may have residual fatigue for 2 days, and greater than 300 may have several days residaul fatigue. Say all things are functioning properly in you body (and post workout nutrition is paid attention to), is this score supposed to diminish by 100 points per 24 hours after completion of the workout? Ie. You have a 200 TSS workout on Tuesday, Wednesday you will still feel fatigue as you still have 100 points left over, but Thursday you will be fully recovered as no points remain?
Also do these scores add together? Say you have the 200 TSS workout on Tuesday, followed by a 100 TSS workout on Wednesday, does is mean that if your score was 0 Tuesday before the workout and if your Wednesday workout was performed 24 hours (or slightly more) after the Tuesday workout your score going into the Wednesday workout would be 100 and as a result of the 100 workout on Wednesday would be 200 again after the workout? Thereby in theory leaving you with a score near 0 (and completely fresh on 48 hours from then - sometime Friday)?
given your strong mathematical background, i'll go into even more gory details.
CTL and ATL are nothing but exponentially moving averages.
CTL = (exp(-1/42))CTL (of yesterday) + (1-(exp(-1/42)))TSS (of today). ATL is the same, except the decay constant is over 7 days as opposed to 42. At the beginning, you have to "seed" the CTL and ATL in order for the numbers to be meaningful. Otherwise, you'll need to wait 35-42 days and then start using it.
Fatigue (TSB) is calculated based on yesterday's training load = CTL (of yesterday) - ATL (of yesterday)
TSS is basically a product of time and intensity. The intensity is determined by the ratio of the normalized power of the entire ride over your FTP.