Calculate Needed Training Load?

Training
18

I’ve been meddling around w/ this calculation and I was using the same formula as you namely:

let newAtl = prevAtl + (TodayTSS - prevAtl)/7
let newCtl = prevCtl + (TodayTSS - prevCtl)/42

BUt when I compare the data with that from intervals.icu’s wellness API endpoint, I get some differing number (rounding delta of 1 or -1 from my calculation and that of intervals.icu)

It took some digging, but the formula from @JASON_C_WILLIAMS

  • ATL = (ATLyesterday)(e(-1/k))+ (TSStoday)(1-e(-1/k))
  • CTL = (CTLyesterday)(e(-1/k))+ (TSStoday)(1-e(-1/k))

Was the key to consolidating the numbers from my own calculation and that of intervals.icu (now they match)

Somehow, the formula used by @david for intervals.icu and that @JASON_C_WILLIAMS got is different from that of TP’s article you linked. https://help.trainingpeaks.com/hc/en-us/articles/204071884-Fitness-CTL-

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