ALTERNATIVE NORMALIZED POWER

Recently i have been asked to develop a new TSS, the TSS algorithm basically cuantifies the expenditure in terms of normalised power, this means that if you go further your avg power the tss exponential, but what i see is avg power is not a good data since you can do a very lite session but a lot of hours and TSS aparently will be a lot but that does not mean a real objective so what if we use an alternative normalized power based on your ftp and this is the results.