TSS from a run is meant to be calculated as (NGP/FTP)^2 * 100 * S / 3600 which is essentially the same formula as cycling with normalised power replaced by your normalised graded pace.
Isn't running harder on your body though?
2 hours at 70% of my 1hr speed will leave me fairly fatigued. However I do multiple consecutive days of 2hr rides with a normalised power of 70% FTP without any real issues. Similar if I compare a 1hr 80% run with a 1hr 80% bike ride - the run leaves more damage behind!
Simply put shouldn't we factor in the extract stress that the impact side of running has into the TSS formula? I've read elsewhere that you can be an effective runner on half the number of hours vs cycling - suggesting perhaps that running is twice as stressful than cycling at a given intensity. That's probably over counting the impact of running so maybe a factor of 1.5? I.E. 1hr at FTP(ace) is equal to 150 TSS?
To validate this you'd have to have a whole load of data from people who run and cycle (triathletes probably) and then run the data to see what factor gives you the best predictor of performance.
Any thoughts? Anyone else count their running TSS as higher than their cycling TSS?
Isn't running harder on your body though?
2 hours at 70% of my 1hr speed will leave me fairly fatigued. However I do multiple consecutive days of 2hr rides with a normalised power of 70% FTP without any real issues. Similar if I compare a 1hr 80% run with a 1hr 80% bike ride - the run leaves more damage behind!
Simply put shouldn't we factor in the extract stress that the impact side of running has into the TSS formula? I've read elsewhere that you can be an effective runner on half the number of hours vs cycling - suggesting perhaps that running is twice as stressful than cycling at a given intensity. That's probably over counting the impact of running so maybe a factor of 1.5? I.E. 1hr at FTP(ace) is equal to 150 TSS?
To validate this you'd have to have a whole load of data from people who run and cycle (triathletes probably) and then run the data to see what factor gives you the best predictor of performance.
Any thoughts? Anyone else count their running TSS as higher than their cycling TSS?