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I have two power files from a rider, both performed on the same PT300 indoor trainer but 8 weeks apart (testing) They are identical 20 min TT efforts. The figures have me confused;
TT1
211AP
11.39km
34.3kmh
86 Cad
TT2
208AP
13.86km
41kmh
102 Cad
Can anyone explain why the power for the second TT is lower but the distance travelled 2.4km farther ? The only significant difference lies in the cadence.
Maybe he turned his cooling fan off on the second one. You know, to cut down the headwind? 😉
Actually, it appears that the internal resistance of the stationary bike was on a different setting for the second run.
frenchyge said:Maybe he turned his cooling fan off on the second one. You know, to cut down the headwind? 😉
Actually, it appears that the internal resistance of the stationary bike was on a different setting for the second run.
But it's a PT equipped indoor bike - the PT simply measures the power at the hub therefore more resistance = more power ?
peterwright said:But it's a PT equipped indoor bike - the PT simply measures the power at the hub therefore more resistance = more power ?
Power is torque * rounds/sec.
Obviously in the second test the resistance was lower, rpm was higher and thus also mileage was higher, but the torque * rounds/sec was constant.
sidewind said:Power is torque * rounds/sec.
Obviously in the second test the resistance was lower, rpm was higher and thus also mileage was higher, but the torque * rounds/sec was constant.
Thanks for the explanation.
So in terms of work done - the rider actually did less in the 2nd TT than the first - as indicated by the Pave ?
peterwright said:Thanks for the explanation.
So in terms of work done - the rider actually did less in the 2nd TT than the first - as indicated by the Pave ?
Work done = Pave * effort_duration
So wether both TTs were exactly the same duration, then the lower Pave results also less work done.
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