sto leggendo articoli e in questo periodo senza motivazione e di transizione, facendomi un'idea su questo paradigma CP e W' .
tra i vari SW proposti, quello di CPL (
http://www.cyclingpowerlab.com/Introduction.aspx) mi sembra quello piu facile da usare e in linea con le mie aspettative.
nella pagine dedicata a CP e ACW (W' se vogliamo) ho trovato un calcolatore per la stima della Tau del W'.
http://www.cyclingpowerlab.com/AWCReconstitution.aspx
mi sembra questo un parametro (Tau) molto importante se uno vuole adottare il paradigma.
ci sono proposti 3 test da fare in giorni diversi: ecco in calce la spiegazione
ieri ho provato, in base ai miei bassi valori di questa ultima stagione a fare il test 1: CP4 per 1min e poi 30" recovery a 80%CP.
devo dire che sono riuscito a fare ben 13 intervalli... il che mi fa pensare che :
a) la CP presa dal mio ultimo test e' piuttosto grossolana,
oppure
b) la CP e' stimata correttamente, ma la mia fatigue profile a VO2max e' molto buono anche da non allenato (il che non mi sorprende, conoscendomi)
continuero a fare i test, nei prossimi giorni e poi lascero il sito CPL calcolare la mia Tau.
la confrotero con quella stimata da GoldenCheetah.
semmai valesse l'ipotesi a) di sopra, credo che rifaro un test CP su tempi 1min, 5 min e 15min.
in parallelo, la version di goldencheetah 3.4 ha un CP e W' solver: in pratica si possono trovare la migliore stima di Tau, (o R se si usa il modello differential )basandosi su dei marker presi da uscite dove abbiamo registrato W'=0 o minore di 0.
in tal caso, uno puo stimare, nello spazio delle soluzioni delle equeazioni CP, W' e tau, il valore piu consono di Tau (o R)
il tutorial della funzionalita sulla V3.4 e' qui.
https://vimeo.com/160627324
molto interessante la considerazione di Mark sul fatto che Tau varia durante l'allenamento & gara: conferma che anch'esso trova il modello puramente matematico , con una Tau singola indipendente dal tempo - per esempio -, forse un po limitato ma comunque interessante, secondo me.
in questi giorni ho tempo, cosi mi diverto :D
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Establishing AWC Recharge Rates - The Time Constant "Tau"
For various reasons related to Oxygen delivery dynamics and further physiological factors Dr Skibas framework models reconstitution of AWC as an exponential function. Most people are familiar with the idea of exponentials rates of change which start out relatively slowly and then speed up or start out relatively quickly and then slow down either as time goes by or as some other relevant variable (in place of time) changes. Example the wind gradient model we discussed here says that wind speed slows as above-ground height of a pocket of air falls, but this slowing gets exponentially more pronounced as we get nearer to the ground and the air experiences ever more surface friction. (Pilots know this phenomenon as wind-shear).
In so far as this model is concerned all you need to know about exponentials is:
AWC in below-critical power cycling is around 39% recovered after 1 Time Constant. eg 300 seconds
AWC in below-critical power cycling is around 63% recovered after 2 Time Constants. eg 600 seconds
AWC in below-critical power cycling is around 95% recovered after 3 Time Constants. eg 900 seconds
Due to the gradual "convergence to asymptote" of an exponential functon, full recovery will in theory take a lot longer.
The Time Constant is itself modelled as a curve and is lowest (fastest) when recovery power is a long way below critical power and highest (slowest) when recovery power is very near to critical power.
[....]
Establishing or "Calibrating" the Tau Curve for an individual rider requires completing a number of interval workouts to exhaustion and then back-calculating or solving for the value of Tau based on this time to exhaustion. We feel that 3 tests may offer enough data to calibrate a reasonable "personal" curve without becoming too onerous and in this utility you can upload a "csv" file with data from 3 tests which will then be used to define a Tau Curve.
One possible protocol for these 3 tests which is implemented in the example file (the download is customised to the Critical Power & "CP4" established in the Monod Calculator above) is:
In all cases - Intervals of 60 seconds with 30 second recovery, ridden to exhaustion.
In all cases - Interval power of CP4 (the 4 minute sustainable power predicted by the rider's Monod CP Curve).
Recovery power of: Test 1) 80% CP. Test 2) 50% CP. Test 3) 20% CP.
Recovery power should be held as constant as possible. Remember we are essentially building a curve of the relationship between recovery rate and recovery power so varying recovery power too much within an individual test is not going to lead to good results.
Tests 1, 2 and 3 should take place on different days.
Naturally, in the CPL way, all you need do is create a file, hit "Solve Tau Function" and let is do the Math! The summary statistics and charts should be self explanatory.
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