Description Usage Arguments Details References
Calculate W' expended, i.e., the work capacity above critical power/speed which has been depleted and not yet been replenished.
1 2 
object 
Univariate 
w0 
Inital capacity of W', as calculated based on the critical power model by Monod and Scherrer (1965). 
cp 
Critical power/speed, i.e., the power/speed which can be maintained for longer period of time. 
version 
How should W' be replenished? Options include

meanRecoveryPower 
Should the mean of all power outputs below critical power be used as recovery power? See Details. 
Skiba et al. (2015) and Skiba et al. (2012) both describe an exponential decay of W' expended over an interval [t_{i1}, t_i) if the power output during this interval is below critical power:
W_exp (t_i) = W_exp(t_{i1}) * exp(nu * (t_i  t_{i1}))
However, the factor nu differs: Skiba et al. (2012) describe it as 1/τ with τ estimated as
tau = 546 * exp(0.01 * (CP  P_i)) + 316
Skiba et al. (2015) use (P_i  CP) / W'_0. Skiba et
al. (2012) and Skiba et al. (2015) employ a constant recovery power
(calculated as the mean over all power outputs below critical
power). This rationale can be applied by setting the argument
meanRecoveryPower
to TRUE
. Note that this uses
information from all observations with a power output below
critical power, not just those prior to the current time point.
Monod H, Scherrer J (1965). 'The Work Capacity of a Synergic Muscular Group.' Ergonomics, 8(3), 329–338.
Skiba PF, Chidnok W, Vanhatalo A, Jones AM (2012). 'Modeling the Expenditure and Reconstitution of Work Capacity above Critical Power.' Medicine & Science in Sports & Exercise, 44(8), 1526–1532.
Skiba PF, Fulford J, Clarke DC, Vanhatalo A, Jones AM (2015). 'Intramuscular Determinants of the Abilility to Recover Work Capacity above Critical Power.' European Journal of Applied Physiology, 115(4), 703–713.
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