fsk = a1*ΔTsk,m[−]; for ΔTsk,m > 0
fsk = a2*ΔTsk,m[−]; for ΔTsk,m < 0
ΔTsk,m = (Tmean skin – 34.4)[K]
ø = b1*exp(b2/(ΔThy+0.4)+b3/(ΔTsk,m−4))[−]; ø = 0 when ΔThy+0.4 ≤ 0 or ΔTsk,m−4 ≥ 0
ΔThy = (Thypothalamic – 37.0)[K]
ψ = (τ− + τ+)/(1+ø)[−]
τ− = c1*dTsk,m/dt[−]; for dTsk,m/dt < 0
τ+ = c2*(dTsk,m/dt)max.exp(−c3*Δt)[−]; for dTsk,m/dt > 0
Δt = t−t0[h]
t0 = time of occurrence of highest rate dTsk,m/dt[h]
a1 to c3regression coefficients obtained through multivariate analysis, specific for the Stolwijk model

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