Table 2. Model parameters (mean±SD) for performance and HF spectral components of HRV.

	Performance							HF spectral component of HRV
	Initial level	k1	k2	τ1(days)	τ2(days)	tn_P (days)	tg_P (days)	Initial level	k1	k2	τ1 (days)	τ2 (days)	tn_HF(days)	tg_HF(days)
Mean	1.42	0.00007	0.0011	50	4.8	14.47	25.87	8.36	0.007	0.18	42	4.2	12.71	22.93
SD	0.12	0.00006	0.0014	14	2.9	4.99	9.17	5.22	0.006	0.16	15	2.3	4.66	8.90

Initial level: Initial basic level of performance and HF spectral component of HRV.

k₁ and k₂ : multiplying factors respectively for the positive and negative component of performance and HF spectral component of HRV. τ₁ and τ₂ : time constants of decay for positive and negative components of performance and HF spectral component of HRV.

t_n : Critical period pre-competition in which training has a negative effect on performance (t_{n_P}) and HF spectral component of HRV (t_{n_HF}).

t_g : time pre-competition when training has maximum benefit.

k₁ and k₂ are expressed in arbitrary units depending on units used to quantify training load, performance and HF spectral component of HRV.