Table 1.

Physiological conditions for RRI.

1. 0.3 s < $R{R}_j$ < 1.3 s,
2. Deviation ($E_r$) between the new $R{R}_j$ and the following RR interval must be lower than deviation computed over last 10 values
where:
$$E_r=\left|\frac{R{R}_{j+1}-R{R}_j}{R{R}_j}\right|\le E_{10}\le 0.4,$$ (4) 3. Deviation ($E_l$) between the new $R{R}_j$ and the following RR interval must be lower than deviation computed over last 10 values
where:
$$E_l=\left|\frac{R{R}_j-R{R}_{j-1}}{R{R}_{j-1}}\right|\le E_{10}\le 0.4.$$ (5)