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Statistical properties of interbeat intervals cascade are evaluated by considering the joint probability distribution P(Δ x_2,τ_2;Δ x_1,τ_1) for two interbeat increments Δ x_1 and Δ x_2 of different time scales τ_1 and τ_2. We present evidence that the conditional probability distribution P(Δ x_2,τ_2|Δ x_1,τ_1) may obey a Chapman-Kolmogorov equation. The corresponding Kramers-Moyal (KM) coefficients are evaluated. It is shown that while the first and second KM coefficients, i.e., the drift anddoi:10.1142/s0129183106008704 fatcat:zeyl6nkrw5fkddkg5frjnk3woe