“…To predict these different phenomena in a given system, several analysis tools for dynamic systems are needed, including : Time series, which allow the trajectory of the system to be observed over time; phase portraits, which characterise the presence of an attractor; bifurcation diagrams, which indicate the values taken asymptotically by a system as a function of its control parameter; the Lyapunov exponent, which provides information on the degree of sensitivity of the system to its initial conditions; and basins of attraction, which provide information on the set of initial conditions for which the trajectories of the system converge towards one of its attractors. In the biological and medical fields, the usefulness of this approach is well established; for example, we can mention the dynamic study of the growth of tumour cells (carcinogenic or not) [12,13], the dynamic study of renal function subjected to the consumption of water highly concentrated with magnesium and calcium particles [14], the study of a model of influenza disease [15], the study of a minimal glucose-insulin model [16], as well as the study of heartbeat models based on coupled nonlinear oscillators which has gained increasing interest since the work of Gois et al [17]; They formulated the heartbeat model as a system of three coupled non-autonomous modified Van der Pol oscillators [18] as this allowed on one hand to reproduce the electrocardiogram(ECG) signal of a healthy heart and on the other hand that of a diseased heart for some pathological behaviours (i.e. fibrillation, tachycardia, bradycardia) under certain conditions.…”