Résumé:
The cardiovascular signals are, in general, quasi-periodicals with one period
which is not strictly constant. These variations are due to the action of the
autonomous nervous system (SNA).The first confronted problem is nonthe
stationnarity of signal HRV (variability of the rate of heartbeat) because of the state
unstable of the behavior sympathetic nerve and parasympathetic. To solve this
problem one will study balance sympatho-vagale expressed by the report/ratio of
the spectral density in the band of the low frequencies on that of the high
frequencies noted LF/HF by applying various methods; packet of ondelettes, K-S
Algorithm and autoregression model in order to extract from useful information on
the state of the individual in particular his physiological state which can be given in
the bands of frequencies LF and HF.
