Table 1.

Definition and illustration of parameters

parameters	definition	graphical interpretation
AA	the area under curve of the anacrotic phase	the area of the OPT curve
AC	the area under curve of the catacrotic phase	the area of the OPT’ curve
AT	the area under curve of a total period	the area of the TPT’ curve
MHA	the mean height of the anacrotic phase in terms of area
MHC	the mean height of the catacrotic phase in terms of area
MH	the mean height of a wave in terms of area
PBI	pulse beat interval	the time interval between adjacent troughs, T-T’
PPGA	the photoplethysmography amplitude	The height of line OP