Application of photoplethysmogram for detecting physiological effects of tractor noise

This study sought to investigate the effect of tractor noise on the cardiovascular system of farm workers by the photoplethysmographic technique, which was used to derive signal reflecting features of cardiovascular system performance. Fourier transform and nonlinear time-series analysis methods, such as time-delay embedding and the Wayland test, were applied to the photoplethysmogram signal to analyze differences in cardiovascular system...