Key result
Exposure to tractor noise significantly altered cardiovascular system performance as detected by photoplethysmogram, with the Wayland test translation error reliably distinguishing between background and noisy conditions (p=0.001).
Why the study?
Can photoplethysmogram signal features detect physiological effects of tractor noise on the cardiovascular system in farm workers?
Observational (n=7)
No
Can photoplethysmogram signal features detect physiological effects of tractor noise on the cardiovascular system in farm workers?
p-value: p=0.001
Photoplethysmogram signal analysis using Wayland test translation error may serve as a useful, subject-independent index for real-time health monitoring of farmers exposed to tractor noise.
May detect tractor noise effects on cardiovascular performance via photoplethysmogram in farmers; leaves open utility for real-time monitoring.
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 performance arising upon exposure to levels of tractor noise corresponding to low, medium and high tractor engine speeds. Results showed that the ratio of two significant component frequencies obtained by Fourier analysis and Wayland test translation error can distinguish differences in photoplethysmogram signal arising under noise exposure. Additionally, the translation error was less dependent on the subject than the frequency ratio, which may make it useful index for application to real-time health monitoring of farmers.
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Sviridova et al. (2015) conducted an observational in Healthy volunteers (n=7). Tractor noise (low, medium, and high engine speeds) vs. Background noise (<43 dBA) was evaluated on Differences in cardiovascular system performance measured by Wayland test translation error (WTE) and LF/HF ratio from PPG signal (p=0.001). Exposure to tractor noise significantly altered cardiovascular system performance as detected by photoplethysmogram, with the Wayland test translation error reliably distinguishing between background and noisy conditions (p=0.001).