Measuring the human psychophysiological conditions without contact

24th A.I.VE.LA. Annual Meeting

Scalise, L.^1 ; Casacanditella, L.^1 ; Cosoli, G.^1

Department of Industrial Engineering and Mathematical Sciences, Università Politecnica Delle Marche, via Brecce Bianche, Ancona

60033, Italy^1

关键词: Autonomic regulation;    Frequency domains;    Heart rate variability;    Laser Doppler vibrometers;    Laser Doppler Vibrometry;    Non contact devices;    Physical stressors;    Time and frequency domains;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/882/1/012016/pdf
DOI  :  10.1088/1742-6596/882/1/012016

来源: IOP

【 摘 要 】

Heart Rate Variability, HRV, studies the variations of cardiac rhythm caused by the autonomic regulation. HRV analysis can be applied to the study of the effects of mental or physical stressors on the psychophysiological conditions. The present work is a pilot study performed on a 23-year-old healthy subject. The measurement of HRV was performed by means of two sensors, that is an electrocardiograph and a Laser Doppler Vibrometer, which is a non-contact device able to detect the skin vibrations related to the cardiac activity. The present study aims to evaluate the effects of a physical task on HRV parameters (in both time and frequency domain), and consequently on the autonomic regulation, and the capability of Laser Doppler Vibrometry in correctly detecting the effects of stress on the Heart Variability. The results show a significant reduction of HRV parameters caused by the execution of the physical task (i.e. variations of 25-40% for parameters in time domain, also higher in frequency domain); this is consistent with the fact that stress causes a reduced capability of the organism in varying the Heart Rate (and, consequently, a limited HRV). LDV was able to correctly detect this phenomenon in the time domain, while the parameters in the frequency domain show significant deviations with respect to the gold standard technique (i.e. ECG). This may be due to the movement artefacts that have consistently modified the shape of the vibration signal measured by means of LDV, after having performed the physical task. In the future, in order to avoid this drawback, the LDV technique could be used to evaluate the effects of a mental task on HRV signals (i.e. the evaluation of mental stress).