Key result
Exposure to shorter wavelength light (blue and green) significantly decreased heart rate and perfusion index while increasing heart rate variability, whereas red light had the opposite effect.
Why the study?
Does exposure to different wavelengths of light affect heart rate, heart rate variability, and perfusion index in human participants?
Does exposure to different wavelengths of light affect heart rate, heart rate variability, and perfusion index in human participants?
Different wavelengths of light elicit distinct autonomic physiological responses, with shorter wavelengths (blue, green) decreasing heart rate and increasing heart rate variability, while longer wavelengths (red) have the opposite effect.
Shorter-wavelength light may alter autonomic parameters during monitoring; leaves open whether this extends to cardiovascular outcomes.
Light influences on our physical, mental and emotional health. It can suppress or stimulate physiological responses in human beings, the extent of which depends on the wavelength, duration and intensity of light exposure. The study was designed to investigate the impact of different colored illumination, using non-invasive means on the heart rate variability and perfusion index. Electrocardiogram (ECG) and pulse oximetry are non-invasive recording of the cardiac activity. Thus, this paper reports experimental research conducted where changes in heart rate (HR), Heart rate variability (HRV)through ECG and perfusion index (PI) via pulse oximetry were measured when the participants were exposed to different wavelength of light (Blue, Red, and Green). The results of these experiments show that there is a change in heart rate, variability and perfusion index when a subject is exposed to different wavelengths. There was a decrease in HR and PI after the exposure, significantly for blue (p<;0.0001, p<; 0.0002) and green (p<;0.0098, p<; 0.0150) (shorter wavelength) color, while significant increase in HRV (blue (p<;0.0001), green (p<; 0.0451)). The case was opposite for red color.
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Fatima et al. (2018) studied this question. Different wavelengths of light (Blue, Red, Green) was evaluated on Changes in heart rate (HR), heart rate variability (HRV), and perfusion index (PI) (p=<0.0001). Exposure to shorter wavelength light (blue and green) significantly decreased heart rate and perfusion index while increasing heart rate variability, whereas red light had the opposite effect.
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