Vibha Bhat, Prashanth Shetty, Shashikiran H. C.*, Sujatha K. J. and Prajna Amruth


Background: Hypertension is one of the leading causes of coronary heart disease. Our body is exposed to various sources of coloured lights in the contemporary life environments, which may affect our physiological functions and psychological status. In this study we examined the impacts of blue coloured light on autonomic functions by the analysis of heart rate variability on primary hypertensive. Methods: Two square shaped LED panel lights of blue colour which was having the size of 170× 170mm, power of 12watts and voltage of 260 volts were used in this study. The lights were secured 90cm above the eyes of the subject lying supine in light- shielded research laboratory in day time. After 5min of supine rest, the pre data of autonomic variables like Heart rate, respiratory rate, blood pressure and pulse rate were measured in the well ventilated and naturally illuminated room. The data were collected after 30min of exposure to blue light. Results: There is significant difference between average breaths taken per minute by the patients Pre and post treatment. And we also observe there is significance difference between the pairs of Pre SBP – Post SBP, Pre DBP – Post DBP and Pre Pulse – Post Pulse, p<0.05. In the remaining cases there is no enough evidence to conclude the significant difference between their pairs. Conclusion: Vagal cardiac modulation is suppressed by blue coloured illumination in patients with primary hypertension. This study suggests that, we need to consider the difference in physiological effects with blue colour illumination.

Keywords: Primary Hypertension, Blue coloured light, Heart rate variability.

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