Long-term Antihypertensive Effects of Far-infrared Ray Irradiated from Wooden Board in Spontaneously Hypertensive Rats
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Background: Far-infrared ray (FIR) has been widely used in promoting health and has been shown to exert beneficial effects in vascular function. The non-thermal effect of FIR has been found to play a significant role in the protective effect on some vascular-related diseases, but its protective effects and use against hypertension have not been clearly presented.
Methods: In the present study, by using a wooden board coated with FIR-irradiated materials, we evaluated the long-term antihypertensive effect on spontaneously hypertensive rats (SHRs) in the environment in contact with the FIR-irradiated wooden board. SHRs were placed on the wooden board with or without FIR radiation for 4 weeks.
Results: The systolic blood pressure (BP) of SHRs undergoing different treatments was measured weekly using a tail-cuff method. FIR radiation significantly reduced the systolic BP of the SHRs along with a decreasing plasma level of angiotensin II and an increasing plasma level of bradykinin. In addition, long-term contact of FIR did not significantly affect the BP in normotensive Wistar Kyoto rats (WKYs).
Conclusions: Our results provided the evidence based on which FIR radiation could be considered an effective non-pharmacological choice for preventing hypertension.
Kim S, Lee I, Song H, Choi S, Nagar H, Kim S Evid Based Complement Alternat Med. 2019; 2019:1813282.
PMID: 31781259 PMC: 6875339. DOI: 10.1155/2019/1813282.