Effect of Short-term Sunlight Exposure on Blood Pressure and Pulse Rate in Vitamin D3 Insufficient, Prehypertensive Patients

The weather was sunny and found suitable for outside activity and sunlight exposure program, with a mean temperature of 27.0-28.5 °C, the humidity of 64-80%, and global solar exposure of 1.28 to 2.99 MJ/m2 during treatment.\[15\] Participants were asked to lie on the beach for 45 minutes per day between 2 to 3 pm to avoid extreme skin irritation and sunburn from direct sunlight exposure.