IRCT2014051217669N1 IRCT 2014-06-23 Vice chancellor for research, Babol University of Medical Sciences. The effect of ambient lighting in preterm infant Effect of ambient lighting on heart rate and blood oxygen saturation in preterm infant admitted to neonatal intensive care unit in Babol, Iran 2013-12-22 anticipated 40 Complete https://irct.ir/trial/16189 interventional Randomization: N/A, Blinding: Not blinded, Placebo: Not used, Assignment: Other, Purpose: Supportive. N/A Effect of ambient lighting on heart rate and blood oxygen saturation in preterm infant. In this study, gestational age was calculated by Ballard scale and intensity of brightness in the NICU through a device called a luxury meter with 3% ± confidence level in Taiwan, heart rate and oxygen saturation percentage in preterm infants by Saadat monitor, made in Iran was measured. In order to record data on the monitor, we use the probe including a light detector, put against each other and also the tissue layers (fingers of hand or foot) and also between them. In order to get demographic information, we use birth records after attracting personnel and explaining to the parents and getting consent from them. According to selected Infants at the same time from 12:00 to 13:00 on a routine part, amount of brightness have been estimated and recorded by luxury meter and then we record heart rate and arterial oxygen saturation percentage displayed on the monitor every 5 minutes. On the same day, on the same infant from 14:30 to 15:30, amount of brightness through controlling light by covering the incubator and putting the cover on the window with the blinds and turning off non-essential lights reached 10 luxuries and then we record their effect on heart rate and arterial oxygen saturation percentage every 5 minutes during the intervention..