Protective effect of light emitting diode phototherapy on fluorescent light induced retinal damage in Wistar strain albino rats.

Background: Artificial light at night alters retinal physiology. Several studies have shown that light emitting diode phototherapy protects the retina from the damaging effects of acute light exposure.

Objective: The aim of this study has been to elucidate the protective effects of 670 nm LED light on retinal damage induced by chronic fluorescent light in Wistar rats.

Impact of acute respiratory stress on cardiac autonomic control in young healthy subjects explored by time and frequency domain methods.

To find the possible utility of analysis of heart rate variability in quantifying transient cardiac autonomic modulation, we assessed the impact of breath holding-induced acute respiratory stress on heart rate variability parameters and blood pressure in young healthy subjects. In ten healthy subjects aged between 22-24 years of either sex, R-R intervals and blood pressure were recorded for one minute under resting state, during breath holding and immediately after withdrawal from breath holding. Heart rate variability was quantified by time and frequency domain methods.