Study: Melatonin May Reduce Blood Pressure
Research published in the journal Current Aging Science suggests that melatonin may reduce blood pressure and help improve circadian rhythms in older people.
Over the span of three weeks, 63 people with a mean age of 80 participated in the Russian study.
During the first week, control data were collected. During the second week, the seniors were given a low dose of melatonin (1.5 mg) each night at 10:30 p.m. On the third week, they were monitored again.
The melatonin significantly reduced blood pressure. The maximum systolic BP lowering effect of melatonin fell between 3:00 and 8:00 in the morning, the time of the highest risk of heart attacks and strokes.
Moreover, the higher the mean systolic BP was during the first week, the more it dropped on the second week when the participants took melatonin.
Melatonin was also shown to be effective in synchronizing disrupted circadian rhythms of BP, heart rate and body temperature, making these circadian rhythms smoother and less irregular.
None of these effects was found in 34 placebo treated seniors, ruling out the possibility that rhythms could be improved just because of regular schedule and presence of medical personal who took measurements.