Men who had early puberty at higher risk of type 2 diabetes
Chawla and his team analyzed data collected via Fitbit from 557 college students over the course of four years. They recorded 255,736 sleep sessions -; measuring bedtimes, sleep and resting heart rate. Significant increases in RHR were observed when individuals went to bed anywhere between one and 30 minutes later than their normal bedtime. Normal bedtime was defined as the one-hour interval surrounding a person's median bedtime. The later they went to bed, the higher the increase in RHR. Rates remained elevated into the following day.
Surprisingly, going to bed earlier than one's standard bedtime also showed signs of increasing RHR, though it depended on just how early. Going to bed 30 minutes earlier than usual appeared to have little effect, while going to bed more than a half hour earlier significantly increased RHR. In cases of earlier bedtimes, however, RHR leveled out during the sleep session. Circadian rhythms, medications and lifestyle factors all come into play when it comes to healthy sleep habits, but Chawla said it's vital to consider consistency as well.
"For some, it may be a matter of maintaining their regular 'work week' bedtime through the weekend," said Chawla. "For shift workers and those who travel frequently, getting to bed at the same time each night is a challenge. Establishing a healthy bedtime routine -; as best you can -; is obviously step number one. But sticking to it is just as important." Source:
University of Notre Dame Journal reference:
Faust, L., et al. (2020) Deviations from normal bedtimes are associated with short-term increases in resting heart rate. npj Digital Medicine . doi.org/10.1038/s41746-020-0250-6 .
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