It’s long been understood that the human body undergoes hormonal changes throughout the course of a circadian cycle.
“We know a lot of things that do change from hour to hour. Some hormones change reliably. Everybody has a built-in body clock,” Dr. Steven Feinsilver, director of sleep medicine at Lenox Hill Hospital in New York, told Healthline.
“It affects a lot more than just sleep. Lots of hormones change by the clock. Growth hormone is produced in the middle of the night while cortisol is produced in the early morning,” he said.
Based off this, Feinsilver says it makes sense that certain times of day might work better than others for meeting specific exercise goals.
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