A new study using data from Whoop’s wearable found that exercising within four hours of bedtime can compromise sleep quality
Exercise has long been championed as a key component to better health and sleep, but new research using data from Whoop shows that intense or workouts within four hours of bedtime can disrupt sleep quality.
Using data from 14,689 physically active individuals who sported Whoop’s biometric wearable band over the course of a year, researchers found that exercising later in the evening and higher workout strain was linked to delayed sleep onset, shorter sleep duration and experiencing lower sleep quality. The researchers also observed higher nocturnal resting heart rate and decreased heart rate variability following a high-strain workout in the evening.
The findings—published in Nature Communications by collaborators at Monash and Harvard—suggest that wellness seekers may benefit from finishing workouts four hours before bedtime or opting for lower-intensity sessions to support sleep quality. Similarly, those who prefer intense workouts might consider scheduling their strenuous fitness sessions at least four hours before bedtime.
“If you’re training hard but not sleeping well, when you work out may matter just as much as how you work out,” Whoop founder and CEO Will Ahmed shared on LinkedIn. “This is one of the largest studies ever published on exercise and sleep—and it’s only possible because of continuous Whoop data and our commitment to research that improves human performance.”
Beyond its relevance for fitness enthusiasts, the study’s findings could meaningfully guide individuals struggling with sleep issues.
“Our novel and timely findings have significant implications for public health messaging around timing, duration and intensity of exercise and present a critical step towards improving population sleep health—an issue of central importance given two in three Australian adults report at least one sleep problem and one in five adults fail to achieve the recommended seven or more hours of sleep per night,” Dr. Elise R. Facer-Childs, one of the study’s authors, said.
The Boston-based human performance company is no stranger to scientific studies or collaborations that advance health and wellness. It has recently partnered with Solidcore to track the strain and intensity of the boutique fitness brand’s Reformer-based workouts.