Here’s what HRV is, how it works and what can cause it to rise or fall.
Daryl Austin is a Wellness Contributor at USA TODAY. He specializes in health and wellness topics, including diet and nutrition, fitness, mental health, and consumer health, with his work also exploring the intersection of culture and society. Daryl's insights and articles have been featured in prominent publications such as National Geographic, Newsweek, and The New York Times.













