Have you ever wondered what the health impact of a stressful day was? Will you perform well during your long run tomorrow morning? #Heart rate variability may be the piece of data that could help you answer these questions: https://t.co/DJKjsSlKv2 #HarvardHealth pic.twitter.com/3E1vKiLjDj

— Harvard Health (@HarvardHealth) January 20, 2022