"Wrist-worn heart rate monitors less accurate than standard chest strap Wrist-worn heart rate..."

“Wrist-worn heart rate monitors less accurate than standard chest strap Wrist-worn heart rate monitors less accurate than standard chest strap”

- https://www.sciencedaily.com/releases/2017/03/170308145327.htm

source http://physiquesportsuk.tumblr.com/post/158239280964