E1 Popularised article

Active Voice: HIIT the Heart – Short-Term HIIT Improves Cardiac Autonomic Function

Authors: Antti M. Kiviniemi, Kari K. Kalliokoski

Publisher: American College of Sports Medicine

Publication year: 2015

Journal: Sports Medicine Bulletin

Issue: March 31

Web address : http://www.multibriefs.com/briefs/acsm/active3-31.htm