TY - JOUR T1 - Why does the heart rate response to exercise predict adverse cardiac events? JF - Heart JO - Heart SP - 577 LP - 578 DO - 10.1136/hrt.2005.079400 VL - 92 IS - 5 AU - H C Routledge AU - J N Townend Y1 - 2006/05/01 UR - http://heart.bmj.com/content/92/5/577.abstract N2 - The physiological mechanisms responsible for determining heart rate during exercise are complex, and further research into “chronotropic incompetence” is clearly required ER -