RT Journal
A1 Peteiro J, Bouzas-Mosquera A
T1 EXercise capacity and left ventricular function
JF JAMA
JO JAMA
YR 2009
FD June 10
VO 301
IS 22
SP 2325
OP 2327
DO 10.1001/jama.2009.696
UL http://dx.doi.org/10.1001/jama.2009.696
AB 
First, the measurement of E/e′ at 2 to 7 minutes after cessation of exercise may not be reliable because recovery of heart rate, and therefore recovery of left ventricular diastolic function and filling pressures, may occur within 1 to 2 minutes after exercise for most patients.2 In other studies this parameter has been measured at peak exercise3 or within 1 minute after exercise.4 The merging of early and late diastolic waves either at the left ventricular inflow level or mitral annulus should be not considered an impediment because the usefulness of the 
E/e′ index has been demonstrated even in this condition.5