Table 2.

Baseline and Exercise Characteristics of Subjects Off Medication Based on Percent Heart Rate Reserve (Index ETT).

Variable	HR Reserve <80% (n=5)	HR Reserve ≥ 80% (n=9)	p Value
age	9.8 ± 1.4	13.2 ± 1.2	0.10
Exercise duration (sec)	361.8 ± 98.3	754.9 ± 62.6	0.0041
METS achieved	4.9 ± 1.3	13.4 ± 1.4	0.0018
HR at rest (beats/min)	69.4 ± 3.9	73.6 ± 5.1	0.59
HR at peak exercise (beats/min)	161.2 ± 5.4	197.8 ± 3.3	<0.0001
Blood Pressure (mm Hg)
Systolic Blood Pressure at rest	109.0 ± 3.3	110.2 ± 4.3	0.85
Diastolic Blood Pressure at rest	65.0 ± 2.9	73.2 ± 2.2	0.045
Peak Systolic Blood Pressure	133.4 ± 9.7	169.4 ± 10.3	0.041
Delta Systolic Blood Pressure (peak-rest)	24.4 ± 7.9	59.2 ± 10.7	0.047
Ventricular Arrhythmia Score	3.4 ± 0.6	1.6 ± 0.5	0.046

Abbreviations: HR, heart rate; METS, metabolic equivalents; min, minute; mm Hg, millimetre of mercury; sec, second.