Table 2.

Change in peak exercise performance from Fontan I to Fontan III

Characteristic	N	Fontan I	Fontan III	Annualized change	p value*
Age at exercise testing	95	13.7 ± 2.8	23.1 ± 2.9		<0.001
Peak VO2, mL/kg/min	95	28.1 ± 6.2	26.6 ± 7.5	−0.2 ± 0.7	0.03
% predicted VO2	95	68.5 ± 14.3	61.4 ± 15.9	−0.8 ± 1.7	<0.001
Peak work rate, W	95	101.1 ± 40.2	128.2 ± 39.2	2.9 ± 4.6	<0.001
% predicted peak work rate	95	68.7 ± 15.4	55.6 ± 15.9	−1.4 ± 1.6	<0.001
Maximum respiratory rate	95	52.6 ± 12.3	45.9 ± 10.7	−0.7 ± 1.2	<0.001
Peak heart rate	95	161.0 ± 20.5	153.3 ± 23.7	−0.8 ± 2.1	<0.001
% predicted peak heart rate	95	78.0 ± 9.8	77.8 ± 11.9	−0.0 ± 1.0	0.85
Resting O2 saturation	94	94.1 ± 4.2	93.2 ± 4.4	−0.1 ± 0.4	0.03
Peak O2 saturation	89	91.4 ± 5.0	90.7 ± 4.4	−0.1 ± 0.5	0.13

VO₂ oxygen consumption, W Watts, O₂ oxygen

^*Paired Student’s t test