Physical activity is associated with improved aerobic exercise capacity over time in adults with congenital heart disease

Background: Impaired exercise capacity is common in adults with congenital heart disease (ACHD). This impairment is progressive and is associatedwith increasedmorbidity andmortality. We studied the influence of the frequency of at least moderately strenuous physical activity (PhysAct) on changes in exercise capacity of ACHD patients over time. Methods: We studied ACHD patients >= 21 years old who had repeated maximal (RER >= 1.09) cardiopulmonary exercise tests within 6 to 24 months. On the basis of data extracted from each patient's clinical records, PhysAct frequency was classified as (1) Low: minimal PhysAct, (2) Occasional: moderate PhysAct <2 times/week, or (3) Frequent: moderate PhysAct >= 2 times/week. Results: PhysAct frequency could be classified for 146 patients. Those who participated in frequent exercise tended to have improved pVO(2) (Delta pVO(2) = + 1.63 +/- 2.67 ml/kg/min) compared to those who had low or occasional activity frequency (Delta pVO(2) = + 0.06 +/- 2.13 ml/kg/min, p = 0.003) over a median follow-up of 13.2 months. This differencewas independent of baseline clinical characteristics, time between tests, medication changes, orweight change. Thosewho engaged in frequent PhysActweremore likely to have an increase of pVO(2) of = 1SD between tests as compared with sedentary patients (multivariable OR = 7.4, 95% CI 1.5-35.7). Aerobic exercise capacity also increased for patients who increased activity frequency from baseline to follow-up; 27.3% of those who increased their frequency of moderately strenuous physical activity had a clinically significant (at least+ 1SD) increase in pVO2 compared to only 11% of thosewhomaintained or decreased activity frequency. Conclusions: ACHD patients who engage in frequent physical activity tend to have improved exercise capacity over time. (C) 2013 Elsevier Ireland Ltd. All rights reserved.