This study will be a cross sectional assessment of physical activity as measured through accelerometers and its association with endothelial function of children with Fontan circulation and healthy age and gender matched controls who are followed at the University of Alberta - Stollery Children's hospital.
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Physical activity measured by accelerometers
Timeframe: Once consent/assent is obtained, participants will be asked to wear an Actigraph GT3X+ accelerometers for seven consecutive days, during waking hours.
Endothelial function measured by Digital Thermal Monitoring (DTM) via the automated, operator-independent protocol (VENDYS-6000, Endothelix Inc., Houston, TX) and the Endothelial Pulse Amplitude Test (Endo-PAT, Itamar Medical).
Timeframe: Once consent/assent is obtained, endothelial function will be measured one time during a routine clinical visit.