There are currently no published data describing the kinetics of the heart rate (HR) response during frontside and backside wave riding on a surfboard, or for wave riding bouts longer than 15 seconds. The purpose of this study was to characterize the HR response of surfers performing frontside and backside wave riding in an artificial wave pool that allowed surfers to ride waves for up to 60 seconds. It was hypothesized that HR response would differ between the two surfing orientations, because their levels of complexity are perceived to be different by surfers. Twenty male (n=17) and female (n=3) junior professional athletes (14.7 ± 1.2 years old) participated in this study. Following parental consent, participants completed a questionnaire and were instrumented with a HR monitor (Polar RCX5 Sports Watch), which recorded HR at 1-second intervals. Researchers initiated HR sampling prior to surfer participation in a one-hour surf session in an artificial wave pool (Kelly Slater Wave Co) and synchronized HR with video recordings of wave riding. Seven subjects that did not ride at least one frontside and backside wave were excluded from the analysis. The average duration of the wave ride was 33.2 ± 8.4 seconds. Average and peak HR while wave riding was 174.1 ± 12.6 and 184.9 ±13.0 bpm, respectively. There were no significant differences in HR response or wave riding duration between frontside and backside directions. These results provide insight into the cardiovascular requirements of wave riding in an artificial wave pool.