Standardization of a Continuous Ramp Ergometer Protocol for Clinical Exercise Testing in Children

Developing a standardized protocol for pediatric exercise laboratories is challenging. Our objective was to report normal pediatric values for a continuous non-steady state cycle ergometer ramp protocol to achieve 8-10 min of exercise based on sex and weight. One hundred seventeen patients (117) [mean age 13 ± 2.8 years, range 7-18 years (51% male)] referred for chest pain with normal cardiac evaluation underwent cardiopulmonary testing on a cycle ergometer. Patients entered one of the four continuous ramp protocols (10, 15, 20, and 25 W/min ramp) to achieve an expected peak workload of 3 W/kg at an increase of 0.3 to 0.35 W/kg/min. Exercise test outcomes measured included duration, peak heart rate, work, respiratory exchange ratio, peak oxygen consumption, peak blood pressure, and ventilatory anaerobic threshold. An exercise duration of 8-10 min was achieved in a majority of the study population; however, interactions with age (older, longer duration) and sex (males, longer duration) were present. Using our algorithm (0.3-0.35 W/kg × weight), we demonstrated four non-steady state ramp bike ergometer protocols (10, 15, 20, and 25 W/min) that can be applied to males and females of different ages and weights to achieve an exercise duration of 8-10 min.