Impact of School-Based Interval Training on Adolescent Aerobic Capacity

The decline in physical activity among adolescents increases cardiometabolic risks; in school contexts, the low intensity of classes limits improvements in aerobic capacity, highlighting the need for effective training strategies. The objective of the study was to determine the impact of an interval training program implemented in regular Physical Education classes on adolescents' aerobic capacity through a quasi-experimental design with a control group. A quantitative quasi-experimental study with a pretest–posttest design and control group was conducted; 48 adolescents participated. An interval training program was implemented for eight weeks, and aerobic capacity was assessed using the Course Navette test. The experimental group showed a significant increase in VO₂max after eight weeks of interval training, while the control group maintained similar values; statistical analyses revealed significant improvements in aerobic capacity. Interval training applied in school sports contexts improves adolescents’ aerobic capacity and optimizes training time, constituting an effective strategy to strengthen physical fitness and promote active habits.