Motocross is one of the most popular high-speed motorcycle races, which takes place on a naturally closed track with significant challenges. This study aimed to characterize anthropometric, circulatory, and lower and upper limb muscle properties based on laboratory and race-recorded characteristics. Male competitors (n = 3) aged 14 years (MX) were included in the study. All three boys have national and international experience. Metabolic characteristics (ventilation, oxygen consumption, and carbon dioxide production) and heart rate (HR) were measured in the laboratory while HR and speed were measured while racing. No significant difference was found between the three competitors in terms of HR during the race. In terms of number of sprints (No. sprint) and maximum speed (Speedmax), we found the most successful runner (highest finisher) to have the most sprints and maximum speed. Comparing the metabolic characteristics, it was found that racing was between the respiratory breakpoint (VT₁) and the respiratory compensation point (RCP), but, in several cases, crossed the anaerobic threshold. While motocross riders are exposed to extreme conditions and high physical demands, in motorsport, victories depend not only on the athlete’s physical abilities but also on several factors such as driving technique, mental effort, equipment efficiency and resistance, race strategy, and team competence.

Many amateur and professional players start racing at an early age. The aim is to explore the characteristics of heart rate and speed patterns recorded during competition. We investigated the body composition and cardiorespiratory characteristics of three elite adolescent athletes, their heart rate, and speed patterns in the laboratory and competition. There is no difference between the three riders' anthropometric and body composition values, except for training age (TA), where rider (b) started riding three years ago. The intra-race heart rate patterns of the three riders showed similarities in several places and differences in several places. This was also true for the speed patterns. The differences between races were more pronounced in the heart rate pattern.