- This study will use a COSMED K5 portable metabolic unit to expand on the limited knowledge of the energy demands of top rope rock climbing. Participants will be experienced, consistent rock climbers. Two route difficulties (5.8 and 5.10) will be analyzed using a repeated measures randomized design to determine differences in metabolic stress between each route. In addition, muscle (forearm) fatigue will be measured using a handheld dynamometer before and after each climb. Male and female athletes during pilot testing expended between 127 and 156 calories during the testing protocol. Rock climbing appears to utilize both the aerobic and anaerobic energy pathways and utilize carbohydrates and fats for energy. The results of this study, once completed, will benefit physiologists, athletes, and coaches who want to optimize training adaptations for rock climbing. This knowledge will be a benefit those who seek to create appropriate nutrition protocols for athletes performing long duration/repeated climbs.