Physiological Responses of Mountain Bikers Using Different Bicycle Suspension Systems on a Simulated Race Course

Abstract

One of the most popular advances in mountain bike technology is the development of dual suspension systems - suspension for both the front and back wheels. While people in the sport believe suspension systems have a physiological performance enhancing effect, there is little research on the efficacy of dual suspension for competition settings. PURPOSE: To investigate the physiological responses of competitive male and female mountain bikers riding mountain bikes with front and dual suspension systems on terrain similar to mountain bike cross-country race courses. METHODS: 11 competitive male and female mountain bikers (27 ±7.3 y, 76.1±8.3 kg, 182.2±8.2 cm) were fitted to ride a mountain bike on a 355 m loop with 38 fixed log bumps, averaging 9 cm in diameter, during three randomly assigned trials: no-suspension (NS), front suspension (FS), and dual suspension (DS). Four controlled speed (4.5 m*s−1) laps were completed, followed by 6 race intensity laps. During each trial, heart rate (HR) and oxygen consumption (VO2) were collected using a portable metabolic system. Rating of perceived exertion (RPE) was collected once per lap. Vertical accelerations were determined by using accelerometers attached to the bicycle. RESULTS: There were no significant differences in HR, VO2, or average speed with the use of the three suspension systems during the controlled pace and race intensity laps. RPE was significantly less while riding the DS and FS bikes compared to the NS bike, however there were no differences between DS and FS. The vertical motion of the rider and the bike was significantly less with the DS system. Rider/suspension system interactions did have significant effects on heart rate, oxygen consumption, and average speed. CONCLUSOON: These data support the findings of previous studies in that the use of mountain bike suspension does not have a significant effect on HR, VO2, and average speed, despite the visually-anticipated benefits. There is evidence showing that there is less vertical movement of the bike/rider system while riding with dual suspension, which may enhance control of the bicycle and decrease the rider's feelings of exertion.