Citation

Herrick JE, Flohr JA, Wenos DL, Saunders MJ. Int. J. Sports Physiol. Perform. 2014; ePub(ePub): ePub.

Affiliation

Department of Kinesiology and Health Education, Southern Illinois University Edwardsville, Edwardsville, Illinois.

Copyright

(Copyright © 2014, Human Kinetics Publishers)

DOI

unavailable

PMID

21941014

Abstract

PURPOSE: This study compared the metabolic and performance effects of riding front only suspension (FS) and front-and-rear suspension (FRS) mountain bicycles on an offroad course that simulated competitive cross-country race conditions (>105 min duration, with ~70% of time spent riding uphill). METHOD: Seven competitive mountain bikers (73.8±7.6 kg; 61.0±4.3 mL·kg-1·min-1) completed two randomized FS and FRS trials. Bikes were similar, excluding rear wheel suspension on the FRS, which increased bike weight by ~2 kg. Each trial consisted of four laps of rugged 8km trail with 154m of elevation gain per lap. The first three laps were performed at ~70% of VO2max; VO2, HR, and RPE were collected during the first and third laps. The final lap was performed as a maximal time-trial effort. RESULTS: During the first and third laps, VO2, HR, and RPE were similar between FS and FRS. However, FS was significantly faster than FRS during the ascending segment of the course (17.6±2.9 vs. 18.9±3.4 min, p=0.035), despite similar VO2 (p=0.651). Although not statistically significant, FRS tended to be faster than FS during the descending portion of the course (8.1±2.0 vs. 9.1±2.1, p=0.067) at similar VO2. Performance during the final time-trial lap was significantly faster for FS than FRS (24.9±3.9 min, 27.5±4.9 min, p=0.008). CONCLUSION: FS was faster than FRS over a course that simulated competitive cross-country race conditions. The faster times were likely the result of improved cycling economy during ascending, which were at least partially influenced by the lighter weight of the FS.

Language: en