Journal of Sports Science and Medicine
Journal of Sports Science and Medicine
ISSN: 1303 - 2968   
Ios-APP Journal of Sports Science and Medicine
Androit-APP Journal of Sports Science and Medicine
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from September 2014
 
©Journal of Sports Science and Medicine ( 2014 ) 13 , 97 - 104

Research article
Does a Non-Circular Chainring Improve Performance in the Bicycle Motocross Cycling Start Sprint?
Manuel Mateo-March1,2, , Eneko Fernández-Peña3, Cristina Blasco-Lafarga4, Jaime Morente-Sánchez1,5, Mikel Zabala1,5
Author Information
1 Spanish Cycling Federation, Madrid, Spain
2 Miguel Hernandez University of Elche, Alicante, Spain
3 Department of Physical Education and Sport, University of the Basque Country UPV/EHU, Basque Country, Spain
4 Faculty of Physical Activity and Sport Sciences, University of Valencia, Spain
5 Faculty of Sport Sciences, University of Granada, Spain

Manuel Mateo-March
✉ c/ San Isidro, 10. Entresuelo A. San Vicente del Raspeig, Alicante, 03690, Spain
Email: manuel.mateo@ymail.com
Publish Date
Received: 14-05-2013
Accepted: 27-09-2013
Published (online): 20-01-2014
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ABSTRACT

Maximising power output during the initial acceleration phase of a bicycle motocross (BMX) race increases the chance to lead the group for the rest of the race. The purpose of this study was to investigate the effect of non-circular chainrings (Q-ring) on performance during the initial acceleration phase of a BMX race. Sixteen male cyclists (Spanish National BMX team) performed two counterbalanced and randomized initial sprints (3.95s), using Q- ring vs. circular chainring, on a BMX track. The sample was divided into two different groups according to their performance (Elite; n = 8 vs. Cadet; n = 8). Elite group covered a greater distance using Q-ring (+0.26 m, p = 0.02; D = 0.23), whilst the improvement for the Cadet (+0.04 m) was not significant (p = 0.87; D = -0.02). Also, there was no significant difference in power output for the Elite group, while the Cadet group revealed larger peak power with the circular chainring. Neither lactate level, nor heart rate showed significant differences due to the different chainring used. The non-circular chainring improved the initial acceleration capacity only in the Elite riders.

Key words: Power, efficiency, pedalling, biomechanics, lactate


           Key Points
  • This work provides novel results demonstrating very significant improvements in the sprint performance of BMX cycling discipline using a non-circular chainring system.
  • This study seeks a practical application from scientific analysis
  • All data are obtained in a real context of high competition using a sample comprised by the National Spanish Team.
  • Some variables influencing performance as subjects’ physical fitness are discussed.
  • Technical equipment approved by International Cycling Union is studied to check its potentially beneficial influence on performance.
 
 
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