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Does a non-circular chainring improve performance in the bicycle motocross cycling start sprint?

Authors :
Educación física y deportiva
Gorputz eta Kirol Hezkuntza
Mateo March, Manuel
Fernández Peña, Eneko
Blasco Lafarga, Cristina
Morente Sánchez, Jaime
Zabala, MIkel
Educación física y deportiva
Gorputz eta Kirol Hezkuntza
Mateo March, Manuel
Fernández Peña, Eneko
Blasco Lafarga, Cristina
Morente Sánchez, Jaime
Zabala, MIkel
Publication Year :
2014

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.

Details

Database :
OAIster
Notes :
English
Publication Type :
Electronic Resource
Accession number :
edsoai.on1430742019
Document Type :
Electronic Resource