n International SportMed Journal - Lower limb muscle activation during a 40km cycling time trial : co-activation and pedalling technique : original research article
|Article Title||Lower limb muscle activation during a 40km cycling time trial : co-activation and pedalling technique : original research article|
|© Publisher:||International Federation of Sports Medicine|
|Journal||International SportMed Journal|
|Author||Rodrigo Rico Bini, Fernando Diefenthaeler and Felipe P. Carpes|
|Publication Date||Mar 2011|
|Pages||7 - 16|
|Keyword(s)||Activation variability, AUT University, New Zealand, Cycling performance, Electromyography, Muscle fatigue, Muscle recruitment, Universidade Federal do Pampa, Brazil and Universidade Federal do Rio Grande do Sul|
Background: Knee extensors muscle activation could be optimized by a reduced activation of knee joint flexor muscles (co-activation) during fatigue. Time trial events are based on the management of energy resources by controlling muscle activation by focusing on optimizing performance and avoiding premature fatigue. Research question: Is there a reduction on muscle co-activation and variability of muscle activity during the recovery phase of pedal cycle which could influence pedalling technique and time trial performance? Type of study: Cross-sectional. Methods:Subjects: Eight triathletes. Experimental procedure: Maximal oxygen uptake and power output evaluation session. Cycling time trial performance session with the measurement of muscle activity by means of electromyography. Outcome measurements: Knee and ankle muscle co-activation, muscle activation variability, and muscle activation during the recovery phase of a pedal cycle. Results: Increased variability of biceps femoris and increased recruitment of vastus lateralis at the end of the time trial. No differences found for muscle co-activation. Conclusion: Individual strategies regarding biceps femoris activation are suggested based on changes in muscle activation variability. Vastus lateralis showed increased activation during the recovery phase, probably as an attempt to improve power output in the propulsion phase.
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