The impact of altered task mechanics on timing and duration of eccentric bi-articular muscle contractions during cycling

Connick, Mark J. and Li, François-Xavier (2012) The impact of altered task mechanics on timing and duration of eccentric bi-articular muscle contractions during cycling. Journal of Electromyography and Kinesiology, 23 1: 223-229. doi:10.1016/j.jelekin.2012.08.012


Author Connick, Mark J.
Li, François-Xavier
Title The impact of altered task mechanics on timing and duration of eccentric bi-articular muscle contractions during cycling
Journal name Journal of Electromyography and Kinesiology   Check publisher's open access policy
ISSN 1050-6411
1873-5711
Publication date 2012-09-22
Sub-type Article (original research)
DOI 10.1016/j.jelekin.2012.08.012
Volume 23
Issue 1
Start page 223
End page 229
Total pages 7
Place of publication London, United Kingdom
Publisher Elsevier
Collection year 2013
Language eng
Abstract In order to understand muscle adaptations to altered task mechanics during cycling, this study investigated the impact of altered seat height and cadence on timing and duration of gastrocnemius (GAST), biceps femoris (BF) and vastus lateralis (VL) eccentric contractions and muscle activation patterns, and cycling economy. Ten male cyclists completed 9 × 5 min of cycling at 3 seat heights and 3 cadences. Three-dimensional leg kinematics and muscle activation patterns were recorded to estimate timing of eccentric muscle contractions. Onset, offset and duration of eccentric contractions and, onset, offset and duration of muscle activation were calculated, along with cycling economy. Duration of GAST and VL eccentric contractions decreased with increasing seat height due to earlier offset of eccentric muscle contractions. Duration of BF eccentric contractions significantly increased with seat height due to a later eccentric contraction offset. Offset of GAST and BF muscle activation occurred earlier with increasing cadence. Cycling economy was significantly affected by cadence but not seat height. The results suggest that as a consequence of altered seat height, proprioceptive feedback is used to fine-tune the timing of bi-articular eccentric muscle contractions. These results may have implications for seat height self-selection.
Keyword Cadence
Concentric
Coordination
EMG
Kinematics
Pedalling
Seat height
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Available online: 23 September 2012.

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2013 Collection
School of Human Movement and Nutrition Sciences Publications
 
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Created: Mon, 19 Nov 2012, 11:08:21 EST by Deborah Noon on behalf of School of Human Movement and Nutrition Sciences