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Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists
Previous studies have reported improved efficiency at steeper seat tube angle (STA) during ergometer cycling; however, neuromuscular mechanisms have yet to be fully determined. The current study investigated effects of STA on lower limb EMG activity at varying exercise intensities. Cyclists (n=11) w...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Berkeley Electronic Press
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5786204/ https://www.ncbi.nlm.nih.gov/pubmed/29399245 |
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author | DUGGAN, WILL DONNE, BERNARD FLEMING, NEIL |
author_facet | DUGGAN, WILL DONNE, BERNARD FLEMING, NEIL |
author_sort | DUGGAN, WILL |
collection | PubMed |
description | Previous studies have reported improved efficiency at steeper seat tube angle (STA) during ergometer cycling; however, neuromuscular mechanisms have yet to be fully determined. The current study investigated effects of STA on lower limb EMG activity at varying exercise intensities. Cyclists (n=11) were tested at 2 workloads; 160W and an individualised workload (IWL) equivalent to lactate threshold (T(Lac)) minus 10%δ (derived from maximal incremental data), using 3 STA (70, 75 and 80°). Electromyographic data from Vastus Medialis (VM), Rectus Femoris (RF), Vastus Lateralis (VL) and Biceps Femoris (BF) were assessed. The timing and magnitude of activation were quantified and analysed using a two-way ANOVA. STA had significant (P < 0.05) effects on timing of onset and offset of VM, timing of offset of VL, and angle at peak for RF, all occurring later at 80 vs. 70° STA at IWL. In RF, increased activity occurred during the first 108° of the crank cycle at 80 vs. 70° at IWL (P < 0.01). As most of the power in the pedal stroke is generated during the mid-section of the down-stroke, movement of the activation range of knee extensors into the predominantly power phase of the pedal stroke would potentially account for increased efficiency and decreased cardio-respiratory costs. Greater activity of bi-articular RF, in the first 108º of the crank cycle at IWL (80 vs. 70º) may more closely resemble the pelvic stabilising activity of RF in running biomechanics; and potentially explain the more effective transition from cycling to running reported in triathletes using steeper STA. |
format | Online Article Text |
id | pubmed-5786204 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | Berkeley Electronic Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-57862042018-01-31 Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists DUGGAN, WILL DONNE, BERNARD FLEMING, NEIL Int J Exerc Sci Original Research Previous studies have reported improved efficiency at steeper seat tube angle (STA) during ergometer cycling; however, neuromuscular mechanisms have yet to be fully determined. The current study investigated effects of STA on lower limb EMG activity at varying exercise intensities. Cyclists (n=11) were tested at 2 workloads; 160W and an individualised workload (IWL) equivalent to lactate threshold (T(Lac)) minus 10%δ (derived from maximal incremental data), using 3 STA (70, 75 and 80°). Electromyographic data from Vastus Medialis (VM), Rectus Femoris (RF), Vastus Lateralis (VL) and Biceps Femoris (BF) were assessed. The timing and magnitude of activation were quantified and analysed using a two-way ANOVA. STA had significant (P < 0.05) effects on timing of onset and offset of VM, timing of offset of VL, and angle at peak for RF, all occurring later at 80 vs. 70° STA at IWL. In RF, increased activity occurred during the first 108° of the crank cycle at 80 vs. 70° at IWL (P < 0.01). As most of the power in the pedal stroke is generated during the mid-section of the down-stroke, movement of the activation range of knee extensors into the predominantly power phase of the pedal stroke would potentially account for increased efficiency and decreased cardio-respiratory costs. Greater activity of bi-articular RF, in the first 108º of the crank cycle at IWL (80 vs. 70º) may more closely resemble the pelvic stabilising activity of RF in running biomechanics; and potentially explain the more effective transition from cycling to running reported in triathletes using steeper STA. Berkeley Electronic Press 2017-12-01 /pmc/articles/PMC5786204/ /pubmed/29399245 Text en |
spellingShingle | Original Research DUGGAN, WILL DONNE, BERNARD FLEMING, NEIL Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title | Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title_full | Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title_fullStr | Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title_full_unstemmed | Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title_short | Effect of Seat Tube Angle and Exercise Intensity on Muscle Activity Patterns in Cyclists |
title_sort | effect of seat tube angle and exercise intensity on muscle activity patterns in cyclists |
topic | Original Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5786204/ https://www.ncbi.nlm.nih.gov/pubmed/29399245 |
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