Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis
Authors: Thomas, N.M., Dewhurst, S. and Bampouras, T.M.
Journal: Journal of Electromyography and Kinesiology
Volume: 25
Issue: 6
Pages: 870-875
eISSN: 1873-5711
ISSN: 1050-6411
DOI: 10.1016/j.jelekin.2015.08.007
Abstract:This investigation sought to determine the effects of fatigue on fascicle architecture across the length of the human gastrocnemius medialis (GM). With institutional ethical approval, fifteen healthy males performed repeated isometric plantar flexion maximal voluntary contractions (MVC) until peak force fell 30% below baseline. Brightness-mode ultrasound was used to determine fascicle length and pennation angle at rest and during MVC prior to and following the fatiguing contractions. The results show a significant increase in fascicle length during MVC in the distal (2.8 mm, 8.1%) middle, (4.9 mm, 14.1%), and proximal (5.2 mm, 14.7%) regions post-fatigue compared to pre-fatigue (p< 0.05). There was also a significant decrease of pennation angle during MVC in the distal (3.3°, 8.8%), middle (3.9°, 9.4%), and proximal (2.9°, 6.9%) regions post-fatigue compared to pre-fatigue (p< 0.05). These changes, however, were not region specific. These are the first results to show that fascicle shortening within the GM remains homogeneous following fatigue, suggesting that the fascicles were fatigued in a similar pattern throughout the muscle. The significant reduction of fascicle shortening may reflect an additional strategy to maintain an optimal force output in fatigued conditions, although future work is needed to confirm this notion.
Source: Scopus
Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis.
Authors: Thomas, N.M., Dewhurst, S. and Bampouras, T.M.
Journal: J Electromyogr Kinesiol
Volume: 25
Issue: 6
Pages: 870-875
eISSN: 1873-5711
DOI: 10.1016/j.jelekin.2015.08.007
Abstract:This investigation sought to determine the effects of fatigue on fascicle architecture across the length of the human gastrocnemius medialis (GM). With institutional ethical approval, fifteen healthy males performed repeated isometric plantar flexion maximal voluntary contractions (MVC) until peak force fell 30% below baseline. Brightness-mode ultrasound was used to determine fascicle length and pennation angle at rest and during MVC prior to and following the fatiguing contractions. The results show a significant increase in fascicle length during MVC in the distal (2.8 mm, 8.1%) middle, (4.9 mm, 14.1%), and proximal (5.2 mm, 14.7%) regions post-fatigue compared to pre-fatigue (p < 0.05). There was also a significant decrease of pennation angle during MVC in the distal (3.3°, 8.8%), middle (3.9°, 9.4%), and proximal (2.9°, 6.9%) regions post-fatigue compared to pre-fatigue (p < 0.05). These changes, however, were not region specific. These are the first results to show that fascicle shortening within the GM remains homogeneous following fatigue, suggesting that the fascicles were fatigued in a similar pattern throughout the muscle. The significant reduction of fascicle shortening may reflect an additional strategy to maintain an optimal force output in fatigued conditions, although future work is needed to confirm this notion.
Source: PubMed
Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis
Authors: Thomas, N.M., Dewhurst, S. and Bampouras, T.M.
Journal: JOURNAL OF ELECTROMYOGRAPHY AND KINESIOLOGY
Volume: 25
Issue: 6
Pages: 870-875
eISSN: 1873-5711
ISSN: 1050-6411
DOI: 10.1016/j.jelekin.2015.08.007
Source: Web of Science (Lite)
Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis
Authors: Thomas, N.M., Dewhurst, S. and Bampouras, T.M.
Journal: Journal of Electromyography and Kinesiology
Volume: 25
Issue: 6
Pages: 870-875
Publisher: Elsevier BV
ISSN: 1050-6411
DOI: 10.1016/j.jelekin.2015.08.007
Abstract:This investigation sought to determine the effects of fatigue on fascicle architecture across the length of the human gastrocnemius medialis (GM). With institutional ethical approval, fifteen healthy males performed repeated isometric plantar flexion maximal voluntary contractions (MVC) until peak force fell 30% below baseline. Brightness-mode ultrasound was used to determine fascicle length and pennation angle at rest and during MVC prior to and following the fatiguing contractions. The results show a significant increase in fascicle length during MVC in the distal (2.8 mm, 8.1%) middle, (4.9 mm, 14.1%), and proximal (5.2 mm, 14.7%) regions post-fatigue compared to pre-fatigue (p < 0.05). There was also a significant decrease of pennation angle during MVC in the distal (3.3°, 8.8%), middle (3.9°, 9.4%), and proximal (2.9°, 6.9%) regions post-fatigue compared to pre-fatigue (p < 0.05). These changes, however, were not region specific. These are the first results to show that fascicle shortening within the GM remains homogeneous following fatigue, suggesting that the fascicles were fatigued in a similar pattern throughout the muscle. The significant reduction of fascicle shortening may reflect an additional strategy to maintain an optimal force output in fatigued conditions, although future work is needed to confirm this notion.
Source: Manual
Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis.
Authors: Thomas, N.M., Dewhurst, S. and Bampouras, T.M.
Journal: Journal of electromyography and kinesiology : official journal of the International Society of Electrophysiological Kinesiology
Volume: 25
Issue: 6
Pages: 870-875
eISSN: 1873-5711
ISSN: 1050-6411
DOI: 10.1016/j.jelekin.2015.08.007
Abstract:This investigation sought to determine the effects of fatigue on fascicle architecture across the length of the human gastrocnemius medialis (GM). With institutional ethical approval, fifteen healthy males performed repeated isometric plantar flexion maximal voluntary contractions (MVC) until peak force fell 30% below baseline. Brightness-mode ultrasound was used to determine fascicle length and pennation angle at rest and during MVC prior to and following the fatiguing contractions. The results show a significant increase in fascicle length during MVC in the distal (2.8 mm, 8.1%) middle, (4.9 mm, 14.1%), and proximal (5.2 mm, 14.7%) regions post-fatigue compared to pre-fatigue (p < 0.05). There was also a significant decrease of pennation angle during MVC in the distal (3.3°, 8.8%), middle (3.9°, 9.4%), and proximal (2.9°, 6.9%) regions post-fatigue compared to pre-fatigue (p < 0.05). These changes, however, were not region specific. These are the first results to show that fascicle shortening within the GM remains homogeneous following fatigue, suggesting that the fascicles were fatigued in a similar pattern throughout the muscle. The significant reduction of fascicle shortening may reflect an additional strategy to maintain an optimal force output in fatigued conditions, although future work is needed to confirm this notion.
Source: Europe PubMed Central