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Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis

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Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis. / Thomas, Neil M.; Dewhurst, Susan; Bampouras, Theodoros M.

In: Journal of Electromyography and Kinesiology, Vol. 25, No. 6, 01.12.2015, p. 870-875.

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Thomas, Neil M. ; Dewhurst, Susan ; Bampouras, Theodoros M. / Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis. In: Journal of Electromyography and Kinesiology. 2015 ; Vol. 25, No. 6. pp. 870-875.

Bibtex

@article{0084bf130caf4c0d9ebfe14efc7391c5,
title = "Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis",
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.",
keywords = "Fascicle length, Fatigue, Maximal voluntary contraction, Muscle, Pennation angle, Ultrasound",
author = "Thomas, {Neil M.} and Susan Dewhurst and Bampouras, {Theodoros M.}",
year = "2015",
month = dec,
day = "1",
doi = "10.1016/j.jelekin.2015.08.007",
language = "English",
volume = "25",
pages = "870--875",
journal = "Journal of Electromyography and Kinesiology",
issn = "1050-6411",
publisher = "Elsevier Ltd",
number = "6",

}

RIS

TY - JOUR

T1 - Homogeneity of fascicle architecture following repeated contractions in the human gastrocnemius medialis

AU - Thomas, Neil M.

AU - Dewhurst, Susan

AU - Bampouras, Theodoros M.

PY - 2015/12/1

Y1 - 2015/12/1

N2 - 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.

AB - 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.

KW - Fascicle length

KW - Fatigue

KW - Maximal voluntary contraction

KW - Muscle

KW - Pennation angle

KW - Ultrasound

U2 - 10.1016/j.jelekin.2015.08.007

DO - 10.1016/j.jelekin.2015.08.007

M3 - Journal article

C2 - 26409506

AN - SCOPUS:84947617092

VL - 25

SP - 870

EP - 875

JO - Journal of Electromyography and Kinesiology

JF - Journal of Electromyography and Kinesiology

SN - 1050-6411

IS - 6

ER -