Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb.

Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Research Abstract Details 

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Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Abstract Text:

Kurt Manal,Dustyn P Roberts,Thomas S Buchanan,

Ultrasonography was used to measure the pennation angle of the human tibialis anterior (TA), lateral gastrocnemius (LG), medial gastrocnemius (MG), and soleus (Sol). The right and left legs of 8 male and 8 female subjects were tested at rest and during maximum voluntary contraction (MVC). Joint angles were chosen to control muscle tendon lengths so that the muscles were near their optimal length within the length-tension relationship. No differences in pennation angle were detected between the right and left legs. Another consistent finding was that the pennation angle at MVC was significantly greater than at rest for all muscles tested. Optimal pennation angles for the TA, MG, and Sol were significantly greater for the men than for the women. Optimal pennation angles for the TA, LG, MG, and Sol for the male subjects were 14.3 degrees, 23.7 degrees, 34.6 degrees, and 40.1 degrees respectively, whereas values of 12.1 degrees, 16.3 degrees, 27.3 degrees, and 26.3 degrees were recorded for the female subjects. The results of this study suggest the following: (1) similar values for pennation angle can be used for the right and left TA, LG, MG, and Sol; (2) pennation angle is significantly greater at MVC than at rest for all muscles tested; and (3) sex-specific values for optimal pennation angle should be used when modeling the force-generating potential of the primary muscles responsible for ankle plantar and dorsiflexion.

Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Publishing Authors By Initials

K Manal,DP Roberts,TS Buchanan,

For similar epidemiologic factors: sex factors research abstracts see: epidemiologic factors: sex factors research

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Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Journal Published:

PUBLICATION TYPE: Research Support, N.I.H., Extr

Journal: Journal of applied biomechanics

VOLUME: 22

Page Numbers: 255-63

Journal Abbreviation:

ISSN: 1065-8483

DAY: 3

MONTH: Nov

YEAR: 2006

Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Information

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LANGUAGE: eng

NlmUniqueID: 9315240

Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb. Keywords Mesh Terms:

KEYWORDS: Sex Factors

MESH TERMS: physiology

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Grant and Affiliation Information for Optimal pennation angle of the primary ankle plantar and dorsiflexors: variations with sex, contraction intensity, and limb.

AFFILIATION: Center for Biomedical Engineering Research, Department of Mechanical Engineering, University of Delaware, Newark, DE 19716, USA.

Country: United States

AGENCY: United States NICHD

GRANT: R01-HD38582

ACRONYM: HD

MEDLINETA: J Appl Biomech

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