Document Detail

Gender differences in the passive stiffness of the human gastrocnemius muscle during stretch.
MedLine Citation:
PMID:  21298445     Owner:  NLM     Status:  Publisher    
The aim of this study was to determine whether muscle stiffness measured in vivo was different between males and females. Distal displacement of the gastrocnemius medialis myotendinous junction was measured directly using ultrasonography during passive dorsiflexion in eight males and eight females (age range 19-28 years). Plantarflexion torque and myotendinous junction displacement were measured at 5° intervals, where 0° was with the foot at right angles to the tibia. Stiffness of the gastrocnemius medialis muscle was calculated between 0° and 25° of dorsiflexion, and defined as passive plantarflexion torque/distal displacement of the myotendinous junction (N m cm(-1)). Relative muscle stiffness was also calculated as distal displacement relative to resting muscle length, and as passive torque relative to plantarflexion maximal voluntary contraction torque. No significant gender difference was observed in passive dorsiflexion torque, or in passive torque/maximal voluntary torque throughout the range of motion. Distal displacement of the gastrocnemius myotendinous junction was 26% more in females than in males (P < 0.05). Myotendinous junction displacement was 5.0 ± 1.4% of resting gastrocnemius medialis length in females, and 3.9 ± 0.6% in males. Over 25° of passive dorsiflexion, gastrocnemius medialis muscle stiffness was greater in males than in females by 44% (P < 0.05). In conclusion, based on the in vivo assessment of myotendinous junction displacement, passive gastrocnemius medialis muscle stiffness is greater in males than in females.
Christopher I Morse
Related Documents :
6714355 - Conduction velocities of nerve fibers proximal to muscle nerve transection in kittens a...
487305 - Oculomotor abnormalities in friedreich's ataxia.
1705215 - Orthodromic sensory conduction along the ring finger in normal subjects and in patients...
17473495 - Rapidly progressive guillain-barré syndrome following escherichia coli infection.
10980725 - Superficial peroneal nerve/peroneus brevis muscle biopsy in vasculitic neuropathy.
20451215 - Cck-4: psychophysiological conditioning elicits features of spontaneous panic attacks.
Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-2-6
Journal Detail:
Title:  European journal of applied physiology     Volume:  -     ISSN:  1439-6327     ISO Abbreviation:  -     Publication Date:  2011 Feb 
Date Detail:
Created Date:  2011-2-7     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100954790     Medline TA:  Eur J Appl Physiol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Institute for Performance Research, Department of Exercise and Sport Science, MMU Cheshire, Crewe Green Road, Crewe, Cheshire, CW1 5DU, UK,
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Three-month bilateral hopping intervention is ineffective in initiating bone biomarker response in h...
Next Document:  Genetic variants in TLR2 and TLR4 are associated with markers of monocyte activation: the Atheroscle...