Document Detail


The effect of the oral contraceptive pill on the passive stiffness of the human gastrocnemius muscle in vivo.
MedLine Citation:
PMID:  23445919     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
The aim of this investigation was to determine the effect of sustained monophasic oral contraceptive pill (MOCP) use on the in vivo passive stiffness of the gastrocnemius medialis (GM) muscle-tendon unit. Twenty four females volunteered for this study (age range 20-25 yrs); twelve participants had been taking the combined MOCP for a minimum of 12 months, and twelve participants, who had never taken the MOCP, formed a control group. Distal displacement of the GM myotendinous junction (MTJ) was measured during passive dorsiflexion at 2 Nm increments to 20 Nm, and at end range of motion using ultrasonography. In addition, GM MTJ displacement was measured at passive torques equivalent to 5, 10 and 15% of plantarflexion maximal voluntary contraction (MVC) torque, and relative to GM length. MOCP users had significantly greater GM MTJ displacement at all passive torques (P<0.01), reaching 40% more at 20 Nm; these displacements remained significantly different when MVC and GM length were accounted for (P<0.01). Passive muscle stiffness from 0-20 Nm was 31% less in MOCP users compared to non-users (P<0.01). In conclusion, based on the in vivo assessment of GM MTJ displacement, passive muscle stiffness is less in MOCP using females, compared to non-pill users.
Authors:
C I Morse; J Spencer; A W Hussain; G L Onambele
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of musculoskeletal & neuronal interactions     Volume:  13     ISSN:  1108-7161     ISO Abbreviation:  J Musculoskelet Neuronal Interact     Publication Date:  2013 Mar 
Date Detail:
Created Date:  2013-02-28     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101084496     Medline TA:  J Musculoskelet Neuronal Interact     Country:  Greece    
Other Details:
Languages:  eng     Pagination:  97-104     Citation Subset:  IM    
Affiliation:
Institute for Performance Research, Department of Exercise and Sport Science, Manchester Metropolitan University Cheshire, United Kingdom.
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