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Title:Whole muscle contractile parameters and thickness loss during 35-day bed rest
Authors:Pišot, Rado (Author)
Narici, Marco (Author)
Šimunič, Boštjan (Author)
de Boer, Maarten D. (Author)
Seynnes, Olivier (Author)
Jurdana, Mihaela (Author)
Biolo, Gianni (Author)
Mekjavić, Igor B. (Author)
Files:URL http://www.springerlink.com/content/t733607305283h25/fulltext.pdf
 
Language:English
Work type:Not categorized
Tipology:1.01 - Original Scientific Article
Organization:UPR - University of Primorska
Abstract:Extended exposure to microgravity leads to significant musculoskeletal adaptations. Contractile parameters of four skeletal muscles (biceps brachii-BB, vastus medialis-VM, biceps femoris-BF and gastrocnemius medialis-GM) were measured in ten healthy males (aged 22.3 +/- 2.2 years) during 35 days of horizontal bed rest by a mechanomyography-based method termed 'tensiomyography' (TMG). Two contractile parameters: contraction time (Tc) and maximal displacement (Dm) were individually measured from electrically evoked maximal single twitch TMG response of all four muscles before and after bed rest. Significant changes in Tc were found after bed rest, as shown by an increase in GM muscle Tc by 18% (p < 0.01). Dm values significantly increased (p < 0.01) after bed rest, by 24, 26 and 30% in the VM, BF and GM muscles, respectively. In the GM, the change in Dm significantly correlated with the decrease in muscle thickness (r = -0.70, p < 0.01). In conclusion, bed rest induced changes in both Dm and Tc of the TMG signal; changes in Dm being inversely related to those of muscle thickness. Amongst the investigated muscles, most affected, in terms of atrophy and mechanical alterations, were those of the lower limbs. The observed increase in Dm may be attributed to a decrease in muscle, as well as tendon stiffness, causing larger muscle fibre and non-contractile tissue oscillations following contraction.
Keywords:Bed rest, skeletal muscle, muscle contraction, muscle thickness, mechanomyography, tensiomiography, ultrasound
Year of publishing:2008
Number of pages:str. 409-414
Numbering:Vol. 104, no. 2
UDC:616.74-007.23
COBISS_ID:1418195 Link is opened in a new window
Views:2233
Downloads:70
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Secondary language

Language:Unknown
Keywords:Bed rest, skeletne mišice, mišična kontrakcija, mišični obseg, tenziomiografija, ultrazvok

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