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Naslov:Whole muscle contractile parameters and thickness loss during 35-day bed rest
Avtorji:Pišot, Rado (Avtor)
Narici, Marco (Avtor)
Šimunič, Boštjan (Avtor)
de Boer, Maarten D. (Avtor)
Seynnes, Olivier (Avtor)
Jurdana, Mihaela (Avtor)
Biolo, Gianni (Avtor)
Mekjavić, Igor B. (Avtor)
Datoteke:URL http://www.springerlink.com/content/t733607305283h25/fulltext.pdf
 
Jezik:Angleški jezik
Vrsta gradiva:Delo ni kategorizirano
Tipologija:1.01 - Izvirni znanstveni članek
Organizacija:UPR - Univerza na Primorskem
Opis: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.
Ključne besede:Bed rest, skeletal muscle, muscle contraction, muscle thickness, mechanomyography, tensiomiography, ultrasound
Leto izida:2008
Št. strani:str. 409-414
Številčenje:Vol. 104, no. 2
UDK:616.74-007.23
COBISS_ID:1418195 Povezava se odpre v novem oknu
Število ogledov:2090
Število prenosov:58
Metapodatki:XML RDF-CHPDL DC-XML DC-RDF
Področja:Gradivo ni uvrščeno v področja.
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Skupna ocena:(0 glasov)
Vaša ocena:Ocenjevanje je dovoljeno samo prijavljenim uporabnikom.
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Sekundarni jezik

Jezik:Neznan jezik
Ključne besede:Bed rest, skeletne mišice, mišična kontrakcija, mišični obseg, tenziomiografija, ultrazvok

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