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dc.contributor.authorCurtin, N.A.
dc.contributor.authorLou, Fang
dc.contributor.authorWoledge, R.C.
dc.identifier.citationCurtin , N A , Lou , F & Woledge , R C 2010 , ' Sustained performance by red and white muscle fibres from the dogfish Scyliorhinus canicula ' , Journal of Experimental Biology , vol. 213 , no. 11 , pp. 1921-9 .
dc.identifier.otherPURE: 8195591
dc.identifier.otherPURE UUID: 4226df9b-8216-46bb-a88a-c9370fc7747a
dc.identifier.otherPubMed: 20472779
dc.identifier.otherScopus: 77952738943
dc.description.abstractThe mechanical performance of red and white muscle fibres from dogfish was compared during a long series of contractions with sinusoidal movement or under isometric conditions at 12 degrees C (normal in vivo temperature). Power output was measured during sinusoidal movement at 0.75 Hz and peak-to-peak amplitude about 12% L(0). Tetanus duty cycle was 33% (0.44 s) at phase -8% (first stimulus at 0.107 s before shortening started). Initially, the red fibres produced only about one third as much power as the white fibres, 6.57+/-0.63 W kg(-1) wet mass (mean +/- s.e.m.) and 18.3+/-2.3, respectively. Red fibres were better at sustaining power output; it declined rapidly to about 60% of its initial value and then remained relatively steady for up to 450 cycles of movement. Force during shortening declined, but force during stretch did not increase: force always relaxed to a low value before stretch started. By contrast, net power output by white fibres declined rapidly to zero within about 50 cycles. Two changes contributed: decline in force during shortening and an increase in force during stretch because relaxation became progressively less complete during the series of contractions. In isometric series (0.44 s stimulation every 1.33 s, cycle frequency 0.75 Hz), red and white fibres sustained peak isometric force similarly; in the 50th cycle force was 59+/-3% and 56+/-4% of initial values. The time required for force to relax to 10% of its maximum value decreased during the series for red fibres and increased for white fibres.en
dc.relation.ispartofJournal of Experimental Biology
dc.subjectBiomechanical Phenomena
dc.subjectMuscle Contraction
dc.subjectMuscle Fibers, Fast-Twitch
dc.subjectMuscle Fibers, Skeletal
dc.titleSustained performance by red and white muscle fibres from the dogfish Scyliorhinus caniculaen
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionDepartment of Human and Environmental Sciences
dc.contributor.institutionAgriculture, Veterinary and Food Sciences
dc.contributor.institutionPharmacology and Clinical Science Research
dc.description.statusPeer reviewed
rioxxterms.typeJournal Article/Review

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