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Get Advances in Biomedical Engineering. Volume 3 PDF

By J.H.U. Brown, J.F. Dickson

ISBN-10: 0120049031

ISBN-13: 9780120049035

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The extent of stretch (abscissa) is normalized with respect to the unstressed length, Lu. Reproduced from Beneken and De Wit (1967) with the permission of the authors and publisher. F I G . 19B. Force-length relationships of the parallel elastic element and contractile element in Fig. 18. Plotted on the abscissa is the absolute length of P E which is equal to the length of C E . For further explanation, see text. Reproduced from Beneken and De Wit (1967) with the permission of the authors and publisher.

Pulmonary venous pressure was fixed in this test, and the changes in cardiac output (F), aortic pressure (PAO), and left ventricular end-diastolic and systolic volume (VLVED, VLVES) are plotted. An increase in arterial resistance resulted in an increase in PAo and a reciprocal ^FχlO i înm 3 8βc" , Δ R V««1*™3 200 1Jp«10" inkg" «ec 3 , -2 Γ*1 ^LVtoj I <£. K. (min 5 1 -y* '· r~ ^Z ^ [ -8D| 100 100 T j 5Fi <^ 1 ,P "Ϊ SV2 Γ^Ί V CiDSL I 0 N -ι f«72 min 1 w»H 1 11 1 0 :N ν r, * MXN F I G . 24. (A) Effect of changing the maximum shortening velocity of the contractile element, F c m a x (abscissa), on various hemodynamic variables.

The fully activated contractile element's force (Κ0ο) was related to its length (Lc) based on Sonnenblick's measurement (1962) (Fig. 19B). Likewise, the force (Kp) that the parallel elastic element exerts when it is stretched beyond the muscle's unstressed length was expressed by another curvilinear relation (Fig. 19B). 12), a fraction of its active force, K0C) at respective lengths. When these forces were combined, the total maximal force, Ktot, max, in the contracted state and the total minimal force, Ktot, min> in the relaxed state were related to the normalized initial muscle length as shown in Fig.

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Advances in Biomedical Engineering. Volume 3 by J.H.U. Brown, J.F. Dickson


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