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Am J Physiol Cell Physiol 233: C92-C98, 1977;
0363-6143/77 $5.00
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AJP - Cell Physiology, Vol 233, Issue 3 92-C98, Copyright © 1977 by American Physiological Society

ARTICLES

Mechanical properties of tracheal smooth muscle: effects of temperature

N. L. Stephens, R. Cardinal and B. Simmons

The effect of temperature on the isometric tetanic myogram was studied in isolated canine tracheal smooth muscle (TSM). At 37 degrees C and 27 degrees C no significant change occurred in maximum tetanic tension (PO). At 17 degrees C a significant reduction was seen Values of Q10 for contraction time (tPO) were almost halved, whereas those for rate of tension development (dP/dt) were almost doubled. The effect of the same temperatures on the force-velocity (F-v) relationships was also studied. All three F-v curves were described by the Hill equation, (P + a) (v + b) = (PO + a)b. Vmax and b decreased with decreased temperature, with Q10's demonstrating they were dependent on active processes. Finally, the decreased dP/dt of the myogram at lower temperatures was felt to be the probable result of decreased contractile element velocity because no decrease in series elastic component stiffness was demonstrable, there being instead an increase in stiffness at lower temperatures.


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R. A. Meiss and R. M. Pidaparti
Active and passive components in the length-dependent stiffness of tracheal smooth muscle during isotonic shortening
J Appl Physiol, January 1, 2005; 98(1): 234 - 241.
[Abstract] [Full Text] [PDF]


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