Fig. 4.

Velocity dependence. Experimental records for a chemically permeabilized sample of s⁻¹. canine myocardium subjected to ramp stretches with velocities ranging from 0.04 to 0.87 l₀ Panel (a) shows experimental records plotted against time. Panels (b and c) show force records plotted against sarcomere length. Panels (a and b) show records obtained when the preparation was immersed in pCa 6.2 solution and developing ~0.03 of its maximal Ca²⁺-activated tension. Panel (c) shows the response of the same preparation when it was immersed in pCa 9.0 solution with minimal free Ca²⁺. Experiments were performed at 15°C (reproduced with permission from Campbell et al. 2003)