Computational modeling of muscle biomechanics 191
In the case of stretch, increasing cross-bridge torques would lead to fur-
ther energy storage. In the case of shortening, the torques of alpha-actinin,
actin, and titin would prevail, actin would rotate left, and energy would
be abolished by the non-axial (w.r.t. actin longitudinal axis) cross-bridge
force component. Only a part of the energy stored in titin would be avail-
able for release and support of the translational contraction. If cross-bridge
movement is geometrically constrained (Morgan, 1977) additional torques
are introduced laterally (perpendicular to myosin head movement), which
further complicates the gedanken experiment. In conclusion, the detailed
mechanisms of energy stor ...