Muscle activation: effects of small length changes on calcium release in single fibers.
In single muscle fibers, small (1 percent) changes of length have a marked effect of both the calcium activation and the tension elicited by a constant current stimulus. The decrease in tension with shortening is accounted for almost entirely by a decrease in calcium release, rather than by changes in mechanical factors, such as filament geometry.
D000331:Aequorin; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D005071:Evoked Potentials; D066298:In Vitro Techniques; D008564:Membrane Potentials; D009119:Muscle Contraction; D009132:Muscles / Q000033:anatomy & histology / Q000378:metabolism*; D013329:Structure-Activity Relationship; D001468:Thoracica; D013997:Time Factors
D000331:Aequorin; D002118:Calcium