thus , in the physiological range of the myocardium ( lmax - 85 p. 100 lmax ) the rat papillary muscle tended to maintain its maximal isotonic speed of contraction , or even to increase that speed , whereas the isometric contraction , isometric relaxation and isotonic relaxation phases were early and significantly depressed .
C0027061
myocardium
C0030352
papillary muscle