however , over the entire dose-response curve to isoproterenol , the relaxant effects of the catecholamine , i.e. , shortening of the times from stimulus to peak tension ( tpt ) and from stimulus to half-relaxation of tension ( rt 1/2 ) that accompanied twitch potentiation and tap changes in e did not occur in h .
C0022245
isoproterenol
C0007412
catecholamine