active and passive mechanics ( myocardial contractility and stiffness ) were studied in left ventricular papillary muscles and did not differ significantly between groups , with the exception of depressed contractility observed in young trained rats [ ( e.g. , papillary peak developed isometric tension at lmax ( length at peak tension ) ] was 2.64 +/- 0.24 g/mm2 in trained vs .
C0027061
myocardial
C0030352
papillary muscles