to determine whether isolated changes in preload ( end-diastolic force ) can influence myocardial relaxation rate in normal or abnormal ( hypoxic or hypertrophic ) hearts , isolated lv papillary muscles from normal wistar-kyoto ( wky ) and spontaneously hypertensive ( shr ) rats were studied using physiologically sequenced contractions .
C0027061
myocardial
C0018787
hearts