Which term describes the degree of stretch of the ventricular cardiac muscle fibers at the end of diastole?

A preload (stretching) is greater in cardiac muscle fibers before contraction increases its contraction force. This preload is compared to the stretching of an elastic band because the more stretched that band, the more strongly it will return to its resting length. Within certain limits, the more the heart fills with blood during diastole, the greater the contraction force it will exert during diastole. The preload is proportional to the end-diastolic volume. Normally, the higher the end-diastolic volume, the greater the force that the heart will develop in the next contraction.