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Am J Physiol Gastrointest Liver Physiol 232: G580-G583, 1977;
0193-1857/77 $5.00
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AJP: Gastrointestinal and Liver Physiology, Vol 232, Issue 6, G580-G583
Copyright © 1977 by American Physiological Society

ARTICLES

Longitudinal force and stress of rat's esophagus: age-related changes

MP Zabinski and P Biancani

Longitudinal force-length relationship of the rat esophagus was studied in vitro in three age groups: 1 mo, 3 mo, and 12 mo. The length of maximum force development (MFD) occurs at 1.4-1.5 times the in vivo length for all age groups. The active force developed at MFD increases markedly with age. The difference in the active forces in the 3-mo and 12-mo age groups is due to differences in cross section because the active stress of the esophagus in the longitudinal direction is approximately equal for the two age groups. The active stress in the 1-mo-old rats is lower than in the 3-mo-old rats, suggesting an increased contractility of the esophagus with age in this period of development.




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