Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 61: 288-292, 1986;
8750-7587/86 $5.00
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Journal of Applied Physiology, Vol 61, Issue 1 288-292, Copyright © 1986 by American Physiological Society

ARTICLES

Muscle grafts overloaded by ablation of synergistic muscles

C. M. Donovan and J. A. Faulkner

We hypothesized that the mass and maximum tetanic tension (Po) of nerve-intact grafts overloaded by ablation of synergistic muscles would be greater than that of standard nerve-intact grafts or of control soleus muscles. Soleus muscles were grafted orthotopically and bilaterally in 35 female rats. Control soleus muscles were obtained from 30 age-matched cohorts. Twenty-eight days following grafting, gastrocnemius muscles were ablated bilaterally in half of the animals. Comparisons were made between 28 and 112 days following grafting. By 112 days the wet mass of the overload nerve-intact grafts was 138% of the standard grafts and 152% of the control soleus muscles, whereas the Po was 161% and 107%, respectively. Specific tension stabilized at approximately 19 +/- 1 N/cm2 for both types of grafts, significantly lower than the value of 24 +/- 1 N/cm2 for control soleus muscles. Ablation of synergistic muscles resulted in a significant and sustained increase in mass and Po in regenerating skeletal muscle autografts. We conclude that provided the appropriate conditioning stimulus small grafts (100-200 mg) are capable of achieving the values for the mass and Po of control muscles.


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