Fig. 7.

Naltrindole (200 μg), injected into the abdominal aorta, had no effect on the peak pressor responses to both static contraction (A) and tendon stretch (B) in either freely perfused or ligated rats. Naltrindole slightly but significantly (P < 0.05) attenuated the cardioaccelerator response to contraction in the freely perfused but not in the ligated rats (A). TTI for both contraction and tendon stretch were not altered by naltrindole. Horizontal brackets connect means that were significantly different from each other (P < 0.05). B signifies the response before naltrindole injection; N signifies the response after naltrindole injection.