Effects of exercise-stress on ventilation, cardiac output and blood respiratory parameters in the carp, Cyprinus carpio
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Abstract 1. 1. Carp ( Cyprinus carpio ) were stressed to exercise by rolling in a respiration chamber. Ventilatory water flow rate, cardiac output and blood respiratory parameters were determined. 2. 2. During exercise, oxygen uptake increased about 3.5-fold and returned to pre-exercise level within 15 min. 3. 3. This exercise-stress resulted in no plasma acidosis and in no swelling of the erythrocytes. 4. 4. Ventilatory water flow rate increased 6-fold, whereas cardiac output increased 2-fold. Hence the ventilation-perfusion ratio increased during exercise. 5. 5. During exercise, arterial O 2 content (CaO 2 ) increased due to increases in O 2 tension (PaO 2 ), O 2 saturation of hemoglobin ( Sa O 2 ) and hemoglobin concentration (Hb). On the other hand, P vO 2 and S vO 2 remained at the resting levels but C vO 2 slightly increased due to an increase in Hb. 6. 6. Arterial-venous O 2 difference (CaO 2 - C vO 2 ) increased by 38%, which was met by a much greater increase in CaO 2 than C vO 2 .
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- Comparative Biochemistry and Physiology Part A: Physiology
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Comparative Biochemistry and Physiology Part A: Physiology 106 277-283, 1993-10-01
Elsevier BV