Summary
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1.
The contractile activity of the isolated atrium of the rainbow trout was studied as a function of temperature. In the absence of adrenaline a rise in temperature from 2°C to 17°C increased the contractile force and frequency, and the total tension generated during one minute was doubled. On the other hand, the effects of adrenaline on the contractile activity were most pronounced at 2°C indicating that sympathetic activation may be especially important in adjusting the heart to maximal performance at the lower range of environmental temperature.
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2.
The atrial adrenoceptor mediating inotropic and chronotropic effects of adrenaline was characterized as aβ 2-adrenoceptors at temperatures between 2 and 14°C, in agreement with earlier findings for this species at 8°C. This conclusion was based on the effects of catecholamines and a series of selective receptor agonists and blocking agents.
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3.
The present results provide further evidence for an ‘adrenaline’-receptor of theβ 2-adrenoceptors in the atrium of the rainbow trout being the ‘innervated’ and ‘humoral’ adrenoceptor at all temperatures within the physiological range for this species.
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Ask, J.A., Stene-Larsen, G. & Helle, K.B. Temperature effects on theβ 2-adrenoceptors of the trout atrium. J Comp Physiol B 143, 161–168 (1981). https://doi.org/10.1007/BF00797695
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DOI: https://doi.org/10.1007/BF00797695