虹鳟（S. gairdneri R.）游泳速度、耗氧量、血浆儿茶酚胺与心脏功能之间的关系

Relationships between swimming speed, oxygen consumption, plasma catecholamines and heart performance in rainbow trout (S. gairdneri R.).

作者信息

Hughes G M, Bras-Pennec Y L, Pennec J P

机构信息

Research Unit for Comparative Animal Respiration, Bristol University, UK.

出版信息

Exp Biol. 1988;48(1):45-9.

PMID:3268427

Abstract

Rainbow trout swimming at controlled speeds in a tunnel respirometer have been used to measure oxygen consumption and plasma catecholamine levels, and systolic pressure/frequency relationships. Catecholamine (CA) levels evaluated in trout plasma at low swimming speed [0.5 bodylengths/second (bl/s)] were: adrenaline (A) 1.77 +/- 0.22 nM; noradrenaline (NA) 3.94 +/- 0.83 nM; dopamine (DA) 2.40 +/- 0.36 nM. No significant increase was observed during moderate exercise (1.5 bl/s): A 1.60 +/- 0.20 nM; NA 5.76 +/- 1.07 nM; DA 2.31 +/- 0.80 nM, or stronger exercise (2.0 and 2.5 bl/s-1): A 2.10 +/- 0.21 nM; NA 5.90 +/- 0.90 nM; DA 2.21 +/- 0.40 nM. A correlation was found between heart rate at these swimming speeds, and its position on the systolic pressure frequency curve of isolated hearts, which suggests that the heart functions at maximum systolic pressure at low (0.5 bl/s-1) swimming speeds and that this pressure decreases during exercise as cardiac frequency rises.

摘要

在隧道式呼吸计中以可控速度游泳的虹鳟鱼已被用于测量氧气消耗量、血浆儿茶酚胺水平以及收缩压/频率关系。在低游泳速度[0.5体长/秒（bl/s）]下评估的虹鳟鱼血浆中的儿茶酚胺（CA）水平为：肾上腺素（A）1.77±0.22 nM；去甲肾上腺素（NA）3.94±0.83 nM；多巴胺（DA）2.40±0.36 nM。在适度运动（1.5 bl/s）期间未观察到显著增加：A 1.60±0.20 nM；NA 5.76±1.07 nM；DA 2.31±0.80 nM，或更强运动（2.0和2.5 bl/s-1）期间：A 2.10±0.21 nM；NA 5.90±0.90 nM；DA 2.21±0.40 nM。在这些游泳速度下的心率与其在离体心脏收缩压频率曲线上的位置之间发现了相关性，这表明心脏在低（0.5 bl/s-1）游泳速度下以最大收缩压发挥功能，并且在运动期间随着心率增加该压力会降低。