Energetic, Cardiovascular, and Respiratory Aspects of Shark Swimming

研究工作涉及游泳鲨鱼的心输出量和心包压力之间的关系，并继续初步发现心包阳性和活动期间静脉压力升高。使用留置导管，我们将测量静息和活动鲨鱼的血压和呼吸血气水平，并根据乳酸水平确定厌氧率。最后，我们将开始研究P0、温度和游泳速度对游泳Triakis耗氧量的影响，并确定其有氧活动范围。本研究利用水下隧道跑步机研究鲨鱼运动的能量学，该跑步机已被用于同时测量不同游泳速度下的血流量、氧气利用、游泳运动、心率等。这些结果对我们理解鱼类游泳的生物力学具有重要意义。路易斯·e·伯内特博士（圣地亚哥大学）计划在水隧道跑步机/呼吸计中研究许多鱼（主要是鲨鱼）运动时的血气输送。特别强调将放在pH值和二氧化碳水平在调节氧气输送到组织中的作用。

The research efforts deal with the relationship between cardiac output and pericardial pressure in swimming sharks and continues preliminary findings of positive pericardial and enhanced venous pressures during activity. Using indwelling catheters we will measure blood pressures and determine respiratory blood gas levels in resting and active sharks and determine rates of anaerobiosis as indicated by lactate levels. Finally we will begin to examine effects of P0 , temperature, and swimming speed on the oxygen consumption rate of swimming Triakis and determine its aerobic scope for activity. The research deals with the energetics of locomotion in sharks using a water tunnel treadmill that has been adopted for simultaneous measurement of bloodflow, oxygen utililization, swimming motions, heart rate, etc. at various swimming speeds. The results are important to our understanding of biomechanics of swimming in fish. Dr. Louis E. Burnett (University of San Diego) plans to study blood gas transport in a number of fish (mainly sharks) during exercise in a water tunnel treadmill/respirometer. Particular emphasis will be placed on the role of pH and carbon dioxide levels in regulating oxygen delivery to the tissues.