High resting triacylglycerol turnover of rainbow trout exceeds the energy requirements of endurance swimming

摘要

Fish may use lipoproteins instead of albumin-bound fatty acids to fuel endurance exercise, but lipoprotein kinetics have never been measured jn ectotherms. In vivo bolus injections of labeled very-low-density lipoproteins (~3H-VLDL labeled in vivo from donor fish) and continuous infusions of Intrafipid (~3H-labeled artificial emulsion) were used to investigate the effects of prolonged exercise (6 h at 1.5 body length/s) and heparin (600 U/kg) on the turnover rate of circulating triacylglycerol (TAG) in rainbow trout.