Scharold J, Lai N C, Lowell W R, Graham J B
Woods Hole Oceanographic Institution, MA 02543.
Exp Biol. 1989;48(4):223-30.
Heart rate, metabolic rate, and tailbeat frequency were simultaneously recorded from seven leopard sharks (Triakis semifasciata) during steady swimming at controlled speeds to evaluate the usefulness of heart rate as a measure of field metabolic rate. Heart rate was monitored by acoustic telemetry using a frequency modulated ECG transmitter. Metabolic rate was measured as oxygen consumption in a swimming tunnel respirometer. For instrumented sharks, mean resting oxygen consumption rate and heart rate were 105.3 +/- 35.6 (SE) mg O2.kg-1.h-1 and 36.6 +/- 1.8 (SE) beats.min-1, respectively. While swimming at the maximum sustained speed (0.84 +/- 0.03 lengths.s-1) for 30-60 min, these rates were 229.3 +/- 13.2 mg O2.kg-1.h-1 and 46.9 +/- 0.9 beats.min-1. Although a significant linear regression was obtained between metabolic rate and heart rate, a low overall correlation coefficient may result from the existence of separate individual regressions and confounding changes in stroke volume and/or arteriovenous oxygen difference. Heart rate was approximately as closely correlated with oxygen consumption rate as swimming speed was. A significant linear relationship was obtained between tailbeat frequency and swimming speed to speeds of 0.75 lengths.s-1.
在以可控速度稳定游泳期间，同时记录了七条豹纹鲨（半带皱唇鲨）的心率、代谢率和尾拍频率，以评估心率作为野外代谢率指标的有效性。使用调频心电图发射器通过声学遥测监测心率。代谢率通过游泳隧道呼吸计中的氧气消耗量来测量。对于安装了仪器的鲨鱼，平均静息耗氧率和心率分别为105.3±35.6（标准误）毫克氧气·千克⁻¹·小时⁻¹和36.6±1.8（标准误）次·分钟⁻¹。当以最大持续速度（0.84±0.03体长·秒⁻¹）游泳30 - 60分钟时，这些速率分别为229.3±13.2毫克氧气·千克⁻¹·小时⁻¹和46.9±0.9次·分钟⁻¹。尽管在代谢率和心率之间获得了显著的线性回归，但总体相关系数较低可能是由于存在单独的个体回归以及每搏输出量和/或动静脉氧差的混杂变化。心率与耗氧率的相关性与游泳速度与耗氧率的相关性大致相同。在尾拍频率和游泳速度之间，直到速度达到0.75体长·秒⁻¹时都获得了显著的线性关系。
