Department of Marine Science and Technology, Tokyo University of Fisheries, Minato, Tokyo 108-8477, Japan
The heart rate change during swimming exercise and recovery for carp Cyprinus carpio was measured by electrocardiogram observation. Heart rate increased significantly during exercise at higher speeds of 2-5BL/s. The maximum value was 2.7 times the control value, while the rate of increase was not proportional to the swimming speed.
The heart rate after exercise decreased to the control level for recovery in a short time at lower speeds. The time for recovery after exercise was extended with increase of swimming speed over 3BL/s. Under the condition of exercise duration for 60min, the heart rate and the recovery time showed a similar response to those in the condition for 10min exercise.