Ultradian oscillation in the heart rate of rainbow trout (Oncorhynchus mykiss) |
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Affiliation: | 1. Department of Chemistry and CESAM, University of Aveiro, Campus de Santiago, Aveiro 3810-193, Portugal;2. Spanish Institute of Oceanography (IEO), Subida a Radio Faro 50, Vigo 36390, Spain |
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Abstract: | - 1.1. Ultradian oscillations in the min and hr range on long-term (24-hr) computerized recordings of heart rate in rainbow trout Oncorhynchus mykiss, acclimated to 5, 10 and 15°C water temperature, were investigated. Eight-hour duration time series derived from the heart rate recordings were analysed for their harmonic content in the ultradian band by spectral analysis.
- 2.2. A significant ultradian rhythm at around 0.011 cycles/min (approximately 91-min period) was detected in the power spectral density functions of all the 8-hr duration time series derived from the heart rate recordings at the three experimental water temperatures.
- 3.3. The spectral power of the ultradian oscillation detected in heart rate of trout was found to increase significantly with increasing temperature.
- 4.4. The possible endogenous origin of the ultradian rhythm detected in heart rate of Oncorhynchus mykiss is discussed.
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