Key result
HRVS analysis may provide unique insight into intact cardiac function in free-swimming teleost fishes.
Why the study?
Heart regulation is typically studied using invasive interventions or isolated preparations, whereas analyzing the heart rate variability signal may provide insight into intact cardiac function in free-swimming fish.
Analysis of heart rate variability signals in rainbow trout may offer a non-invasive method to study cardiac regulation in free-living fish.
Hypothesis-generating for non-invasive cardiac monitoring in fish models; should not yet influence clinical practice.
Records of heart rate often show short-term variation in beat-to-beat interval which can be plotted as a heart rate variability signal (HRVS). It has been suggested that, in mammals, analysis of the HRVS can be used as a quantitative means of investigating control of cardiac function (McDonald, 1980). An HRVS can be recognised in the electrocardiograms (ECGs) of teleost fishes (Armstrong et al. 1989a) and these signals have been recorded by telemetry from free-living fish in their natural environment (Armstrong et al. 1989b). Regulation of the heart is usually studied by blocking components of the system by surgical or pharmacological intervention or using in vitro isolated preparations (Farrel, 1984). Analysis of the HRVS may provide a unique insight into the function of the intact system and should be applicable to free-swimming fish in their natural environment.
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Vera et al. (1991) studied Heart rate variability in rainbow trout. Heart rate variability signal (HRVS) analysis was evaluated. Analysis of the heart rate variability signal (HRVS) in teleost fishes may provide a unique insight into the function of the intact cardiac system in free-swimming fish.
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