Abstract
We performed time series analysis of heartbeat interval of Japanese spiny lobster. We studied isolated and intact hearts. The fluctuation pattern of beat-interval was different in the two conditions. However, the power spectra derived from two conditions were not distinguishable. We, therefore, considered that those spectra might be contaminated by unsteady «trends» in constantly changing internal and external environments. In order to remove such potential trends, we applied detrended fluctuation analysis and obtained distinguishable scaling exponents between isolated and intact hearts: 0.51±0.02 and 0.8±0.2, respectively. Those exponents indicate that fluctuation of isolated hearts have white noise-like qualification, while that of intact hearts have а 1/f - like or а long-range correlation nature.These results suggest that, by using the scaling exponent, it may be possible to determine whether or not the heart has lost contact with the central nervous system, provided the exponent is derived from а large sample, for example about 10,000 beats.
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