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- W4241522583 abstract "Complex physiological dynamics have been argued to be a signature of healthy physiological function. Here we test whether the complexity of metabolic rate fluctuations in small endotherms decreases with lower environmental temperatures. To do so we examine the multifractal temporal scaling properties of the rate of change in oxygen consumption r(VO 2 ) , in the laboratory mouse Mus musculus , assessing their long range correlation properties across 7 different environmental temperatures, ranging from 0°C to 30°C. To do so, we applied multifractal detrended fluctuation analysis (MF-DFA), finding that r(VO 2 ) fluctuations show two scaling regimes. For small time scales below the crossover time (approximately 10 2 seconds), either monofractal or weak multifractal dynamics are observed depending on whether T a <15°C or T a > 15°C respectively. For larger time scales, r(VO 2 ) fluctuations are characterized by an asymptotic scaling exponent that indicates multifractal anti-persistent or uncorrelated dynamics. For both scaling regimes, a generalization of the multiplicative cascade model provides very good fits for the Renyi exponents τ(q) , showing that the infinite number of exponents h(q) can be described by only two independent parameters, a and b. We also show that the long-range correlation structure of r(VO 2 ) time series differs from randomly shuffled series, and may not be explained as an artifact of stochastic sampling of a linear frequency spectrum. These results show that metabolic rate dynamics in a well studied micro-endotherm are consistent with a highly non-linear feedback control system." @default.
- W4241522583 created "2022-05-12" @default.
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- W4241522583 date "2016-09-01" @default.
- W4241522583 modified "2023-09-26" @default.
- W4241522583 title "Nonlinear temperature effects on multifractal complexity of metabolic rate of mice" @default.
- W4241522583 doi "https://doi.org/10.7287/peerj.preprints.2404v1" @default.
- W4241522583 hasPublicationYear "2016" @default.
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