Intrinsic and extrinsic neural and neurohumoral control of the decapod heart

Yazawa, T.; Kuwasawa, Kiyoaki

doi:10.1007/bf02118416

Cited by 48 publications

(25 citation statements)

References 51 publications

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“…This study concluded that because HR could regain basal levels rapidly after an interaction for both winners and losers, systemic levels of serotonin were unlikely to be heightened as a result of winning, as was suggested by earlier studies (Livingston et al, 1980). The crustacean heart is very sensitive to serotonin as well as other peptides and neuromodulators (Cooke and Sullivan, 1982;Guirguis and Wilkens, 1995;Wilkens et al, 1985;Wilkens and McMahon, 1992;Wilkens and Walker, 1992;Yazawa and Kuwasawa, 1992;Wilkens and Mercier, 1993). In addition, receptor down regulation would tend to correct for the effects of chronically elevated serotonin levels (Fone et al, 1998).…”

Section: Discussionmentioning

confidence: 69%

Heart rate measures in blind cave crayfish during environmental disturbances and social interactions

Listeman

Doshi

et al. 2000

Comparative Biochemistry and Physiology Part A: Molecular &

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Most animals continually assess the environment in which they live and alter their behavior according to various stimuli. As an observer, one looks for changes in a behavior indicating that an animal responded to a particular event. When the animal does not make significant behavioral changes as measured by bodily movements, the animal may be characterized as unresponsive to a given stimulus. This study demonstrates that when behavioral body movements can not be observed an internal physiological measure of heart rate (HR) shows dramatic changes following presentation of defined stimuli. This study used the blind cave crayfish and examined their responsiveness to the following stimuli: light (infrared, dim red, and white), water-borne vibrations, removal of water, olfactory cues, and social interaction with partners. This study demonstrates that there is substantial individual variation of HR at basal levels and with the intensity of an social interaction. We find HR is a reasonable measure of the responsiveness of blind cave crayfish to given stimuli even in the absence of observable behavioral changes. This enables the observer to determine if an individual is responsive to and making an assessment of particular cues.

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Section: Discussionmentioning

confidence: 69%

Heart rate measures in blind cave crayfish during environmental disturbances and social interactions

Listeman

Doshi

et al. 2000

Comparative Biochemistry and Physiology Part A: Molecular &

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“…The cardiac ganglia of various crustaceans is influenced by several sorts of neurohumoral inputs. These include neurohormones and the release of 5-HT into circulation by the pericardial organ and from other neuroendocrine structures (Grega and Sherman, 1975;Cooke and Sullivan, 1982;Wilkens and McMahon, 1992;Yazawa and Kuwasawa, 1992;McGaw et al, 1995;Wilkens, 1999). Since HR increases when exposed to 5-HT, we used HR as a potential measure of the intrinsic level of 5-HT in the animals when they are establishing aggressive and submissive social status, as well as during injections of various doses of 5-HT.…”

Section: Introductionmentioning

confidence: 99%

Heart rate within male crayfish: social interactions and effects of 5-HT

Listerman

Deskins

Bradacs

et al. 2000

Comparative Biochemistry and Physiology Part A: Molecular &

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Behaviors, such as those that establish dominant and subordinate social status, are thought to be driven by various neuromodulators and hormones. In crustaceans, the level of serotonin (5-HT) in the hemolymph is correlated with degree of aggressiveness. The crustacean heart is neurogenic and is modulated by neural secretion of 5-HT in the hemolymph, which bathes the cardiac tissue. We discuss and present the results of measuring heart rate (HR) of crayfish during interactions, as an indication of their state of excitability. HR is the result of multiple influences: a cocktail of hormones and modulators. HR was monitored during the periods in which crayfish established aggressive and submissive social status, during sham injections, and following injections of various doses of 5-HT. Crayfish, during an interaction to establish social status, can increase HR. Both the aggressive and submissive crayfish can dampen their HR within seconds during a pause in the interaction, while still posturing in an aggressive or submissive state. Injections of 5-HT to obtain systemic levels of approximately 100 nM-10 mM increase HR substantially for hours. This suggests that aggressive interactions and the establishment of a dominant posture may not be related to large increases in the free concentrations of 5-HT within the circulating hemolymph, since a sustained HR is not observed in aggressive animals. Instead, the results may demonstrate that inhibitory cardiac regulation is present in the aggressors during interactions and that a regulator is possibly 5-HT.

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“…Therefore, we have been studied crustacean heart as a model of human heart [4,11,12]. Crab's electrocardiograms (EKGs) were analysed by a random-walk analysis technique that we innovated by our group [4,5] and discovered that dying crab hearts (Figure 3) show a low scaling exponent [scaling index (SI)], and healthy crab hearts show a normal SI, near 1.0.…”

Section: Ekg: Crustaceansmentioning

confidence: 99%

“…With EKGs from freely moving lobsters/crabs, we found that the heartbeat patern is not continuous but intermitent if animals are not disturbed ( Figure 7). This intermitency is induced by the activity of cardioinhibitory nerve (Figure 8, [12]). Then, EKG analysis revealed that a relaxed lobster exhibits an SI near 1.0 and a nervous lobster exhibits an SI near 0.5 ( Figure 9).…”

Section: Ekg: Crustaceansmentioning

confidence: 99%

Anxiety, Worry and Fear: Quantifying the Mind Using EKG Time Series Analysis

Yazawa¹

2018

Time Series Analysis and Applications

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We analyse the heartbeat interval time series in this chapter. Our time series analysis concepts and techniques have been reported previously, for example, in the Intech Book chapter. Here, we would like to introduce how it works by presenting typical examples. The techniques can distinguish between healthy, sick and stressful hearts. All data were obtained by us from natural heartbeat data. Therefore, we have notes behind data, especially about behavioural psychological observations. Results of analysis are the following: healthy hearts exhibit a healthy scaling exponent (SI), which is near 1.0, stressful hearts exhibit a lower SI, such as 0.7, dying heart's SI approaches to 0.5, and so forth.

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Intrinsic and extrinsic neural and neurohumoral control of the decapod heart

Cited by 48 publications

References 51 publications

Heart rate measures in blind cave crayfish during environmental disturbances and social interactions

Heart rate measures in blind cave crayfish during environmental disturbances and social interactions

Heart rate within male crayfish: social interactions and effects of 5-HT

Anxiety, Worry and Fear: Quantifying the Mind Using EKG Time Series Analysis

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