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Article Dans Une Revue Stress Année : 2015

Reassessment of the cardio-respiratory stress response, using the king penguin as a model

Résumé

Research in to short-term cardio-respiratory changes in animais in reaction to a psychological stressor typically describes increases in rate of oxygen consumption (Vo,) and heart rate. Consequently, the broad consensus is that they represent a fundamental stressor response generalizable across adult species. However, movement levels can also change in the presence of a stressor, yet studies have not accounted for this possible confound on heart rate. Thus the direct effects of psychological stressors on the cardio-respiratory system are not resolved. We used an innovative experimental design employing accelerometers attached to king penguins (Aptenodytes patagonicus) to measure and thus account for mavement levels in a sedentary yet free-ta-mave animal model during a repeated measures stress experiment. As with previous studies on other species, incubating king penguins (N = 6) exhibited significant increases in both Va, and heart rate when exposed ta the stressor. Hawever, mavement levels, while still law, also increased in respanse ta the stressar. Once this was accaunted for by camparing periads oftime during the control and stress conditions when movement levels were similar as recorded by the accelerometers, only Va, significantly increased; there was no change in heart rate. These findings offer evidence that changing movement levels have an important effect on the measured stress response and that the cardia-respiratary respanse per se ta a psycholog ical stressor (Le. the respanse as a result of physialagical changes directly attributable to the stressar) is an increase in Vo, withaut an increase in heart rate.
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Dates et versions

hal-01145380 , version 1 (24-04-2015)

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Astrid S. T. Willener, Lewis G. Halsey, Siobhán Strike, Manfred R. Enstipp, Jean-Yves Georges, et al.. Reassessment of the cardio-respiratory stress response, using the king penguin as a model. Stress, 2015, 18 (1), pp.115-120. ⟨10.3109/10253890.2014.986451⟩. ⟨hal-01145380⟩
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