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Cold pressor stress affects cardiac attenuation of startle

Cold pressor stress affects cardiac attenuation of startle,10.1016/j.ijpsycho.2010.12.008,International Journal of Psychophysiology,André Schulz,Debor

Cold pressor stress affects cardiac attenuation of startle   (Citations: 1)
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Stress may affect cardio-afferent neural traffic. We investigated whether acute autonomic stress has an impact on cardiac modulation of startle (CMS), a ‘background’ methodology for assessing baro-afferent signal transmission. Therefore, 38 healthy volunteers received acoustic startle stimuli (105dB) at 6 different latencies relative to the R-wave (R +0, 100, 200, 300, 400, and 500ms; randomized order), both before and immediately after either a cold pressor (n=19) or a control intervention (n=19). Blood pressure was enhanced significantly in the cold pressor group right after the intervention (+13.7/5.7mmHg), reflecting sustained autonomic activation after the stress procedure. Before stress, startle responses were lowest for latencies of R +200 and +300ms, corroborating previous findings. After the cold pressor test, startle responsiveness was lowest for earlier latencies (R +0, +100 and +200ms). Stress facilitation of pre-ejection baro-afferent traffic originating from atrial mechano-sensitive receptors may be associated with this time shift effect. We conclude that the cardiac modulation of startle is sensitive to altered temporal baro-afferent feedback characteristics induced by stress and autonomic activation.
Journal: International Journal of Psychophysiology - INT J PSYCHOPHYSIOL , vol. 79, no. 3, pp. 385-391, 2011
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