caa a22 4500 469118547 CHVBK 20180323133131.0 cr unu---uuuuu 170328e19921101xx s 000 0 eng 10.1007/BF02245875 doi (NATIONALLICENCE)springer-10.1007/BF02245875 No psychophysiological interactions between caffeine and stress? [Elektronische Daten] [Markus Hasenfratz, Karl Bättig] In earlier studies, the predominantlyβ-adrenergic effects of mental tasks and the α-adrenergic effects of caffeine on cardiovascular functions were observed to be simply additive without interaction. In the present study, annoying electrical shocks were superimposed on a mental task affording either active coping, which specifically raisesβ-adrenergic activation, or passive coping, and the 40 female subjects were preselected so as to differ in subjective stress susceptibility. Caffeine as well as the type of coping and the considered personality dimension produced significant effects, but almost no interactions were obtained. The stress resistant subjects, who tended toward more extraversion, emotional stability and more masculinity, had lower anxiety scores, rated their performance higher and had a greater cardiac output than the stress non-resistant subjects, who represented a rather normal population according to the FPI personality dimensions. Caffeine increased EEG alpha and beta frequency and delta power and decreased beta power, raised blood pressure and enhanced stress reactions in respiration amplitude and pre-ejection period. Active stress coping induced greater stress reactions in heart rate (increase), left ventricular ejection time (decrease) and ear pulse arrival time (decrease) than passive coping. Springer-Verlag, 1992 Caffeine nationallicence Stress coping nationallicence Stress proneness nationallicence Mental performance nationallicence Physiology nationallicence EEG nationallicence Personality nationallicence Hasenfratz Markus Comparative Physiology and Behavioral Biology Laboratory, Swiss Federal Institute of Technology, Turnerstrasse 1, CH-8092, Zürich, Switzerland aut Bättig Karl Comparative Physiology and Behavioral Biology Laboratory, Swiss Federal Institute of Technology, Turnerstrasse 1, CH-8092, Zürich, Switzerland aut Psychopharmacology Springer-Verlag 109/3(1992-11-01), 283-290 0033-3158 109:3<283 1992 109 213 https://doi.org/10.1007/BF02245875 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02245875 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Hasenfratz Markus Comparative Physiology and Behavioral Biology Laboratory, Swiss Federal Institute of Technology, Turnerstrasse 1, CH-8092, Zürich, Switzerland aut NATIONALLICENCE 700 1- Bättig Karl Comparative Physiology and Behavioral Biology Laboratory, Swiss Federal Institute of Technology, Turnerstrasse 1, CH-8092, Zürich, Switzerland aut NATIONALLICENCE 773 0- Psychopharmacology Springer-Verlag 109/3(1992-11-01), 283-290 0033-3158 109:3<283 1992 109 213 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer