This research was conducted by Gunter Kreutz, Stephan Bongard, Sonja Rohrmann, Volker Hodapp, and Dorothee Grebe at Wolfgang Goethe-University Frankfurt am Main, Germany [Now at the University of Oldenburg, Germany]
Summary
The research compared the levels of immunoglobulin A (S-IgA), cortisol and emotional states of people after they had participated in …