**Ethical aspects**

All participants in the investigations presented in this chapter consented to the anonymous use of their data after being carefully informed about the aim of the study according to the Helsinki Charter (*http://www.wma.net/e/ethicsunit/helsinki.htm.*). The most recent submission to and passing of our experimental intentions by the ethical commission of the Austrian Federal Ministry for Defence and Sports (BMfLVS) dated from Dec. 13th, 2010.
