We found this on Web MD:
Researchers at Brock University in Ontario measured the levels of testosterone and cortisol in hockey players before and after games. Testosterone is the macho hormone associated with muscle growth, aggression and risk-taking. And cortisol is a stress hormone that fires up the body’s fight or flight response……
In the study, levels of both hormones were highest before HOME games……Why? The researchers think the extra pressure of performing before family, friends and hometown fans spikes stress levels, while testosterone is raised by the old-fashioned impulse to defend your home from everything - including hockey pucks…… And home field advantage works for the ladies, too. In a study of female soccer players, women experienced a similar spike in hormone levels before home games……
So now the big question – how does this apply to you? Well when you can, hold important meetings on your home turf. And if you MUST be somewhere else, get your dose of high-octane hormones by packing the audience with people you care about……      
Home field advantage doesn’t guarantee success - take the Italian World Cup Team for example - but it certainly helps.
So, whether you’re trying to hit a home run on the softball field or in the staff meeting, go ahead let your body’s natural chemistry work for you……