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Why Do We Get Nervous?

What causes those butterflies in your stomach?
DAILY EPISODES, answering your burning questions.
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Use the hashtag #ScienceSays to share your burning Olympic questions!
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Written and created by Mitchell Moffit (twitter @mitchellmoffit) and Gregory Brown (twitter @whalewatchmeplz).

Supine and standing sympathovagal balance in athletes and controls.
http://www.ncbi.nlm.nih.gov/pubmed/8223523

Pre-competition imagery, self-efficacy and performance
http://www.tandfonline.com/doi/abs/10.1080/026404102320219400?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub%3dpubmed#.UwJpGRCwJcR

Playing with confidence: the relationship between imagery use and self-confidence and self-efficacy in youth soccer players.
http://www.ncbi.nlm.nih.gov/pubmed/18949659