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The lurch of an accelerating roller coaster triggers a range of emotions and changes in the body. Professor Brendan Walker, from Middlesex University, self-confessed 'thrill engineer' who specialises in roller coaster rides, and why we find speed so thrilling. "When the body's autonomic nervous system (the part of the nervous system responsible for control of the bodily functions not consciously directed) fires up, we get a massive release of adrenaline."
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