Thrill factor at Alton Towers (8 images)

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Scientists have carried out a series of independent tests on roller coaster riders to develop the first industry standard 'thrill factor' scale. Heart rates were measured using chest-worn ECG waveform recorders like those used to examine a heart's regularity and damage in medical research.

On their wrists, each person also wore a biosensor recorder like those used in lie detector tests to calculate their sweat production through the skin.

The results, taken from...
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