DR RAY CLARK & MERVYN GOFF / SCIENCE PHOTO LIBRARY DR RAY CLARK & MERVYN GOFF / SCIENCE PHOTO LIBRARY
Pair of thermographs (front and side views) of a man on an exercise bicycle, showing increased temperature over the active muscles of the body, notably in the leg. Thermograms record the heat distribution over the surface of a body. The colour code runs from white, which represents the hottest areas to dark blue and black the coldest.
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