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Fig. 4. Blood concentrations of glucose (A), lactate (B), fatty acid (FA) (C) and glycerol (D) at rest, during submaximal exercise (45 W and 100 W), after maximal exercise (max.) and after a 3 min recovery period (recov.) in arms and legs before and after crossing the Greenland icecap on cross-country skies. * In 4 of 4 subjects.