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Ergometric lactate stress results of the patient. Lactate from peripheral venous blood was taken before exercise (pre) and immediately after finishing exercise (0), and after that at 5, 15, and 30 min. The measured resting lactate levels were normal. During an ergometric stress test, the lactate level steeply increased, and 30 min after the stress, the lactate level was still higher than double the resting level, which supports the disturbed function of muscle metabolism.
