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Figure 2 Representative examples of the peripheral arterial tonometer (PAT) signal’s time course in PAT-normal and PAT-abnormal cases. (Upper tracing) A negative PAT responder showing the typical progressive increase in the signal throughout exercise. (Lower tracing) A progressive decrease in PAT signal amplitude, which was the hallmark of the vasoconstrictive response, representing a typical abnormal PAT response. Inserts show higher resolution samples at the start and end of exercise periods.
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