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In a previous study we developed a method to estimate a person's age based on 10 s episodes of arterial pressure pulsations using a neural net technique. The pulsations were recorded in the morning in supine or semi-reclining position in rest. We wondered if the age estimation techniques would produce systematically different values under ambulatory conditions, during night or day, in other postures, over the 24 hours. We, therefore, analyzed 10 s episodes each half hour over the 24 hours in 12 previously recorded persons aged 19 to 58 years, applying the waveforms to the same neural net as previously developed. We pre-pared averages over the 24 hours, over the day, the night, the morning, and the siesta and compared them to calendar age of the persons. We found no systematic differences between the various estimates and with calendar age. We conclude that neural net estimation of a person's age based on his arterial pulse is stable during the 24 hours.
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