The goal of the Contrails project is to help preserve and disseminate the technical record of 20th century aerospace research, highlighting in particular the research endeavors of the Illinois Tech community.

Validation of the Aerospace Medical Research Laboratories 3-Channel Personal Telemetry System

Report Number: AMRL TR 64-124
Author: Ax, Albert F.
Corporate Author: The Lafayette Clinic
Laboratory: Biophysics Laboratory
Date of Publication: 1964-12
Pages: 34
Contract: AF 33(657)-9352
Project: 7222
AD Number: AD0610589

The art of physiological telemetry is borderline in three areas: (1) sensors, (2) transmitter, (3) data processing. This study assessed the AMRL 3-channel personal telemetry from all three aspects. Analysis of the records transmitted from men in various graded intensities of physical activity revealed that of the three physiological variables (respiration, EKG, and temperature), respiration was the least valid. Torso circumference changes sensed by rubber tube strain gages proved superior to the impedance method for measuring respiration. Some tentative findings on a stress interview study reveal the telemetry method to have promise. It was shown that the major difficulty preventing widespread use of physiological telemetry in significant field situations is the lack of a practicable high-speed data processing system which can distinguish and utilize the occasionally valid physiological signal emersed in artifact or noise produced by movements and changing environmental influences. The solution to the artifact problem is first to sense and utilize movement and environmental influences to gate out and to correct the physiological data and second to develop automatic editing apparatus and computer programs for recognition and selection of the valid signal patterns.

RAF Centre of Aviation Medicine
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