Volunteer Wearing Portable Metabolic Analyzer (IMAGE) Wiley Caption Volunteer wearing portable metabolic analyzer while performing test to measure energetic cost of walking-Credit-National Institute on Aging. Credit Journal of the American Geriatrics Society Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.