Calibration of the Computer Science and Applications, Inc. accelerometer

We established accelerometer count ranges for the Computer Science and Applications, Inc. (CSA) activity monitor corresponding to commonly employed MET categories. Data were obtained from 50 adults (25 males, 25 females) during treadmill exercise at three different speeds (4.8, 6.4, and 9.7 km x h(-...

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Bibliographic Details
Published inMedicine and science in sports and exercise Vol. 30; no. 5; p. 777
Main Authors Freedson, P S, Melanson, E, Sirard, J
Format Journal Article
LanguageEnglish
Published United States 01.05.1998
Subjects
Adult
Calibration
Energy Metabolism
Exercise Test - standards
Female
Humans
Male
Physical Fitness
Reference Values
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Summary:We established accelerometer count ranges for the Computer Science and Applications, Inc. (CSA) activity monitor corresponding to commonly employed MET categories. Data were obtained from 50 adults (25 males, 25 females) during treadmill exercise at three different speeds (4.8, 6.4, and 9.7 km x h(-1)). Activity counts and steady-state oxygen consumption were highly correlated (r = 0.88), and count ranges corresponding to light, moderate, hard, and very hard intensity levels were < or = 1951, 1952-5724, 5725-9498, > or = 9499 cnts x min(-1), respectively. A model to predict energy expenditure from activity counts and body mass was developed using data from a random sample of 35 subjects (r2 = 0.82, SEE = 1.40 kcal x min(-1)). Cross validation with data from the remaining 15 subjects revealed no significant differences between actual and predicted energy expenditure at any treadmill speed (SEE = 0.50-1.40 kcal x min(-1)). These data provide a template on which patterns of activity can be classified into intensity levels using the CSA accelerometer.
ISSN:0195-9131
DOI:10.1097/00005768-199805000-00021