American Journal of Epidemiology Vol. 109, No. 2: 158-168
Copyright © 1979 by The Johns Hopkins University School of Hygiene and Public Health
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AN OBJECTIVE MEASURE OF PHYSICAL ACTIVITY FOR EPIDEMIOLOGIC RESEARCH
1 Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh Pittsburgh, PA 15261
2 Department of Psychiatry, Western Psychiatric Institute and Clinic, School of Medicine, University of Pittsburgh
1Reprint requests to Dr. LaPorte.
The development of a device Is reported called the Large-scale Integrated Motor Activity Monitor to examine physical activity during individuals' normal daily lives. The unit which is slightly larger than a wrist watch records body movement when worn at various body locations. Two population studies were conducted to evaluate the units. Experiment 1 examined 20 male graduate students for a two-day period. The data indicated that the units were sensitive to individual differences in physical activity and did not Interfere with normal activities. Experiment 2 compared 10 Physical Education majors with 10 non-Physical Education majors by having individuals log activities and record movement counts for a two-day period. The movement data revealed that the monitors significantly discriminated between the two populations. The energy expenditure derived from the specific loggings was highly related (r = +.69) to the trunk movements, indicating that the movement counts are an accurate estimate of physical activity. The high relationship to energy analysis, the sensitivity of the units and the ease of implementation indicate that the units may be useful in relating normal activity to acute heart disease and to risk factors such as obesity and lipoproteins.
coronary disease; physical fitness
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