Variability of some objective measures of physical activity

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Bibliographic Details
Title translated into German:Variabilitaet einiger objektiver Messwerte koerperlicher Aktivitaet
Author:Gretebeck, Randall J.; Montoye, Henry J.
Published in:Medicine and science in sports and exercise
Published:24 (1992), 10 , S. 1167-1172, Lit.
Format: Publications (Database SPOLIT)
Publication Type: Journal article
Media type: Print resource
ISSN:0195-9131, 1530-0315
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Identification number:PU199304062074


The purpose of this study was to determine how many days subjects should be monitored to provide an estimate of habitual physical activity in employed men engaged in a wide range of occupations. Caloric intake, movement recorders (accelerometers and pedometers), and heart rate were the measurements studied in 30 subjects who were monitored during their waking hours for 7 continuous days. A repeated measures ANOVA showed no significant difference between days for any of the measures when only weekdays were compared. However, when weekend days were included a majority of the measures showed a significant F-ratio. An estimate was made of the number of days required to measure a 7-d period with less than 5 error. The average for all the different measures was 4.9 d. It appears that at least 5 or 6 d are needed to minimize the intra-individual variance a reasonable degree. Weekdays as well as weekend days need to be included. Verf.-Referat