Background: Nowadays, decreased physical activity is considered to be a contributor to increase the prevalence of many diseases such as obesity, coronary heart disease and so on. Many researches demonstrated that regular physical activity reduce all cause mortality. To increase the physical activities of the population, accurate estimation of the activities is needed. Actical and actigraph are confirmed as accurate tools to measure physical activities. But the target populations of the validity studies were not Asian people. Therefore, the accuracy of the accelerometers should be confirmed in Asian people. The accuracy of the tools could be different. Therefore head to head comparison study between the tools would be needed. Methods: Thirty volunteers from the community, ages over 20 yrs, were recruited. The participants put on the two accelerometers (Actical, Actigraph) on the waists, secured with elastic belts, and performed a session of rest and three structured activities (two walking speeds, 4 km/hr and 6 km/hr, and one jogging speed, 8 km/hr). During each activity, expired respiratory gases were collected, and oxygen consumption (VO2) was measured by indirect calorimetry (Model Quark Ղ2Ⱂ). The calories measured by gas analyzer and two accelerometers were compared by correlation analysis using SPSS program. Results: Pearson correlation coefficient between gas analyzer and two accelerometers was calculated at three structured activities. The r in Actical was 0.747, 0.785, and 0.677, at speed of 4, 6, 8 km/hr, respectively (P＜0.05), and the same measures in Actigraph was 0.617, 0.737, and 0.530 (P＜0.05), respectively. Pearson correlation coefficient was also calculated between the two accelerometers, and the r was 0.881, 0.927, and 0.824, at each speed. Conclusion: The Actical and Actigraph are valid tools for measuring physical activities in Korean people. (J Korean Acad Fam Med 2008;29:668-674)
Background Recently, the prevalence of childhood obesity has increased dramatically, but the cause still remains incompletely understood. The goal of this study was to present a direction for treatment and prevention of childhood obesity on the basis of the data of physical activity energy expenditure, inactive time and dietary habits of Korean children. Methods: A total of 56 children were selected from 8 elementary schools in Seoul and Gwacheon-city. Children's physical activity pattern and dietary habits were obtained by questionnaire. The children wore accelerometer on their wrists from Friday to Tuesday over the whole weekend. Then, we calculated the activity energy expenditure using the activity counts recorded on the accelerometer. Results: Neither the physical activity energy expenditure (kcal/kg) nor the activity pattern showed a significant difference between the normal weight group and the overweight group. The overweight children spent more time watching TV and using the computer. The overweight group did not have breakfast and ate much more and faster in terms of dietary habit. Conclusion: This study suggests that bad habituations in diet and increase of inactivity time can play more important role than physical activity in causing overweight in 7-year-old children. (J Korean Acad Fam Med 2007;28: 195-203)
Background : The purpose of this study was to compare the Physical Activity Recall (Stanford 7-days physical activity recall) with the Triaxial accelerometer (RT3) to assess physical activity in young adults.
Methods : Thirty-seven subjects wore the RT3 for 24 hours and then completed the physical activity recall. The Stanford 7-Day Recall records hours of sleep, light-, moderate-, hard- and very hard levels of physical activity.
Results : The total energy expenditure per day for the Stanford 7-day recall and RT3 was 2381.29±594.93 kcal/day and 2232.97±398.32 kcal/day, respectively, and showed high correlation (r=0.821). The activity energy expenditure per day for the Stanford 7-day recall and RT3 was 836.21±290.5 9 kcal/day and 509.83±181.57 kcal/day, respectively, and showed less high but significant correlation (r=0.327). When compared by sex, the total energy expenditure was significantly correlated in men (r=0.572) and the activity energy expenditure in women (r=0.484).
Conclusion : The Stanford 7-day recall and the RT3 was highly correlated in the total energy expenditure and significantly correlated in the activity energy expenditure. Therefore, it may be used reciprocally to assess physical activity.
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