Assessment of Physical Activity in Children and Adolescents

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What was the main focus of Robert Mang'eni Ojiambo's PhD thesis?

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The thesis focused on assessing physical activity in children and adolescents, specifically the impact of methodological and practical decisions in accelerometry studies.

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What are the two studies mentioned in the thesis?

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The Identification and Prevention of Dietary and Lifestyle Induced Health Effects in Children and Infants study (child sample) and the Kenya Adolescent Physical Activity study (adolescent sample).

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What was compared in the adolescent cohort during structured activities?

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The performance of uniaxial ActiTrainer accelerometry with heart rate monitoring was compared to triaxial GT3X accelerometry against indirect calorimetry.

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What was the result of using different epoch lengths in accelerometry studies?

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15-second epoch reports significantly higher engagement in physical activity compared to a 60-second epoch in both children and adolescents.

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How did the choice of cutpoints affect the study?

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The choice of cutpoints significantly affected the classification of physical activity and sedentary behavior in both cohorts.

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What was the minimum duration required to reliably measure physical activity in children and adolescents?

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A minimum of 6 hours for 7-9 days in children and 6 hours for 4-5 days in adolescents.

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Which type of accelerometry reported better predictive validity during structured activities?

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Triaxial accelerometry reported better predictive validity compared to uniaxial accelerometry.

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Did heart rate monitoring improve predictive validity during structured activities?

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No, heart rate monitoring did not improve the predictive validity of either accelerometer during structured activities.

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How did uniaxial and triaxial accelerometry compare during free living activities?

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They reported comparable predictive validity, but heart rate monitoring improved the predictive validity of uniaxial accelerometry by approximately 4%.

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What was significantly associated with energy expenditure in both cohorts?

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Total volume of physical activity and patterns (time engaged in light and moderate to vigorous physical activity).