Impact of methodological decisions on accelerometer outcome variables in young children

Ojiambo, Robert; Cuthill, Ruth; Budd, Hannah; Konstabel, Kenn; Casajús, José Antonio; González-Agüero, Alejandro; Anjila, Edwin; Reilly, John J.; Easton, Chris; Pitsiladis, YP

doi:10.1038/ijo.2011.40

Cited by 80 publications

(85 citation statements)

References 27 publications

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“…A recent study from Ojiambo et al (13) among children with a mean age of 7 years (±2 years) showed that collecting data with different epoch lengths significantly influenced the estimates of time spent in moderate-to-vigorous physical activity (MVPA) and being sedentary. Using shorter epochs of 15-s compared with 1-min resulted in less sedentary time and higher MVPA time in youth.…”

Section: Discussionmentioning

confidence: 99%

Comparing Different Accelerometer Cut-Points for Sedentary Time in Children

Fischer

Yιldιrιm

Salmon

et al. 2012

Pediatric Exercise Science

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Actigraph accelerometers are hypothesized to be valid measurements for assessing children's sedentary time. However, there is considerable variation in accelerometer cut-points used. Therefore, we compared the most common accelerometer sedentary cut-points of children performing sedentary behaviors. Actigraph Actitrainer uniaxial accelerometers were used to measure children's activity intensity (29 children, 5-11 years old) during different activities, namely playing computer games, nonelectronic sedentary games, watching television and playing outdoors. A structured protocol was the criterion for assessing the validity of four common cut-points (100, 300, 800, 1100 counts/minute). The median counts during all sedentary behaviors were below the lowest comparison cut-point of 100 cpm. The 75th percentile values for the sedentary behaviors were always below the cut-point of 300 cpm. Our results suggest that the cut-point of <100 cpm is the most appropriate.It has been argued that recent increases in overweight and obesity prevalence in youth (22) can partly be ascribed to the increased time spent sedentary (8). Sedentary behaviors is marked by a low metabolic equivalent intensity level (2) that involves activities primarily performed while sitting (e.g., television viewing, using the computer, playing electronic games). While secular trends suggest that there have been few changes to the amount of daily television viewed by young people in the last 50 years, access to electronic entertainment media in the home

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Section: Discussionmentioning

confidence: 99%

Comparing Different Accelerometer Cut-Points for Sedentary Time in Children

Fischer

Yιldιrιm

Salmon

et al. 2012

Pediatric Exercise Science

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“…It is argued that there is a need for consensus on the methodological decisions which influence accurate quantification of physical activity in young children , Ojiambo et al 2011.…”

Section: Introductionmentioning

confidence: 99%

Validity of wrist worn accelerometers and comparability between hip and wrist placement sites in estimating physical activity behaviour in preschool children

Hislop

Palmer²,

Anand

et al. 2016

Physiol. Meas.

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Wrist-worn accelerometers can increase compliance with wearing accelerometers, however, several large scale studies continue to use hip-worn accelerometers and it is unclear how comparable data is from the two sites. The study aims were: to investigate agreement between wrist-and hip-worn accelerometers and to determine the validity of Johansson et al cut-points for wrist worn accelerometers in preschool children.A sample of 32 preschool children (21 boys, 4.2 (0.5) years, BMI 16.6 (1.1)) were videoed wearing GT3X+ accelerometers on their wrist and hip while they engaged in 1 hour of free-play in their nursery.Children's activity were coded using, the Children's Activity Rating Scale (CARS): with CARS, level 1 'sedentary' and levels 2 to 5 were classified as time spent in TPA. Accelerometry data were processed using Johansson et al cut-points for the wrist data and Evenson et al cut-points for the hip data, into time spent in different intensities of PA. The mean counts per minute (cpm) from the hip and wrist were compared.There was a strong correlation between the hip and wrist cpm (r=0.81, p<0.01) and total count data (r=0.83 p<0.01), however there was a large systematic bias with wide limits of agreement. Good agreement (mean difference (LOA) 1.1 (-9.9, 12.1) was found between the CARS estimate of TPA (29.

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“…Ojiambo et al 7 reported that a minimum of seven to nine days, with at least six hours/day of monitoring were necessary to obtain data with good-quality data. They also reported at least one weekend day must be included.…”

Section: Discussionmentioning

confidence: 99%

“…According to Cliff et al 6 , the existing protocol for the use of accelerometry in preschool children is based on limited evidence and needs to evolve as studies on this method are developed. This is particularly important because few studies have explored the issue of time monitoring when using accelerometers in preschool children and the effects it can have on the quality of the assessment 7,8 . Therefore, the main objective of this study was to analyze how the estimates of physical activity levels and sample profiles (demographic and anthropometric data) vary according the use of different criteria to define valid monitoring periods.…”

Section: Introduccionmentioning

confidence: 99%

Influência do número de dias e de horas válidas de uso do acelerômetro na estimativa do nível de atividade física em pré-escolares de Recife, Pernambuco, Brasil

Lima

Barros

Júnior

et al. 2014

Rev. Bras. Cineantropom. Desempenho Hum.

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Influence of number of days and valid hours using accelerometry on the estimates of physical activity level in preschool children from Recife, Pernambuco, Brazil Abstract -A few studies have proposed the number of hours/day and the number of days of monitoring that should be completed to obtain good quality accelerometry data for preschool children. The aim of this study was to analyze how the estimates of physical activity levels and sample profiles (demographic and anthropometric data) vary according the use of different criteria to define valid monitoring periods. Children (n=180) aged three to five years were randomly selected among participants from a longitudinal study performed in Recife, Brazil. Children wore a GT1M Actigraph accelerometer on the right waist during a period of seven days, including the weekend days, using 15 s epochs. A total of 176 children were included in the study (52.8% boys; mean age of 4.3 years [s=0.8]). Using the criterion of 10+ hours/day of wearing time to define a valid monitoring day, 67.0% (n=118) and 36.9% (n=65) of the children showed 3+ and 5+ valid days, respectively. When the criterion of 5+ hours/day was used, the time spent in moderate activity was approximately 10 minutes shorter than when the criterion of 10+ hours/day was used. The criterion of 10+ hours/day for defining a valid monitoring day leads to a sample size reduction and the criterion of 5+ hours/day underestimates the moderate activity level. Key words: Accelerometry; Exercise; Health behavior; Physical activity; Preschool. (52,8% meninos; idade média de 4,3 anos [s=0,8] Resumo -Poucos estudos têm pesquisado acerca do número de horas/dia e o número de dias de monitoramento que devem ser completados para se obter boa qualidade de dados por meio do uso de acelerômetros para crianças pré-escolares. O objetivo deste estudo foi analisar a influencia em se usar diferentes critérios para definir períodos de monitoramento válido na estimativa nos níveis de atividade física e no perfil da amostra. Crianças (n=180) com idade de três a cinco anos

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Impact of methodological decisions on accelerometer outcome variables in young children

Cited by 80 publications

References 27 publications

Comparing Different Accelerometer Cut-Points for Sedentary Time in Children

Comparing Different Accelerometer Cut-Points for Sedentary Time in Children

Validity of wrist worn accelerometers and comparability between hip and wrist placement sites in estimating physical activity behaviour in preschool children

Influência do número de dias e de horas válidas de uso do acelerômetro na estimativa do nível de atividade física em pré-escolares de Recife, Pernambuco, Brasil

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