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Physical activity assessed by accelerometry in children
Örebro universitet, Hälsoakademin. (RISPA)ORCID-id: 0000-0003-3793-335X
2008 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Physical activity (PA) is likely to constitute an important aspect of health-related behaviour in growing children. However, the knowledge on levels and patterns of PA in children is limited, due to the difficulty of precisely measuring this complex behaviour in normal daily living. Information on variables that significantly contributes to the variability in PA patterns is warranted as it may inform strategies for promoting physically active lifestyles in school-age youth. The overall purpose of the present studies was to increase the knowledge about the use of accelerometry when assessing PA in children, and examine sources of variability in objectively assessed PA behaviour in children. The study samples included 1954 nine- and 15-year-old children from four geographical locations in Europe (Norway, Denmark, Estonia and Portugal), and additionally 16 Swedish seven-year-old boys and girls. PA was assessed by the MTI accelerometer during free-living conditions, including both weekdays and weekend days. A part of the PA assessment was conducted using different time sampling intervals (epochs). Predictions of estimates of daily energy expenditure from accelerometer output were calculated using previously published equations. Potential correlates of PA behaviour were assessed by self-report. The main findings were; a) the epoch setting had a significant effect when interpreting time spent at higher intensities of PA in young children, b) predicted energy expenditure differed substantially between equations, c) between- and within-day differences in overall levels of PA, time spent at moderate-to-vigorous intensity physical activity and time spent sedentary differed between age, gender and geographical location, d) outdoor play and sports participation were differentially associated with objectively measured PA in 9- and 15-year-old children. It is concluded that the sporadic nature of children’s physical activity require very short epoch settings for detecting high intensity PA, and that different published equations for estimations of daily energy expenditure cannot be used interchangeably. The interpretations of average energy expenditure from available equations should be made with caution. Based on a large sample of children of different ages, weekend days and leisure time during weekdays seem appropriate targets when promoting PA in order to increase the proportion of children achieving current recommendations on health enhancing PA. Further, significant correlates of PA behaviour dependent on age group are presented, which should be considered when planning interventions for promoting PA in school-age youth.

Ort, förlag, år, upplaga, sidor
Örebro: Örebro universitet , 2008. , s. 84
Serie
Örebro Studies in Medicine, ISSN 1652-4063 ; 12
Nyckelord [en]
activity patterns, adolescents, health promotion, activity monitor, sedentary
Nationell ämneskategori
Klinisk vetenskap
Forskningsämne
Biomedicin
Identifikatorer
URN: urn:nbn:se:oru:diva-1739ISBN: 978-91-7668-570-9 (tryckt)OAI: oai:DiVA.org:oru-1739DiVA, id: diva2:135397
Disputation
2008-02-07, Hörsal G, G-huset, Örebro universitet, 13:00
Opponent
Handledare
Tillgänglig från: 2008-01-17 Skapad: 2008-01-09 Senast uppdaterad: 2019-09-20Bibliografiskt granskad
Delarbeten
1. Assessing physical activity among children with accelerometers using different time sampling intervals and placements
Öppna denna publikation i ny flik eller fönster >>Assessing physical activity among children with accelerometers using different time sampling intervals and placements
2002 (Engelska)Ingår i: Pediatric Exercise Science, ISSN 0899-8493, Vol. 14, nr 1, s. 87-96Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The aim was to investigate (a) the effect of five different time sampling intervals (epoch settings) on different intensity levels when assessing physical activity with an accelerometer (CSA, WAM 7164), and (b) whether the placement of the monitor (on the hip and back) would affect the outcome. Sixteen children (aged 7 yrs) were monitored for four consecutive days. A significant main epoch effect was found for time spent at very high (p < 01) and high (p < 01) intensity activities. No significant difference between the two placements regarding total amount of physical activity (cnts times mm super (-1)) or different intensity levels was observed. In conclusion, different time sampling intervals, but not placement, should be carefully considered when assessing physical activity.

Nationell ämneskategori
Tvärvetenskapliga studier inom samhällsvetenskap Idrottsvetenskap Medicin och hälsovetenskap
Forskningsämne
Biomedicin
Identifikatorer
urn:nbn:se:oru:diva-2875 (URN)
Tillgänglig från: 2008-01-17 Skapad: 2008-01-17 Senast uppdaterad: 2020-01-29Bibliografiskt granskad
2. Comparison of equations for predicting energy expenditure from accelerometer counts in children
Öppna denna publikation i ny flik eller fönster >>Comparison of equations for predicting energy expenditure from accelerometer counts in children
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2008 (Engelska)Ingår i: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 18, nr 5, s. 643-650Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Several prediction equations developed to convert body movement measured by accelerometry into energy expenditure have been published. The aim of this study was to examine the degree of agreement between three different prediction equations, when applied to data on physical activity in a large sample of children. We examined 1321 children (663 boys, 658 girls; mean age 9.6+/-0.4 years) from four different countries. Physical activity was measured by the MTI accelerometer. One equation, derived from doubly labeled water (DLW) measurements, was compared with one treadmill-based (TM) and one room calorimeter-based (CAL) equation (mixture of activities). Predicted physical activity energy expenditure (PAEE) was the main outcome variable. In comparison with DLW-predicted PAEE, both laboratory-derived equations significantly (P<0.001) overestimated PAEE by 17% and 83%, respectively, when based on a 24-h prediction, while the TM equation significantly (P<0.001) underestimated PAEE by 46%, when based on awake time only. In contrast, the CAL equation agreed better with the DLW equation under the awake time assumption. Predicted PAEE differ substantially between equations, depending on time-frame assumptions, and interpretations of average levels of PAEE in children from available equations should be made with caution. Further development of equations applicable to free-living scenarios is needed.

Ort, förlag, år, upplaga, sidor
Oxford: Blackwell, 2008
Nationell ämneskategori
Medicin och hälsovetenskap Tvärvetenskapliga studier inom samhällsvetenskap Idrottsvetenskap
Forskningsämne
Idrottsvetenskap
Identifikatorer
urn:nbn:se:oru:diva-2876 (URN)10.1111/j.1600-0838.2007.00694.x (DOI)
Tillgänglig från: 2008-01-17 Skapad: 2008-01-17 Senast uppdaterad: 2019-09-20Bibliografiskt granskad
3. Between- and within-day variability in physical activity and inactivity in 9- and 15-year-old European children
Öppna denna publikation i ny flik eller fönster >>Between- and within-day variability in physical activity and inactivity in 9- and 15-year-old European children
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2009 (Engelska)Ingår i: Scandinavian Journal of Medicine and Science in Sports, ISSN 0905-7188, E-ISSN 1600-0838, Vol. 19, nr 1, s. 10-18Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

To examine differences in levels of physical activity (PA), time spent at moderate-to-vigorous intensity PA (MVPA) and time spent sedentary between and within days in children from four European countries, 1954 9 - and 15-year-olds were included. PA was measured during 2 weekdays and 2 weekend days using the manufacturing technology-incorporated (MTI) accelerometer. Average count per minute, time spent sedentary, time spent at MVPA and the proportion of children accumulating > or =60 min of MVPA were calculated. Data were compared between weekdays and weekend days and between school time and leisure-time. Although not entirely consistent across countries, overall PA, time spent sedentary and the proportion of children accumulating > or =60 min of MVPA were higher during weekdays compared with weekend days. Differences in overall PA between school time and leisure-time were highly inconsistent between countries. Few children (4-31%) accumulated > or =60 min of MVPA either during school time or during leisure-time. Differences in activity patterns between weekdays and weekend days are explained by less accumulated time in MVPA during weekend days. Weekend days and leisure-time during weekdays seem appropriate targets when promoting PA in order to increase the proportion of children achieving current recommendations on health-enhancing PA.

Ort, förlag, år, upplaga, sidor
Oxford: Wiley-Blackwell, 2009
Nationell ämneskategori
Tvärvetenskapliga studier inom samhällsvetenskap Idrottsvetenskap Medicin och hälsovetenskap
Forskningsämne
Idrottsvetenskap; Biomedicin
Identifikatorer
urn:nbn:se:oru:diva-2877 (URN)10.1111/j.1600-0838.2007.00762.x (DOI)000262901500003 ()18248534 (PubMedID)2-s2.0-59149094073 (Scopus ID)
Tillgänglig från: 2008-01-17 Skapad: 2008-01-17 Senast uppdaterad: 2019-09-20Bibliografiskt granskad
4. Correlates of objectively assessed physical activity and sedentary time in children: a cross-sectional study (The European Youth Heart Study)
Öppna denna publikation i ny flik eller fönster >>Correlates of objectively assessed physical activity and sedentary time in children: a cross-sectional study (The European Youth Heart Study)
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2009 (Engelska)Ingår i: BMC Public Health, ISSN 1471-2458, E-ISSN 1471-2458, Vol. 9, artikel-id 322Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Background

Identifying leisure time activities performed before and after school that influence time in physical activity (PA) and/or time spent sedentary can provide useful information when designing interventions aimed to promote an active lifestyle in young people. The purpose of this study was to examine associations between mode of transportation to school, outdoor play after school, participation in exercise in clubs, and TV viewing with objectively assessed PA and sedentary behaviour in children.

Methods

A total of 1327 nine- and 15-year-old children from three European countries (Norway, Estonia, Portugal) participated as part of the European Youth Heart Study. PA was measured during two weekdays and two weekend days using the MTI accelerometer, and average percent of time in moderate-to-vigorous PA (MVPA) and time spent sedentary were derived. Potential correlates were assessed by self-report. Independent associations between self-reported correlates with percent time in MVPA and percent time sedentary were analysed by general linear models, adjusted by age, gender, country, measurement period, monitored days and parental socio-economic status.

Results

In 9-year-olds, playing outdoors after school was associated with higher percent time in MVPA (P < 0.01), while participation in sport clubs was associated with higher percent time in MVPA (P < 0.01) in 15-year-olds. No associations with percent time sedentary were observed in either age group.

Conclusion

Frequency of outdoor play after school is a significant correlate for daily time in MVPA in 9-year-olds, while this correlate is attenuated in favour of participation in sport and exercise in clubs in 15-year-olds. Targeting walking to school or reduced TV viewing time in order to increase time in daily MVPA in children is unlikely to be sufficient. Correlates related to time spent sedentary need further examination.

Ort, förlag, år, upplaga, sidor
London: BioMed Central, 2009
Nyckelord
assessment, accelerometer, children, health behaviours
Nationell ämneskategori
Tvärvetenskapliga studier inom samhällsvetenskap Idrottsvetenskap Medicin och hälsovetenskap
Forskningsämne
Idrottsvetenskap; Biomedicin
Identifikatorer
urn:nbn:se:oru:diva-2878 (URN)10.1186/1471-2458-9-322 (DOI)000270675100001 ()19735565 (PubMedID)2-s2.0-70349311819 (Scopus ID)
Tillgänglig från: 2009-06-03 Skapad: 2009-05-25 Senast uppdaterad: 2019-09-20Bibliografiskt granskad

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