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Assessing physical activity among children with accelerometers using different time sampling intervals and placements
Örebro universitet, Hälsoakademin. (RISPA)ORCID-id: 0000-0003-3793-335X
Örebro universitet, Hälsoakademin.
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.

Ort, förlag, år, upplaga, sidor
2002. Vol. 14, nr 1, s. 87-96
Nationell ämneskategori
Tvärvetenskapliga studier inom samhällsvetenskap Idrottsvetenskap Medicin och hälsovetenskap
Forskningsämne
Biomedicin
Identifikatorer
URN: urn:nbn:se:oru:diva-2875OAI: oai:DiVA.org:oru-2875DiVA, id: diva2:135393
Tillgänglig från: 2008-01-17 Skapad: 2008-01-17 Senast uppdaterad: 2020-01-29Bibliografiskt granskad
Ingår i avhandling
1. Physical activity assessed by accelerometry in children
Öppna denna publikation i ny flik eller fönster >>Physical activity assessed by accelerometry in children
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
activity patterns, adolescents, health promotion, activity monitor, sedentary
Nationell ämneskategori
Klinisk vetenskap
Forskningsämne
Biomedicin
Identifikatorer
urn:nbn:se:oru:diva-1739 (URN)978-91-7668-570-9 (ISBN)
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

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Nilsson, AndreasEkelund, UlfYngve, Agneta

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Nilsson, AndreasEkelund, UlfYngve, Agneta
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Tvärvetenskapliga studier inom samhällsvetenskapIdrottsvetenskapMedicin och hälsovetenskap

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