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dc.contributor.authorSmuts, Cornelius M.
dc.contributor.authorGreeff, Jani
dc.contributor.authorKvalsvig, Jane
dc.contributor.authorZimmermann, Michael B.
dc.contributor.authorBaumgartner, Jeannine
dc.date.accessioned2016-10-12T10:55:33Z
dc.date.available2016-10-12T10:55:33Z
dc.date.issued2015
dc.identifier.citationSmuts, C.M. et al. 2015. Long-chain n-3 PUFA supplementation decreases physical activity during class time in iron-deficient South African school children. British journal of nutrition, 113:212-224. [http://dx.doi.org/10.1017/S0007114514003493]en_US
dc.identifier.issn0007-1145
dc.identifier.issn1475-2662 (Online)
dc.identifier.urihttp://hdl.handle.net/10394/19044
dc.identifier.urihttp://dx.doi.org/10.1017/S0007114514003493
dc.description.abstractBoth Fe deficiency and poor n-3 fatty acid status have been associated with behavioural changes in children. In the present study, we investigated the effects of Fe and DHA+EPA supplementation, alone or in combination, on physical activity during school days and on teacher-rated behaviour in healthy Fe-deficient school children. In a 2 × 2 factorial design, children (n 98, 6-11 years) were randomly assigned to receive (1) Fe (50 mg) plus DHA (420 mg)+EPA (80 mg), (2) Fe plus placebo, (3) placebo plus DHA+EPA or (4) placebo plus placebo as oral supplements (4 d/week) for 8·5 months. Physical activity was measured during four school days at baseline and endpoint using accelerometers, and data were stratified into morning class time (08.00-10.29 hours), break time (10.30-11.00 hours) and after-break class time (11.01-12.00 hours) for analysis. Classroom behaviour was assessed at endpoint using Conners' Teacher Rating Scales. DHA+EPA supplementation decreased physical activity counts during morning class time, increased sedentary physical activity, and decreased light- and moderate-intensity physical activities. Consistently, DHA+EPA supplementation increased sedentary physical activity and decreased light-intensity physical activity during after-break class time. Even though there were no treatment effects found on teacher-rated behaviour, lower physical activity during morning class time was associated with lower levels of teacher-rated hyperactivity and oppositional behaviour at endpoint. Despite a positive association between Fe status and physical activity during break time at baseline, Fe supplementation did not affect physical activity during break time and class time. Our findings suggest that DHA+EPA supplementation may decrease physical activity levels during class time, and further indicate that accelerometry might be a useful tool to assess classroom behaviour in healthy children.en_US
dc.language.isoenen_US
dc.publisherGeorg Thieme Verlagen_US
dc.subjectfatty acidsen_US
dc.subjectironen_US
dc.subjectphysical activityen_US
dc.subjectbehaviouren_US
dc.subjectschool childrenen_US
dc.titleLong-chain n-3 PUFA supplementation decreases physical activity during class time in iron-deficient South African school childrenen_US
dc.typeArticleen_US
dc.contributor.researchID24054909 - Baumgartner, Jeannine
dc.contributor.researchID20318138 - Greeff, Jani
dc.contributor.researchID20924445 - Smuts, Cornelius Mattheus


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