Mirka Janssen

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PURPOSE Effects of drafting on the hydrodynamic and metabolic responses of the drafter behind and at the side of a passive and an active lead swimmer were related to the influence of a lead swimmer on the flow field of the draftee. METHODS Passive drag of the draft swimmer was compared for the nondrafting condition, in the drafting conditions behind a(More)
The factors that influence the employment careers of diabetic patients aged 20 to 34 years were studied using a mail questionnaire. The study included all members of the Dutch diabetics association (Diabetes Vereniging Nederland) in that age group. A total of 5987 questionnaires were mailed; 4300 completed questionnaires were returned, giving a response(More)
OBJECTIVES To present the results of the process evaluation of the PLAYgrounds program, using the RE-AIM framework. DESIGN This study provides information regarding Reach, Adoption, Implementation and Maintenance. METHODS The PLAYgrounds program promotes increasing levels of physical activity in 6-12 years old children and was evaluated using the RE-AIM(More)
The aim of this review was to describe the effects of acute bouts of physical activity on attention levels of children. A systematic review was performed of English studies from searches in PubMed, Sportdiscus and PsycINFO from 1990 to (May) 2014 according to the PRISMA statement. Only prospective studies of children aged 4-18 years old were included,(More)
AIMS Worldwide levels of daily physical activity (PA) in children are low. This has negative health consequences. Schools have been recognised as key settings to promote PA. This study evaluates the effectiveness of the playground programme PLAYgrounds on increasing PA. METHODS PLAYgrounds was evaluated by a controlled trial, with a follow-up during one(More)
BACKGROUND The relative number of children meeting the minimal required dose of daily physical activity remains execrably low. It has been estimated that in 2015 one out of five children will be overweight. Therefore, low levels of physical activity during early childhood may compromise the current and future health and well-being of the population, and(More)
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