Background: Cardiovascular risk factors are associated with physical fitness and, to a lesser extent, physical activity. Lifestyle interventions directed at enhancing physical fitness in order to decrease the risk of cardiovascular diseases should be extended. To enable the development of effective lifestyle …

During the past decade there has been a huge increase in the number of internet users, this has among other things resulted in a high growth of online networks. Many network providers are trying to attract new members, the competition is fierce. Therefore the purpose of this study was to investigate …

The Internet and computers increasingly determine our daily lives. This goes for almost everyone in the Netherlands. Still, it is mostly teenagers who are well informed on how to use all the possibilities of new technologies. They are building a digital world of their own that parents usually know very …