Background: Activity trackers can potentially stimulate users to increase their physical activity behavior. The aim of this study was to examine the reliability and validity of ten consumer activity trackers for measuring step count in both laboratory and free-living conditions. Method: Healthy adult …

Monitoring (physical) stress in professional fire fighters. It is important to measure physical performance and stress of people with physically demanding professions. This will prevent (too) high physical strain and stress that leads to a negative influence on decision-making which ultimately may causes …

In a double-masked randomized controlled crossover study we investigated both the retinal responses to straylight, and the effects of lens cleaners on straylight values, in two different RGP contact lens materials. Methods: Thirty patients (20-59 years) wearing RGP lenses were refitted with new lenses …