Am J Public Health 2012 May;102 Suppl 2:S204-6
INSERM, Research Center U-897, Centre de Recherche Épidémiologie et Biostatistique, Injury Prevention and Control research team (Prévention et Prise en Charge des Traumatistmes), Bordeaux, France.
Prevention tools are challenged by risky behaviors that follow their adoption. Speed increase following helmet use adoption was analyzed among bicyclists enrolled in a controlled intervention trial. Speed and helmet use were assessed by video (2621 recordings, 587 participants). Speeds were similar among helmeted and nonhelmeted female cyclists (16.5 km/h and 16.1 km/h, respectively) but not among male cyclists (helmeted: 19.2 km/h, nonhelmeted: 16.8 km/h). Risk compensation, observed only among male cyclists, was moderate, thus unlikely to offset helmet preventive efficacy.