Horne PJ, Hardman CA, Lowe CF, Rowlands AV Increasing children's physical activity: a peer modelling, rewards and pedometer-based intervention. Eur J Clin Nutr. 2009 Feb;63(2):191-8. Epub 2007 Sep 19.
Jones RA, Okely AD, Caputi P, Cliff DP Perceived and actual competence among overweight and non-overweight children. J Sci Med Sport. 2010 Nov;13(6):589-96. doi: 10.1016/j.jsams.2010.04.002. Epub 2010 Jul 2.
Willms JD, Tremblay MS, Katzmarzyk PT Geographic and demographic variation in the prevalence of overweight Canadian children. Obes Res. 2003 May;11(5):668-73.
Increasing Self-efficacy and VO2 Max Scores in Obese Adolescents: a Peer Modeling Intervention
Interventional studies are often prospective and are specifically tailored to evaluate direct impacts of treatment or preventive measures on disease.
Observational studies are often retrospective and are used to assess potential causation in exposure-outcome relationships and therefore influence preventive methods.
Expanded access is a means by which manufacturers make investigational new drugs available, under certain circumstances, to treat a patient(s) with a serious disease or condition who cannot participate in a controlled clinical trial.
Clinical trials are conducted in a series of steps, called phases - each phase is designed to answer a separate research question.
Phase 1: Researchers test a new drug or treatment in a small group of people for the first time to evaluate its safety, determine a safe dosage range, and identify side effects.
Phase 2: The drug or treatment is given to a larger group of people to see if it is effective and to further evaluate its safety.
Phase 3: The drug or treatment is given to large groups of people to confirm its effectiveness, monitor side effects, compare it to commonly used treatments, and collect information that will allow the drug or treatment to be used safely.
Phase 4: Studies are done after the drug or treatment has been marketed to gather information on the drug's effect in various populations and any side effects associated with long-term use.
