Ferraz DD, Trippo KV, Duarte GP, Neto MG, Bernardes Santos KO, Filho JO The Effects of Functional Training, Bicycle Exercise, and Exergaming on Walking Capacity of Elderly Patients With Parkinson Disease: A Pilot Randomized Controlled Single-blinded Trial. Arch Phys Med Rehabil. 2018 May;99(5):826-833. doi: 10.1016/j.apmr.2017.12.014. Epub 2018 Jan 11.
Gupta DK, Fahn S, Tatsuoka C, Kang UJ Hoehn and Yahr stage 3 and postural stability item in the movement disorder society-unified Parkinson's disease rating scale. Mov Disord. 2018 Jul;33(7):1188-1189. doi: 10.1002/mds.27453.
Khan S, Nabi G, Naeem M, Ali L, Silburn PA, Mellick GD A door-to-door survey to estimate the prevalence of Parkinsonism in Pakistan. Neuropsychiatr Dis Treat. 2016 Jun 21;12:1499-506. doi: 10.2147/NDT.S86329. eCollection 2016.
Santos P, Machado T, Santos L, Ribeiro N, Melo A Efficacy of the Nintendo Wii combination with Conventional Exercises in the rehabilitation of individuals with Parkinson's disease: A randomized clinical trial. NeuroRehabilitation. 2019;45(2):255-263. doi: 10.3233/NRE-192771.
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.
