Physiological Flow of Liquids Used in Dysphagia Management


People with neurodegenerative diseases such as Parkinson’s Disease or Amyotrophic Lateral Sclerosis often report difficulties with
swallowing, and thickened liquids are commonly recommended to manage swallowing problems. This study will help us to better understand swallowing impairment and how liquid thickness influences swallowing function. You will be asked to participate in tongue strength measurements and a swallowing x-ray study.


The purpose of this research study is to identify the factors which place individuals with neurodegenerative conditions at risk for unsafe swallowing (i.e.,food or liquids entering the airway, known as aspiration) or post-swallow residue(i.e., material remaining in the throat after the swallow). This study is a one-time visit that will last about 1 hour.


Adults (18+) with a confirmed diagnosis of Parkinson's disease (PD)

For additional study information, please contact Kelby Magennis:


18 to 65
65 and over



Monetary compensation


Can be done from home



Parkinson disease, Parkinson's disease, Parkinson's disease - resources, Neurology

Principal Investigator

Emily K. Plowman, PhD, CCC-SLP



Contact Information

(352) 273-9725

Be an Informed Participant

Before deciding to participate in a research study, take time to learn about clinical research, how it's conducted and your rights as a research participant. Following are some helpful resources from independent sources. Always remember that a clinical research study is research, not treatment.

Know Who to Contact

  • Eligibility: For questions about a specific study and who is eligible to participate, call or email the contact person listed for that study.
  • Your Rights: For questions about your rights as a research participant, contact the UF Institutional Review Boards at 352-273-9600.
  • Feedback: For general questions or feedback about study listings, email the UF Clinical and Translational Science Institute at

Other Resources

  • HealthStreet: Health-focused services, classes and events, and opportunities to participate in research.
  • Join a national registry of volunteers willing to be contacted about research studies.

For Research Teams