Stability of Motor Output in Aging Adults
Corticobulbar Motor Output in Aging Adults
Studienübersicht
Status
Status
Bedingungen
Bedingungen
Detaillierte Beschreibung
A large number of our nation's veterans develop dysphagia due to the myriad of potential etiological sources of swallowing disorders, including stroke and head and neck cancer. The Veteran's Health Administration has recently identified dysphagia as a major clinical focus for the VA system (Sullivan & Dennis, 2006). In order to accurately assess adaptations in motor cortex, it is first necessary to have a reliable tool for measuring organizational representation in the motor cortex. Transcranial magnetic stimulation (TMS) is a desirable choice for such measurement because of the ability to identify causative relationships between an area of motor cortex stimulated and muscle response. Therefore, the specific research objectives of this proposal are:
- To demonstrate the reproducibility of TMS mapping of the submental muscle group in healthy older adults between 60 and 80 years of age
- To determine the neural representation of submental musculature in the motor cortex of healthy older adults between 60 and 80 years of age.
Twenty healthy adults, 10 men and 10 women, between the ages of 60 and 80 years will serve as research participants. TMS will be used to establish motor maps of the submental muscles. Subjects will undergo two testing sessions, on day 1 and day 14. The results from each session will be compared to assess excitability and representation within the motor cortex, and to assess stability and reliability of measurement.
Studientyp
Studientyp
Einschreibung (Tatsächlich)
Einschreibung
Kontakte und Standorte
Studienorte
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Florida
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Gainesville, Florida, Vereinigte Staaten, 32608
- North Florida/South Georgia Veterans Health System
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Teilnahmekriterien
Zulassungskriterien
Zulassungskriterien
Studienberechtigtes Alter
Akzeptiert gesunde Freiwillige
Studienberechtigte Geschlechter
Probenahmeverfahren
Studienpopulation
Beschreibung
Inclusion Criteria:
- Between 60 and 80 years of age
Exclusion Criteria:
- History of dysphagia
- History of neurologic disease
- History of head or neck cancer
- History of stroke
- Untreated hypertension
- History of a heart condition or heart disease
- Currently pregnant
Contraindication to TMS including:
- Metallic hardware on the scalp in the area where TMS will be applied
- Cardiac pacemaker
- Implanted medication pumps or an intracardiac line
- Prior diagnosis of seizure or epilepsy in the subject (childhood history of benign febrile seizure will not be a contraindication)
- Poorly controlled migraine headaches
- Previous brain neurosurgery
- Medications that can lower seizure threshold (Appendix B)
- Unstable medical conditions
- Lowest motor thresholds above 80% on TMS
Studienplan
Wie ist die Studie aufgebaut?
Designdetails
Anzahl der Gruppen / Kohorten
Kohorten und Interventionen
Gruppe / KohorteGruppe / Kohorte |
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1
20 healthy participants between 60 and 80 years of age.
Ten men and 10 women.
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Was misst die Studie?
Primäre Ergebnismessungen
Primäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Mean Motor Evoked Potential Amplitude for Submental Cortical Representation
Zeitfenster: 2 weeks
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Cortical sites are stimulated sequentially from the SOLMT in the anterior direction.
At each site, 5 pulses of 110% of the MEP threshold obtained at the SOLMT are delivered and recorded.
If a site produces no MEP in 3/5 pulses it is considered non-submental.
This process is continued until the entire submental representation is surrounded by non-submental responsive sites.
The number of sites is used to calculate the area of submental representation.
The mean sEMG amplitudes of the submental muscles for each of these sites is then calculated for the mean MEP measure.
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2 weeks
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Sekundäre Ergebnismessungen
Sekundäre Ergebnismessungen
Ergebnis Maßnahme |
Maßnahmenbeschreibung |
Zeitfenster |
|---|---|---|
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Motor Map Center of Gravity
Zeitfenster: 2 weeks
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Position on the TMS motor map with highest amplitude response to stimulation in the muscles of interest (submental muscles).
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2 weeks
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Area of Submental Representation
Zeitfenster: 2 weeks
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Cortical sites are stimulated sequentially from the SOLMT in the anterior direction.
At each site, 5 pulses of 110% of the MEP threshold obtained at the SOLMT are delivered and recorded.
If a site produces no MEP in 3/5 pulses it is considered non-submental.
This process is continued until the entire submental representation is surrounded by non-submental responsive sites.
The number of sites is used to calculate the area of submental representation.
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2 weeks
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Mitarbeiter und Ermittler
Sponsor
Sponsor
Ermittler
Ermittler
- Hauptermittler: Karen Hegland, PhD, North Florida/South Georgia Veterans Health System
Studienaufzeichnungsdaten
Haupttermine studieren
Studienbeginn
Studienbeginn
Primärer Abschluss (Tatsächlich)
Primärer Abschluss
Studienabschluss (Tatsächlich)
Studienabschluss
Studienanmeldedaten
Zuerst eingereicht
Zuerst eingereicht
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst eingereicht, das die QC-Kriterien erfüllt hat
Zuerst gepostet (Schätzen)
Zuerst gepostet
Studienaufzeichnungsaktualisierungen
Letztes Update gepostet (Schätzen)
Letztes Update gepostet
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Letztes eingereichtes Update, das die QC-Kriterien erfüllt
Zuletzt verifiziert
Zuletzt verifiziert
Mehr Informationen
Begriffe im Zusammenhang mit dieser Studie
Schlüsselwörter
Andere Studien-ID-Nummern
Andere Studien-ID-Nummern
- C6697-M
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