Noise-Enhanced Sensory Function in Elders at Risk for Falls

Aging Clinical Trial

Official title:

Noise-Enhanced Sensory Function in Elders at Risk for Falls

Clinical Trial Details — Status: Unknown status

Administrative data

• NCT number: NCT00421759
• Other study ID #: AG0072
• Secondary ID: 5P01AG004390-230
• Status: Unknown status
• Phase: N/A
• First received: January 10, 2007
• Last updated: December 10, 2009
• Start date: April 2006
• Est. completion date: January 2009

Study information

• Verified date: August 2008
• Source: National Institute on Aging (NIA)
• Contact: Ted Gruen
• Phone: 617-363-8554
• Email: gruen[@]hrca.harvard.edu
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

The long-term goal of this project is to develop a non-invasive, noise-based technique for enhancing somatosensation and thereby improving balance control in elderly fallers and older adults with somatosensory deficits.

Description:

Previous studies have shown that sub-sensory mechanical noise (i.e., random vibration with a small intensity) can enhance somatosensory function in healthy individuals and older adults with somatosensory deficits. Moreover, the postural sway of both healthy young and healthy elderly individuals during quiet standing can be significantly reduced by applying sub-sensory mechanical noise to the feet using vibrating shoe insoles.

The specific aims of this project are to determine the effects of noise-enhanced somatosensation at the feet on balance performance in elderly individuals with somatosensory deficits and/or recurrent falls, and to assess whether adaptation occurs in noise-enhanced balance control in these individuals. To accomplish these aims, quiet-standing and dynamic posture studies and clinical balance assessments will be conducted on elderly individuals with somatosensory deficits and elderly individuals with recurrent falls (two or more falls over a 12-month period).

This project could lead to the development of a novel bioengineering technique for improving balance control in older adults and patients with somatosensory deficits. The work could thus serve to reduce the frequency, morbidity and cost of falling, and assist aged individuals in achieving maximal independence in activities of daily living and mobility.

Two groups of participants will be recruited from the RNH Epidemiology Core: 85 elderly individuals with somatosensory deficits, and 85 elderly individuals with recurrent falls. The study consists of three visits--a one-hour neurological exam, and two 6-hour laboratory testing sessions scheduled one week apart.

Recruitment information / eligibility

• Status: Unknown status
• Enrollment: 170
• Est. completion date: January 2009
• Est. primary completion date: January 2009
• Accepts healthy volunteers: No
• Gender: All
• Age group: 70 Years and older

Eligibility

Inclusion Criteria:

• Participant must (1) have somatosensory deficit (mild to moderate sensory loss on the bottom of both feet) OR (2) be classified as a recurrent faller (two or more incident falls over a twelve-month period not related to syncope, major medical events, or overwhelming external hazards)

• Age 70 and older

• Able to stand unassisted for at least 60 seconds several times over a 30-minute period

• Able to walk without assistance from a walking aid

Exclusion Criteria:

• Known history of seizures or fainting

• Unstable medical condition

• Open lesions or poor skin condition on feet

• Unable to cooperate with or understand the protocol

• Foot size larger or smaller than the constructed vibrating insoles (men's sizes smaller than 3 or larger than 12; women's sizes smaller than 4.5 or larger than 13.5)

Related Conditions & MeSH terms

• Aging
• Somatosensory Deficit

Intervention

Device:
• Vibrating Insoles
Participants wear vibrating sandals for 3 trials of 6 minutes, during a single lab visit. The sandal vibration is on during either first or second 3 minutes of the 6 minute trial, as they walk. Also, participants wear the sandals for 2 hours while sitting, with vibrations on for one visit and off for the other.

Locations

Country	Name	City	State
United States	Applied Biodynamics Laboratory, Boston University	Boston	Massachusetts

Sponsors (1)

Lead Sponsor	Collaborator
National Institute on Aging (NIA)

Country where clinical trial is conducted

United States, 

References & Publications (5)

Kiemel T, Oie KS, Jeka JJ. Multisensory fusion and the stochastic structure of postural sway. Biol Cybern. 2002 Oct;87(4):262-77. — View Citation

Laughton CA, Slavin M, Katdare K, Nolan L, Bean JF, Kerrigan DC, Phillips E, Lipsitz LA, Collins JJ. Aging, muscle activity, and balance control: physiologic changes associated with balance impairment. Gait Posture. 2003 Oct;18(2):101-8. — View Citation

Liu W, Lipsitz LA, Montero-Odasso M, Bean J, Kerrigan DC, Collins JJ. Noise-enhanced vibrotactile sensitivity in older adults, patients with stroke, and patients with diabetic neuropathy. Arch Phys Med Rehabil. 2002 Feb;83(2):171-6. — View Citation

Priplata A, Niemi J, Salen M, Harry J, Lipsitz LA, Collins JJ. Noise-enhanced human balance control. Phys Rev Lett. 2002 Dec 2;89(23):238101. Epub 2002 Nov 13. — View Citation

Priplata AA, Niemi JB, Harry JD, Lipsitz LA, Collins JJ. Vibrating insoles and balance control in elderly people. Lancet. 2003 Oct 4;362(9390):1123-4. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Area ellipse of sway		Three 6-minute trials in one visit, repeated one week later
Primary	Berg Functional Balance Scales		Three 6-minute trials in one visit, repeated one week later
Primary	Timed Up and Go (TUG)Test		Three 6-minute trials in one visit, repeated one week later
Primary	Timed one-legged stance test		Three 6-minute trials in one visit, repeated one week later
Primary	Gait timing variability		Three 6-minute trials in one visit, repeated one week later
Secondary	Changes in: stabilogram-diffusion analysis (SDA)		Three 6-minute trials in one visit, repeated one week later
Secondary	Neurological risk factors related to falls		Three 6-minute trials in one visit, repeated one week later