EVIDENCE SPOTLIGHT: Vibroacoustic Stimulation and Insomnia
STUDY OVERVIEW
Insomnia can affect sleep duration, daytime functioning, mood, cognition, and overall quality of life. It is often associated with a persistent state of physiological and neurological hyperarousal.
This randomized pilot study examined whether a one-month program combining vibroacoustic stimulation with nightly auditory stimulation could improve sleep in adults with insomnia and alter functional connectivity in brain regions involved in sleep regulation.
Thirty participants completed the study. Those assigned to the active program showed improvements in insomnia severity and objectively measured sleep duration compared with the waitlist control group. Researchers also observed changes in functional connectivity involving the thalamus, caudate, cerebellum, sensorimotor regions, auditory cortex, nucleus accumbens, and prefrontal cortex.
Because the treatment combined in-clinic vibroacoustic sessions with nightly at-home audio, the study cannot determine how much of the improvement came from the vibration component, the auditory component, or their combined effect.
The researchers used the term “vibroacoustic stimulation” to describe the specific auditory and vibratory intervention tested. This approach falls within the broader area of vibroacoustic therapy, but the study’s terminology is retained because the program combined in-clinic sound-and-vibration sessions with a separate nightly audio component.
STUDY DETAILS
Study Type: Randomized pilot study with a waitlist control group
Participants Who Completed the Study: 30 adults with insomnia
Active Group: 19 participants
Waitlist Control Group: 11 participants
Treatment Duration: One month
In-Clinic Treatment Frequency: Two sessions per week
In-Clinic Session Length: 24 minutes
In-Clinic Stimulation Target: Primarily 8–10 Hz auditory and vibratory stimulation
Vibration Amplitude: 0–5 mm
At-Home Audio Frequency: Nightly
At-Home Audio Length: 60 minutes
Equipment: Theracoustic VibrAcoustic Wellness System 3.0
Primary Focus: Insomnia severity, sleep duration, and brain functional connectivity
Comparison Group: Waitlist control receiving no active treatment during the initial one-month comparison period
WHAT THEY DID
Participants had experienced insomnia for at least three months and met diagnostic criteria for insomnia disorder.
They were randomized in a 2:1 ratio to either the active vibroacoustic program or a waitlist control group.
The active program had two components.
First, participants attended an in-clinic 24-minute vibroacoustic session twice per week for one month. The program delivered sine-wave-based auditory and vibratory stimulation primarily in the 8–10 Hz range through a multichannel system built into a lounge chair.
Second, participants used a 60-minute audio program at home every night while lying in bed. The audio gradually moved from approximately 12 Hz into the theta range and then into the delta range of 1–4 Hz.
Participants completed sleep assessments before and after the one-month program. They also underwent resting-state functional MRI before and after treatment to evaluate changes in brain connectivity.
The waitlist control group completed the same sleep and imaging assessments one month apart but did not receive the active program during that period.
OUTCOMES MEASURED
The researchers measured:
Insomnia severity using the Insomnia Severity Index
Sleep duration using an actigraphy monitor worn for five consecutive nights
Time in bed
Resting-state brain functional connectivity using functional magnetic resonance imaging
Connectivity changes in selected brain regions associated with insomnia, sensory processing, and vibroacoustic stimulation
The targeted brain regions included:
Thalamus
Prefrontal cortex
Parietal lobe
Brain stem
Cerebellar hemispheres
Vermis
Sensorimotor regions
Auditory cortex
Amygdala
Nucleus accumbens
Caudate nucleus
MAJOR FINDINGS
Insomnia severity improved
The active group’s average Insomnia Severity Index score decreased from 13.1 before treatment to 8.6 after treatment. The control group’s average score changed from 12.7 to 11.7.
Using the study’s statistical model, the researchers reported an estimated 3.1-point reduction in the active group, with a significant improvement compared with the control group at p < 0.001.
At the end of the study:
9 of 19 participants in the active group had an Insomnia Severity Index score below 7
3 of 11 participants in the control group had a score below 7
Sleep duration increased
The raw actigraphy averages increased from approximately 431 to 479 minutes per night in the active group. In the control group, average sleep time changed from approximately 467 to 470 minutes.
Using the study’s statistical model, the researchers reported an estimated increase of 30.6 minutes of sleep per night in the active group. This improvement was significant compared with baseline at p = 0.001 and compared with the control group at p < 0.001.
The improvement was not explained simply by spending more time in bed, because changes in time in bed were not significantly different between groups.
ADDITIONAL REPORTED BENEFITS
The researchers also observed significant changes in functional connectivity between several brain regions. These were additional study findings rather than directly reported clinical benefits.
The connectivity changes involved:
The vermis and sensorimotor cortex
The vermis and right auditory cortex
The right thalamus and right caudate
The cerebellar hemispheres and sensorimotor regions
The right nucleus accumbens and right prefrontal cortex
The authors interpreted these changes as evidence that the combined auditory and vibratory program influenced brain networks involved in arousal, sensory processing, movement, reward, and sleep regulation.
However, the study did not establish that these brain changes directly caused the improvement in sleep. It also could not separate brain changes caused by improved sleep from those caused directly by the intervention itself.
CLINICAL IMPLICATIONS
This study suggests that a combined vibroacoustic and auditory stimulation program may offer nonpharmacological support for adults with insomnia.
The findings are clinically relevant because the study included both:
A subjective measure of insomnia severity
An objective measure of sleep duration using actigraphy
Participants in the active group not only reported less severe insomnia but also slept longer.
The neuroimaging findings add another layer of interest by showing changes in brain connectivity after the intervention. These results suggest that auditory and vibratory stimulation may influence neurological pathways associated with sleep and hyperarousal.
Several limitations should be considered:
Only 30 participants completed the study.
The control condition was a waitlist rather than an active placebo or sham treatment.
Participants knew whether they were receiving treatment.
The active group had a lower average sleep duration at baseline, leaving more room for improvement.
The intervention combined in-clinic vibroacoustic stimulation with nightly audio, so their individual effects cannot be separated.
The study lasted only one month.
There was no longer-term follow-up.
Sleep architecture was not measured using polysomnography or EEG.
The study did not determine whether improvements continued after treatment stopped.
The findings should therefore be considered encouraging but preliminary.
RELEVANCE TO SICKLE CELL SUPPORT
This study did not involve people with sickle cell disease. It was selected because sleep disruption and insomnia can affect comfort, energy, coping, mood, and daily functioning in people living with chronic illness and recurrent pain.
For individuals with sickle cell disease, poor sleep may interact with fatigue, pain burden, stress, and reduced daytime function. A noninvasive intervention that supports relaxation and sleep duration could therefore be relevant to broader supportive-care goals.
This study found improvements in insomnia severity and objectively measured sleep duration after a combined vibroacoustic and auditory program. Those findings support further investigation of VAT-related approaches for sleep support in people living with sickle cell disease.
However, the study does not show that vibroacoustic stimulation treats sickle cell disease, prevents pain crises, or improves sleep specifically in the sickle cell population. Research involving people with sickle cell disease is still needed.
WHY IT MATTERS
Sleep is not simply a secondary wellness concern. Poor sleep can affect pain perception, emotional regulation, cognition, energy, and the ability to manage daily life.
This study is important because it went beyond self-reported relaxation. Researchers measured sleep duration with actigraphy and examined brain connectivity using functional MRI.
The active group showed improvement in both perceived insomnia severity and measured sleep time, while also demonstrating changes in brain networks associated with sleep and sensory regulation.
At the same time, the combined intervention makes the results more difficult to interpret. The study provides evidence for the full program, not for vibroacoustic stimulation alone.
Even with that limitation, it offers meaningful preliminary support for further research into vibroacoustic and rhythmic sensory approaches for sleep disturbance.
PUBLICATION & RESEARCH ACCESS
Study: An fMRI Study of the Effects of Vibroacoustic Stimulation on Functional Connectivity in Patients with Insomnia
Authors: George Zabrecky, Shiva Shahrampour, Cutler Whitely, Mahdi Alizadeh, Chris Conklin, Nancy Wintering, Karl Doghramji, Tingting Zhan, Feroze Mohamed, Andrew Newberg, and Daniel Monti
Journal: Sleep Disorders
Year: 2020
Article ID: 7846914
Pages: 9
Study Classification: Randomized pilot study with a waitlist control group
DOI: 10.1155/2020/7846914
Institution: Thomas Jefferson University, Philadelphia, Pennsylvania
Funding: Marcus Foundation
Research Access: Open-access full-text article