Scientific breakthrough in Sweden may help with loud snoring

By Stephen Beech

Loud snoring could be reduced thanks to a high-tech breakthrough.

Scientists in Sweden have developed a 3D model of the upper airway — complete with dynamic airflows, soft tissues and sound generation.

It revealed the physical mechanism that keeps many people awake at night.

The loudest sounds resulted from unsteady airflow across the soft tissues of the mouth, according to the findings published in the journal Physics of Fluids.

The research team says the discovery could eventually lead to anti-snoring solutions.

An entire industry of products, technologies and treatments currently claim to cure or prevent loud snoring, with varying degrees of success.

Most previous scientific research into snoring was aimed at treating sleep apnea, a serious and potentially life-threatening condition distinct from ordinary snoring.

But snoring not caused by sleep apnea can still be debilitating for the snorer — and for the people who have to put up with them.

Scientists are still unsure exactly how the sound produced by snoring is generated, which inhibits their ability to prescribe solutions.

Now, researchers from the KTH Royal Institute of Technology in Stockholm have developed a 3D model of the upper airway.

Their goal was to understand how the various elements relate to each other.

Study author Peng Li said: "Many existing studies simplify breathing or neglect the interaction between airflow, tissue motion, and sound generation.

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"We hope to better understand how breathing drives snoring and identify the dominant sound generation mechanisms."

He explained that if you touch the roof of your mouth, directly behind your teeth, you'll feel a rigid, almost bony surface.

That is the hard palate, which extends for several inches into the back of your mouth.

But, further back, the hard surface gives way to a smoother, more spongy texture called the soft palate.

That soft tissue was the focus of the team's analysis.

Using their computational model, the researchers re-created the environment of the upper airway, simulating the movement of air through the mouth and watching closely for any sound-producing vibrations.

Li, a Ph.D. candidate, said: "Our results suggest that reducing soft palate vibration or unsteady aerodynamic loading may help reduce palatal snoring.

"This could inform evaluation of palatal stiffening procedures or other interventions that modify tissue mechanics or airflow."

While their model can reveal the mechanics behind snoring, the researchers say it is still too simplified to offer detailed recommendations for preventing it.

For that, the team is now planning to expand the simulation to incorporate effects from possible treatment options.

Li said: "Our next step is to investigate how palatal stiffness affects its vibration and the resulting snoring sound."

He added: "By systematically varying tissue stiffness, we aim to determine how it changes oscillation amplitude, dominant frequency, airflow patterns, and acoustic source strength.

"This may clarify how palatal stiffening treatments reduce vibration and identify mechanical conditions that could reduce palatal snoring."