Immediate effects of photobiomodulation on maximum lip pressure.
Vanessa Mouffron, Renata Maria Moreira Moraes Furlan, Andréa Rodrigues Motta
PMID 35019078WHAT IT FOUND
In 40 adults, a single low-level laser dose of 7 J per point raised maximum lip pressure from 10.60 to 11.90 kPa.
The 1 J and 4 J doses did not show a significant change.
Key findings
01Maximum lip pressure was higher only in the group irradiated with 7 J.
02In the 7 J group, average maximum lip pressure changed from 10.60 kPa to 11.90 kPa, with p = 0.013.
03The 4 J group changed from 11.50 kPa to 12.20 kPa, with p = 0.250; the 1 J group changed from 12.90 kPa to 12.90 kPa, with p = 1.000.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study included only 40 young adults, so it may not apply to patients with oral motor disorders. Participants were recruited by posters and personal invitations, not a random sample. The outcome was a single immediate maximum lip pressure measurement. The study did not measure speech, chewing, swallowing, fatigue, or long-term function. Only one laser application was given, so it does not show effects of a treatment course.
The easy way to misread this
Do not conclude that photobiomodulation improves speech, chewing, or swallowing. This trial measured maximum lip pressure immediately after one laser application. It did not test functional speech or swallowing outcomes, and only the 7 J group had a significant pressure change.