Effect of interferential current on deep abdominal muscle thickness.
Ayumu Endo, Akihiro Yakabi, Akira Kubo
PMID 35400830WHAT IT FOUND
Interferential current at 2.5 kHz modulated to 20 Hz significantly increased transverse abdominis muscle thickness in healthy men, outperforming other frequency combinations.
This specific setting caused the greatest thickening compared to rest and other conditions, suggesting a precise parameter for deep abdominal activation.
Key findings
01The 2.5 kHz carrier frequency modulated at 20 Hz produced the largest increase in transverse abdominis thickness, significantly greater than rest and other stimulation conditions.
02All three measured abdominal muscles (transverse abdominis, internal oblique, and external oblique) showed significant thickness changes during interferential current stimulation.
03Stimulation at 5.0 kHz did not produce significant thickness increases in the transverse abdominis compared to the resting state.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only healthy male participants, so results may not apply to women or individuals with existing back pain or muscle dysfunction. The study measured muscle thickness, which is a structural change, but did not assess functional outcomes like pain reduction or stability. The authors noted that it was unclear if the stimulation penetrated deep tissues to recruit fibers effectively, as significant differences in thickness change among the three muscles were not found. The study did not compare interferential current to low-frequency rectangular pulsed current, so it is unclear if interferential current offers specific advantages over other electrical stimulation methods.
Declared interests
The authors declared no financial or personal relationships that could bias the study.
The easy way to misread this
Do not interpret the increase in muscle thickness as proof that this electrical stimulation improves core stability or reduces pain in patients. The study only measured structural changes in healthy men and did not test functional outcomes or clinical symptoms.