Journal
JOURNAL OF BACK AND MUSCULOSKELETAL REHABILITATION
Volume 34, Issue 4, Pages 631-637Publisher
IOS PRESS
DOI: 10.3233/BMR-200298
Keywords
Infraspinatus muscle; rotator cuff muscles; electrical stimulation; transcranial magnetic stimulation; motor evoked potential
Categories
Funding
- JSPS KAKENHI [18K17725, 19K19835, 20H01140, 15K16360, 1962-1]
- Ibaraki Prefectural University of Health Sciences
- Grants-in-Aid for Scientific Research [20H01140, 19K19835, 15K16360, 18K17725] Funding Source: KAKEN
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This study investigated the immediate effects of NMES on the corticospinal excitability of the infraspinatus muscle in healthy subjects. The results showed that NMES significantly increased the MEP amplitude of the muscle without affecting Mmax, suggesting that NMES can increase CST excitability without producing immediate changes in neuromuscular junction or muscle hypertrophy.
BACKGROUND: Rotator cuff muscles are structurally and functionally different from other upper-limb muscles because they are responsible for glenohumeral joint stability. Neuromuscular electrical stimulation (NMES) induces excitability changes (increase or decrease) of the corticospinal tract (CST) in the peripheral muscles, such as those of the finger. However, it remains unclear whether similar results are obtained when targeting the infraspinatus muscle, which has properties that differ from other muscles, in healthy subjects. OBJECTIVE: We investigated the immediate effects of NMES on the corticospinal excitability of the infraspinatus muscle, a rotator cuff muscle, in healthy subjects. METHODS: Thirteen healthy right-handed men (mean age: 26.77 +/- 2.08 years) participated in this study. The motor evoked potentials (MEPs) and the maximum compound muscle action potential (Mmax) were recorded before NMES to the right infraspinatus and within 15 minutes after the end of the NMES. RESULTS: NMES on the infraspinatus muscle significantly increased its MEP amplitude (Pre: 0.45 mV [0.33-0.48]; Post: 0.54 mV [0.46-0.60] (median [lower quartile to higher quartile]); p = 0.005) but had no effect on Mmax (Pre: 2.95 mV [2.59-4.71]; Post: 3.35 mV [2.76-4.72]; p = 0.753). CONCLUSIONS: NMES application to the infraspinatus muscle increases CST excitability without producing immediate changes in the neuromuscular junction or muscle hypertrophy.
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