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Isometric Exercise Combined With Transcranial Electrical Stimulation Improves Conditioned Pain Modulation.

Yinglin Guan1, Xinxin Lin1, Weihong Chen2

  • 1School of Psychology, Shenzhen University, Shenzhen, China.

Annals of the New York Academy of Sciences
|December 24, 2025
PubMed
Summary

Combining transcranial random noise stimulation with direct current offset (tRNS + DC-offset) and exercise enhances pain modulation more than either intervention alone. This combination therapy shows promise for personalized, non-pharmacological pain management.

Keywords:
conditioned pain modulationdescending pain‐inhibitory pathwayexercisepaintranscranial random noise stimulation

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Area of Science:

  • Neuroscience
  • Pain Management
  • Rehabilitation Science

Background:

  • Exercise and primary motor cortex (M1) stimulation may improve pain relief by boosting the body's natural pain inhibition.
  • Conditioned pain modulation (CPM) is a key measure for assessing the efficacy of pain-inhibitory systems.

Purpose of the Study:

  • To investigate if combining exercise with M1-targeted transcranial electrical stimulation offers superior enhancement of CPM compared to individual interventions.
  • To evaluate the efficacy of M1-targeted tRNS + DC-offset and exercise, alone and in combination, on pain modulation.

Main Methods:

  • Two randomized, sham-controlled experiments were conducted.
  • Experiment 1 (N=70) assessed exercise vs. rest.
  • Experiment 2 (N=140) compared M1-targeted tRNS + DC-offset vs. sham, combined with exercise or rest, measuring CPM at baseline, immediately post-, and 30 min post-intervention.

Main Results:

  • Exercise alone did not significantly improve CPM.
  • M1-targeted tRNS + DC-offset significantly enhanced CPM at both post-intervention time points.
  • Individuals with low baseline CPM benefited most from the combined tRNS + DC-offset and exercise, especially at 30 min post-intervention.

Conclusions:

  • Combining M1-targeted tRNS + DC-offset with exercise can optimize endogenous pain inhibition.
  • This combined approach may serve as a personalized, non-pharmacological strategy for individuals with compromised pain modulation.