Document Type

Article

Publication Date

11-9-2019

Abstract

Objective

To examine how insertion and presence of intramuscular fine‐wire electromyography electrodes (IFWE) in lumbar multifidus affect paraspinal muscle strength, endurance, and activation in persons with and without recurrent lower back pain (RLBP) during activities that require high levels of muscle contraction.

Design

Case‐control with randomization of conditions.

Setting

Clinical Research Laboratory.

Participants

Forty participants age 18‐40 were recruited (18 female; mean age = 25.5 yr); 20 with a history of RLBP were compared to a matching control group of 20 without RLBP.

Interventions

Each participant was tested under three conditions over three sessions. On Session 1, the baseline condition, we assessed muscle performance without IFWE insertion. On Sessions 2 and 3, participants were randomly alternated between two experimental conditions: a) wire‐in, in which the IFWE was inserted and remained within the muscle during testing, and b) wire‐out, in which the IFWE was inserted and immediately removed.

Main Outcome Measures

Lumbar spinal extensor peak strength, endurance, and normalized EMG amplitude during the endurance test.

Results

Individuals with RLBP showed a significant decrease in peak strength during conditions that involved IFWE insertion and tend to experience more pain during muscle testing. Both groups exhibited similar levels of performance and muscle activation during the endurance test.

Conclusion

Our findings indicate that individuals with RLBP exhibited reduced lumbar extensor strength in response to IFWE insertion to the deep paraspinal muscles. This behavior is different from those without RLBP. Researchers should carefully consider the use of IFWE electromyography in individuals with RLBP during high exertion activities.

Comments

This is the accepted version of the following article:

Lee S-P, Dinglasan V, Duong A, Totten R, Smith JA. Individuals with recurrent low back pain exhibit significant changes in paraspinal muscle strength after intramuscular fine wire electrode insertion. PM&R.

which has been published in final form at https://doi.org/10.1002/pmrj.12284. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Peer Reviewed

1

Copyright

Wiley

Available for download on Monday, November 09, 2020

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