Abstract
Background
Delayed trunk and lower limb muscle activation is associated with balance loss and fall injuries in subjects with recurrent low back pain (LBP).
Purpose
This study was conducted to compare differences in the onset of muscle contractions of the trunk and lower limb muscles following a treadmill-induced step perturbation between subjects with and without LBP.
Methods
Eighty-three right limb dominant individuals (43 subjects with LBP and 40 control subjects) were exposed to the perturbation (0.31 m/s velocity for 0.2 m). The electromyography (EMG) reaction times were analyzed during the first step following the perturbation. The EMG electrodes were placed on both sides of the trunk and lower limbs, including the rectus abdominis (RA), erector spinae (ES), tibialis anterior (TA), and gastrocnemius (GA) muscles.
Results
The group x muscle interaction was statistically significant (F = 9.44, p = 0.003). The TA muscle activation was significantly delayed compared to the RA, ES, and GA. There was a significant interaction on side x muscle (F = 4.14, p = 0.04). The RA muscles were significantly delayed on the non-dominant (t = − 3.35, p = 0.001) and dominant (t = − 2.53, p = 0.01) sides in the LBP group.
Conclusion
The LBP group demonstrated a delayed reaction time on the RA muscles, which indicated poor trunk control relative to the lower limbs. The delayed bilateral RA muscle might indicate possible coordination problems relative to the ES and lower limb muscles, which may lead to potential fall hazards.
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Acknowledgements
The authors thank participants at Central Michigan University and Dr. DC Lee at BioCAT Inc. for his technical assistance for data analyses and contributions to the study. This study was supported by the Scholarship Council, Lilly Faculty Scholarship Award at Indiana Wesleyan University (2573877).
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Sung, P.S., Park, M.S. Delayed response in rectus abdominis muscle following a step perturbation in subjects with and without recurrent low back pain. Eur Spine J 32, 1842–1849 (2023). https://doi.org/10.1007/s00586-023-07639-y
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DOI: https://doi.org/10.1007/s00586-023-07639-y