Evidence map›Paper›PMID 41730580›Full record

ArticleAnnals of rehabilitation medicine2026

Assessment of Back Muscle Activity Using High-Density Surface Electromyography in Patients With Degenerative Thoracolumbar Kyphosis: A Preliminary Study.

Yuki Kurokawa, Yuichi Nishikawa, Noriaki Yokogawa, Takaki Shimizu, Satoru Demura, Satoshi Kato

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Article in Annals of rehabilitation medicine, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.

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5 · Who and what money

Authors and funding

6 authors.

Yuki KurokawaDepartment of Health Sciences, Major in Rehabilitation Science, Physical Therapy Program, Nagoya City University, Nagoya, Japan.
Yuichi NishikawaFaculty of Frontier Engineering, Institute of Science and Engineering, Kanazawa University, Kanazawa, Japan.
Noriaki YokogawaDepartment of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.
Takaki ShimizuDepartment of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.
Satoru DemuraDepartment of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.
Satoshi KatoDepartment of Orthopaedic Surgery, Kanazawa University Graduate School of Medical Sciences, Kanazawa, Japan.

Funding

Japanese Society for Musculoskeletal Medicine
6 · The paper itself

Abstract

Objective: To examine back muscle activity and fatigue behavior in female patients with degenerative thoracolumbar kyphosis (DTK) using high-density surface electromyography (HDSEMG) and evaluate the effects of using a soft spinal orthosis.

methodsSeven female participants with DTK (mean age: 73.6 years) were assessed during static standing and a weighted holding task with and without a soft spinal orthosis. HDSEMG signals were obtained from the lumbar erector spinae using a 64-electrode array. Time to fatigue (TTF), spatial displacement, and directional consistency of muscle activation were analyzed using the spatial center of activity (SCoA) and circular variance (CV).

resultsOrthosis use significantly reduced the sagittal vertical axis and low back pain. TTF was significantly prolonged during the weighted holding task with the orthosis (p=0.012), indicating delayed fatigue onset. SCoA displacement was significantly reduced in both tasks (p<0.001), whereas CV analysis demonstrated improved directional consistency of muscle activation. Conclusion: HD-SEMG revealed early fatigue onset and unstable muscle activation patterns in patients with DTK, particularly during load-bearing tasks performed without orthotic support. Orthosis used improved endurance and neuromuscular efficiency by reducing spatial and directional variability in muscle recruitment. These findings underscore the utility of HDSEMG for elucidating the neuromuscular pathophysiology of DTK and support the use of spinal orthoses as a conservative treatment approach.

Indexed as

ElectromyographyKyphosisMuscle fatigueOrthotic devices

Identifiers

PMID41730580
PMCPMC12961340

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