What causes loss of muscle mass in primary sarcopenia: A MUNIX analysis and correlation with plasma biomarkers.

IF 2.1 4区医学 Q3 CLINICAL NEUROLOGY

Acta neurologica Belgica Pub Date : 2025-08-27 DOI:10.1007/s13760-025-02873-1

Aysegul Akkan Suzan, Seyda Bilgin, Pelin Degirmenci, Nurten Uzun Adatepe, Alper Doventas, Aysegul Gunduz

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引用次数: 0

Abstract

Introduction: To determine if the loss of muscle mass in primary sarcopenia is secondary to motor neuron loss or directly related to muscle fiber loss using electrophysiological methods.

Methods: We recruited individuals with primary sarcopenia and non-sarcopenic individuals of similar age and gender for the study. After a detailed evaluation of geriatric syndromes and neurological disorders through systemic, neurological, and electrophysiological examinations, we recorded the motor unit number index (MUNIX) and motor unit size index (MUSIX) of the first dorsal interosseus (FDI) and tibialis anterior (TA) muscles in all participants.

Results: Individuals with sarcopenia exhibited reduced FDI MUNIX and lower TA CMAP amplitude and MUNIX values. The FDI MUNIX showed an inverse correlation with ferritin levels.

Discussion: Primary sarcopenia is characterized by motor unit loss without significant reinnervation. Motor unit loss in individuals with sarcopenia can be demonstrated in both the upper and lower extremities using the MUNIX method, and functional iron deficiency contributes to the etiology of primary sarcopenia.

Conclusion: Demonstration of motor unit loss in primary sarcopenia supports the hypothesis that the disease has a neuromuscular origin.

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原发性肌肉减少症患者肌肉质量减少的原因：一项MUNIX分析及其与血浆生物标志物的相关性

前言：利用电生理方法确定原发性肌肉减少症患者的肌肉质量损失是继发于运动神经元损失还是与肌纤维损失直接相关。方法：我们招募了年龄和性别相似的原发性肌肉减少症患者和非肌肉减少症患者。在通过全身、神经学和电生理检查对老年综合征和神经系统疾病进行详细评估后，我们记录了所有参与者的第一背骨间肌（FDI）和胫骨前肌（TA）的运动单位数指数（MUSIX）和运动单位大小指数（MUSIX）。结果：骨骼肌减少症患者表现为FDI MUNIX降低，TA CMAP振幅和MUNIX值降低。FDI MUNIX与铁蛋白水平呈负相关。讨论：原发性肌肉减少症的特征是运动单元丧失，没有明显的神经再生。肌肉减少症患者的运动单位丧失可以通过munx方法在上肢和下肢得到证实，功能性铁缺乏有助于原发性肌肉减少症的病因学。结论：原发性肌肉减少症的运动单位丧失支持了该疾病有神经肌肉起源的假设。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Acta neurologica Belgica 医学-临床神经学

CiteScore

4.20

自引率

3.70%

发文量

300

审稿时长

6-12 weeks

期刊介绍： Peer-reviewed and published quarterly, Acta Neurologica Belgicapresents original articles in the clinical and basic neurosciences, and also reports the proceedings and the abstracts of the scientific meetings of the different partner societies. The contents include commentaries, editorials, review articles, case reports, neuro-images of interest, book reviews and letters to the editor. Acta Neurologica Belgica is the official journal of the following national societies: Belgian Neurological Society Belgian Society for Neuroscience Belgian Society of Clinical Neurophysiology Belgian Pediatric Neurology Society Belgian Study Group of Multiple Sclerosis Belgian Stroke Council Belgian Headache Society Belgian Study Group of Neuropathology