Alpha and beta/low-gamma frequency bands may have distinct neural origin and function during post-stroke walking.

IF 1.7 4区 医学 Q4 NEUROSCIENCES Experimental Brain Research Pub Date : 2024-10-01 Epub Date: 2024-08-06 DOI:10.1007/s00221-024-06906-8
Charalambos C Charalambous, Mark G Bowden, Jing Nong Liang, Steven A Kautz, Avgis Hadjipapas
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Abstract

Plantarflexors provide propulsion during walking and receive input from both corticospinal and corticoreticulospinal tracts, which exhibit some frequency-specificity that allows potential differentiation of each tract's descending drive. Given that stroke may differentially affect each tract and impair the function of plantarflexors during walking; here, we examined this frequency-specificity and its relation to walking-specific measures during post-stroke walking. Fourteen individuals with chronic stroke walked on an instrumented treadmill at self-selected and fast walking speed (SSWS and FWS, respectively) while surface electromyography (sEMG) from soleus (SOL), lateral gastrocnemius (LG), and medial gastrocnemius (MG) and ground reaction forces (GRF) were collected. We calculated the intermuscular coherences (IMC; alpha, beta, and low-gamma bands between SOL-LG, SOL-MG, LG-MG) and propulsive impulse using sEMG and GRF, respectively. We examined the interlimb and intralimb IMC comparisons and their relationships with propulsive impulse and walking speed. Interlimb IMC comparisons revealed that beta LG-MG (SSWS) and low-gamma SOL-LG (FWS) IMCs were degraded on the paretic side. Intralimb IMC comparisons revealed that only alpha IMCs (both speeds) exhibited a statistically significant difference to random coherence. Further, alpha LG-MG IMC was positively correlated with propulsive impulse in the paretic limb (SSWS). Alpha and beta/low-gamma bands may have a differential functional role, which may be related to the frequency-specificity of the underlying descending drives. The persistence of alpha band in plantarflexors and its strong positive relationship with propulsive impulse suggests relative alteration of corticoreticulospinal tract after stroke. These findings imply the presence of frequency-specific descending drives to walking-specific muscles in chronic stroke.

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在中风后行走过程中,α和β/低γ频带可能具有不同的神经起源和功能。
足底反射器在行走过程中提供推动力,并接收来自皮质脊髓束和皮质神经脊髓束的输入,这些神经束表现出一定的频率特异性,从而有可能区分每个神经束的下降驱动力。鉴于中风可能会对每条神经束产生不同的影响,并损害步行时足底反射器的功能;在此,我们研究了这种频率特异性及其与中风后步行时步行特异性测量的关系。14 名慢性中风患者在带仪器的跑步机上以自选速度和快走速度(分别为 SSWS 和 FWS)行走,同时收集比目鱼肌(SOL)、外侧腓肠肌(LG)和内侧腓肠肌(MG)的表面肌电图(sEMG)和地面反作用力(GRF)。我们使用 sEMG 和 GRF 分别计算了肌间连贯性(IMC;SOL-LG、SOL-MG、LG-MG 之间的α、β 和低γ 带)和推进冲力。我们研究了肢间和肢内 IMC 比较及其与推进冲力和步行速度的关系。肢间 IMC 比较显示,瘫痪侧的β LG-MG(SSWS)和低伽马 SOL-LG (FWS)IMC 下降。肢内 IMC 比较显示,只有阿尔法 IMC(两种速度)与随机相干性有显著的统计学差异。此外,α LG-MG IMC 与瘫痪肢体(SSWS)的推进冲力呈正相关。α波段和β/低γ波段可能具有不同的功能作用,这可能与基础降序驱动的频率特异性有关。跖反射器中阿尔法波段的持续存在及其与推进冲动的强烈正相关性表明,中风后皮质脊髓束发生了相对改变。这些研究结果表明,慢性中风患者的步行肌肉存在频率特异性下降驱动。
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来源期刊
CiteScore
3.60
自引率
5.00%
发文量
228
审稿时长
1 months
期刊介绍: Founded in 1966, Experimental Brain Research publishes original contributions on many aspects of experimental research of the central and peripheral nervous system. The focus is on molecular, physiology, behavior, neurochemistry, developmental, cellular and molecular neurobiology, and experimental pathology relevant to general problems of cerebral function. The journal publishes original papers, reviews, and mini-reviews.
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