Systematic Evaluation of the Effects of Voluntary Activation on Lower Extremity Motor Thresholds.
Systematic Evaluation of the Effects of Voluntary Activation on Lower Extremity Motor Thresholds.
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DOI：
10.3390/jcm12185993
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发表时间：
2023-09-15
影响因子：
3.9
通讯作者：
Kindred JH
中科院分区：
文献类型：
--
作者：
Cash JJ;Bowden MG;Boan AD;McTeague LM;Kindred JH
本研究旨在探讨静息运动阈（rMT）与活动运动阈（aMT）之间的关系。在四种下肢肌肉激活状态下测量的MT进行了横截面比较：静息、5%最大随意收缩（MVC）、10%MVC和站立。在中风慢性期（>6个月）的参与者（n = 11）和健康对照组的优势肢体（n = 11）中，测量了病变同侧和对侧肢体胫骨前肌的MT。为了比较不同的激活水平，除了传统的0.05 mV rMT标准（rMT 50）外，还使用每个参与者在10%MVC + 2SD下测量的平均峰-峰背景肌电图（EMG）活动对反应进行标准化。在所有参与者中，随着肌肉激活增加，MT的最小二乘均值估计值降低（对侧：p = 0.008;同侧：p = 0.0015，健康优势：p < 0.0001）。在健康对照组中，rMT 50与所有其他MT有显著差异（p < 0.0344），而在卒中中，两条肢体无差异（p > 0.10）。这项研究强调了rMT和aMT之间的关系，这一点很重要，因为许多卒中幸存者不存在rMT，需要使用aMT。未来的工作可能会考虑使用的标准化标准，占背景EMG活动的激活水平。
The purpose of this investigation was to elucidate the relationship between the resting motor threshold (rMT) and active motor threshold (aMT). A cross-sectional comparison of MTs measured at four states of lower extremity muscle activation was conducted: resting, 5% maximal voluntary contraction (MVC), 10%MVC, and standing. MTs were measured at the tibialis anterior in the ipsilesional and contralesional limbs in participants in the chronic phase (>6 months) of stroke (n = 11) and in the dominant limb of healthy controls (n = 11). To compare across activation levels, the responses were standardized using averaged peak-to-peak background electromyography (EMG) activity measured at 10%MVC + 2SD for each participant, in addition to the traditional 0.05 mV criterion for rMT (rMT50). In all participants, as muscle activation increased, the least square mean estimates of MTs decreased (contralesional: p = 0.008; ipsilesional: p = 0.0015, healthy dominant: p < 0.0001). In healthy controls, rMT50 was significantly different from all other MTs (p < 0.0344), while in stroke, there were no differences in either limb (p > 0.10). This investigation highlights the relationship between rMT and aMTs, which is important as many stroke survivors do not present with an rMT, necessitating the use of an aMT. Future works may consider the use of the standardized criterion that accounted for background EMG activity across activation levels.
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