Saunders Elizabeth, Clark Brian C, Clark Leatha A, Grooms Dustin R
Division of Athletic Training, School of Applied Health Sciences and Wellness, College of Health Sciences and Professions, Ohio University, Athens, OH, 45701, United States of America.
Physical Therapy and Sports Medicine Centers, New London, CT, 06320, United States of America.
Transl Neurosci. 2020 Jun 1;11(1):193-200. doi: 10.1515/tnsci-2020-0116. eCollection 2020.
The purpose of this study was to quantify head motion between isometric erector spinae (ES) contraction strategies, paradigms, and intensities in the development of a neuroimaging protocol for the study of neural activity associated with trunk motor control in individuals with low back pain. Ten healthy participants completed two contraction strategies; (1) a supine upper spine (US) press and (2) a supine lower extremity (LE) press. Each contraction strategy was performed at electromyographic (EMG) contraction intensities of 30, 40, 50, and 60% of an individually determined maximum voluntary contraction (MVC) (±10% range for each respective intensity) with real-time, EMG biofeedback. A cyclic contraction paradigm was performed at 30% of MVC with US and LE contraction strategies. Inertial measurement units (IMUs) quantified head motion to determine the viability of each paradigm for neuroimaging. US vs LE hold contractions induced no differences in head motion. Hold contractions elicited significantly less head motion relative to cyclic contractions. Contraction intensity increased head motion in a linear fashion with 30% MVC having the least head motion and 60% the highest. The LE hold contraction strategy, below 50% MVC, was found to be the most viable trunk motor control neuroimaging paradigm.
本研究的目的是在制定一项神经成像方案的过程中，对等长竖脊肌（ES）收缩策略、模式和强度之间的头部运动进行量化，该神经成像方案用于研究与腰痛患者躯干运动控制相关的神经活动。10名健康参与者完成了两种收缩策略：（1）仰卧位上脊柱（US）按压和（2）仰卧位下肢（LE）按压。每种收缩策略均在肌电图（EMG）收缩强度为个体确定的最大自主收缩（MVC）的30%、40%、50%和60%（每个相应强度的±10%范围）下进行，并采用实时EMG生物反馈。在30%MVC下，对US和LE收缩策略采用循环收缩模式。惯性测量单元（IMU）对头部运动进行量化，以确定每种模式用于神经成像的可行性。US与LE等长收缩在头部运动方面无差异。与循环收缩相比，等长收缩引起的头部运动明显更少。收缩强度以线性方式增加头部运动，30%MVC时头部运动最少，60%MVC时头部运动最多。研究发现，MVC低于50%时的LE等长收缩策略是最可行的躯干运动控制神经成像模式。
