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.

中文翻译：

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用于神经影像学的躯干运动范式的开发

本研究的目的是量化等距竖脊肌 (ES) 收缩策略、范式和强度之间的头部运动，用于研究与腰痛个体躯干运动控制相关的神经活动的神经影像学协议的开发。10 名健康参与者完成了两种收缩策略；(1) 仰卧上脊柱 (US) 推举和 (2) 仰卧下肢 (LE) 推举。每种收缩策略均以单独确定的最大自主收缩 (MVC) 的 30、40、50 和 60% 的肌电图 (EMG) 收缩强度（每个相应强度的 ±10% 范围）进行，并具有实时 EMG 生物反馈。使用 US 和 LE 收缩策略在 MVC 的 30% 处执行循环收缩范例。惯性测量单元 (IMU) 量化头部运动，以确定每个神经成像范式的可行性。US vs LE 保持收缩导致头部运动没有差异。与周期性收缩相比，保持收缩引起的头部运动明显减少。收缩强度以线性方式增加头部运动，30% MVC 的头部运动最少，60% 的最高。低于 50% MVC 的 LE 保持收缩策略被发现是最可行的躯干运动控制神经影像学范例。