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首页> 外文期刊>Biomedical signal processing and control >Lumbar erector spinae and sacral multifidus contractile properties in healthy females and males as determined by laser displacement mechanomyography
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Lumbar erector spinae and sacral multifidus contractile properties in healthy females and males as determined by laser displacement mechanomyography

机译：通过激光置换机械能谱法测定的健康女性和男性的腰直肌脊柱和多裂肌收缩特性

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Introduction: To investigate mechanomyography's (MMG) applicability to characterise the contractile properties of muscles in the low back of healthy subjects.Methods: Healthy female and male subjects (mean +/- standard deviation, 25.7 +/- 9.6 years, BMI 21.8 +/- 3.1 kg/m(2), n = 32) were studied with laser displacement mechanomyography (LDS MMG). The protocol consisted of MMG muscle evaluations over the 10 lumbar facet joints, as well as two bilateral sites over the sacrum, whilst subjects maintained lumbar flexion.Results: Mixed-effects model analyses with Sidak's post hoc were used for statistical analysis. Muscle contraction time (Tc), half-relaxation time (1/2Tr) and sustain time (Ts) showed no significant (p 0.05) differences between segments or sides. No significance (p 0.05) was found for muscle displacement (Dmax), contraction velocity (Vc) and 1/2 relaxation velocity (1/2Vr) between sides for the same vertebral segment. However, Dmax and Vc showed both left- and right-side differences (p 0.05) between L1/L2 and MT (and L5/S1 for Vc), L2/L3 and L5/S1-MT (and L4/L5 for Vc), L3/L4 and L5/S1-MT, L4/L5 and MT. 1/2Vr also varied (p 0.05) between L2/L3 and MT, L3/L4 and MT. No significance was obtained for gender differences at each site for any MMG variable (p 0.05).Conclusions: Contractile properties of the lumbosacral spine appear predominantly homogeneous, with no difference between sides (Tc, 1/2Tr, Ts). However, muscle displacement (Dmax) and contraction velocities (Vc, 1/2Vr) did vary between cephalic and caudal vertebral levels. This may be attributed to the difference in muscular CSA between the segments. As a preliminary analysis, gender appears to have no effect but requires future investigation. (C) 2018 Elsevier Ltd. All rights reserved.
机译：简介：研究机械X线照相法（MMG）在表征健康受试者腰背肌肉收缩特性方面的适用性方法：健康女性和男性受试者（平均+/-标准偏差，25.7 +/- 9.6岁，BMI 21.8 + / -3.1千克/平方米（2），n = 32）是通过激光位移机械分析法（LDS MMG）研究的。该方案包括对10个腰椎小关节的MMG肌肉评估以及the骨上的两个双侧部位的评估，而受试者保持了腰部屈曲。结果：采用Sidak's post hoc的混合效应模型分析进行统计分析。肌肉收缩时间（Tc），半松弛时间（1 / 2Tr）和维持时间（Ts）在节段或侧面之间无显着差异（p> 0.05）。对于同一椎骨节段，两侧之间的肌肉位移（Dmax），收缩速度（Vc）和1/2松弛速度（1 / 2Vr）没有显着性（p> 0.05）。但是，Dmax和Vc在L1 / L2和MT（对于Vc为L5 / S1），L2 / L3和L5 / S1-MT（对于Vc为L4 / L5）之间显示左右差异（p <0.05） ），L3 / L4和L5 / S1-MT，L4 / L5和MT。 L2 / L3和MT，L3 / L4和MT之间的1 / 2Vr也变化（p <0.05）。对于任何MMG变量，每个部位的性别差异均无统计学意义（p> 0.05）。结论：腰部脊柱的收缩特性似乎是均匀的，两侧之间无差异（Tc，1 / 2Tr，Ts）。但是，头顶和尾椎水平之间的肌肉位移（Dmax）和收缩速度（Vc，1 / 2Vr）确实有所不同。这可能归因于各段之间肌肉CSA的差异。作为初步分析，性别似乎没有影响，但需要进一步调查。 （C）2018 Elsevier Ltd.保留所有权利。

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