AME2P, Université Clermont Auvergne, Clermont-Ferrand, France.
LAMHESS, Université Côte d'Azur, Nice, France.
Int J Dev Neurosci. 2021 May;81(3):270-276. doi: 10.1002/jdn.10099. Epub 2021 Feb 28.
The aim of the present study was to check whether the M-wave and H-reflex recruitment curves differ between prepubertal boys and men. Eleven boys (9-11 yr) and eleven men (18-35 yr) were magnetically stimulated at the tibial nerve in a prone position. M-wave and H-reflex maximal amplitudes (H M ; H /M ), thresholds, regression slopes (H ; M ; H /M ) were extracted from M-wave and H-reflex recruitment curves and compared between the two age groups. Overall, no significant difference in M-wave and H-reflex recruitment curve parameters was found between the two populations. Nevertheless, the size of the M-wave associated with maximal H-reflex amplitude was lower in boys as compared to men when expressed relative to maximal M-wave amplitude (M /M : 0.18 ± 0.06 vs. 0.31 ± 0.13; p < .05). This result suggests that the development of peripheral nerve was completed in 9 to 11-year-old boys and did not affect the M-wave and H-reflex recruitment curves parameters. In neuromuscular function studies, it implies that H /M and H /M could be used indifferently to compare spinal motoneuron excitability between 9-11-year-old boys and men. Conversely, evoking H-reflexes at a given percentage of M may bias the comparison between boys and men.
本研究旨在检查青春期前男孩和成年男性的 M 波和 H 反射募集曲线是否存在差异。11 名男孩（9-11 岁）和 11 名成年男性（18-35 岁）在俯卧位时接受胫骨神经的磁刺激。从 M 波和 H 反射募集曲线中提取 M 波和 H 反射最大幅度（H M ；H /M ）、阈值、回归斜率（H ；M ；H /M ），并在两个年龄组之间进行比较。总体而言，两个群体之间的 M 波和 H 反射募集曲线参数没有显著差异。然而，与最大 M 波幅度相比，最大 H 反射幅度相关的 M 波幅度在男孩中低于成年男性（M /M ：0.18 ± 0.06 比 0.31 ± 0.13；p < 0.05）。这一结果表明，外周神经在 9 至 11 岁男孩中已经发育完全，不会影响 M 波和 H 反射募集曲线参数。在神经肌肉功能研究中，这意味着 H /M 和 H /M 可以被同等用于比较 9-11 岁男孩和成年男性的脊髓运动神经元兴奋性。相反，在给定 M 的百分比下引发 H 反射可能会影响男孩和成年男性之间的比较。
