指屈肌主动不足条件下屈指运动时神经肌肉的调控

doi:10.3969/j.issn.1006-9771.2021.09.017

摘要/Abstract

摘要：

目的观察健康人指屈肌主动不足条件下进行屈指运动时,大脑对肌肉的调控特点。方法 2019年3月,招募健康女性大学生12例,在腕关节中立位和最大屈曲条件下测量右手最大静握力,完成50%最大随意等长收缩屈指运动15次(动力性收缩)。同步采集表面肌电图(sEMG)和脑电图,记录sEMG平均振幅和平均功率频率,以及皮质-肌肉相干性(CMC)。结果腕最大屈曲时握力显著低于腕中立位时(t = 5.757, P < 0.001),指屈肌肌电平均功率频率降低(t = -2.152, P = 0.043)。动力性收缩时,指伸肌肌电平均振幅明显低于指屈肌(t > 2.964, P < 0.01);腕最大屈曲条件下指屈肌平均振幅显著提高(t = 4.135, P < 0.001),CMC升高(t > 2.203, P < 0.05)。结论腕极限屈曲可诱导指屈肌主动不足;在指屈肌主动不足条件下进行屈指运动时,脑相关皮质区活动增强,可能为脑的代偿机制。

关键词: 指屈肌, 主动不足, 神经调控, 表面肌电图, 脑电图, 皮质-肌肉相干性

Abstract:

Objective To observe the characteristics of neuromuscular modulation for fingers flexion under the condition of initiative inadequate of flexor digitorum.Methods In March, 2019, twelve healthy girls in college were recruited. They were measured strength of grip of right hands with the wrist on neutral position and maximum flexion, and finished 15 times of fingers flexion under 50% maximal voluntary isometric contraction (MVC). The surface electromyography (sEMG) and electroencephalography (EEG) were recorded synchronously, and corticomuscular coherence (CMC) was measured.Results The strength of grip decreased as wrist maximum flexion compared with that on neutral position (t = 5.757, P < 0.001), as well as mean power frequency of sEMG (t = -2.152, P = 0.043). For dynamic contraction, sEMG amplitude of flexor digitorum was higher than that of extensor (t > 2.964, P < 0.01); while sEMG amplitude of flexor digitorum was more as wrist maximum flexion (t = 4.135, P < 0.001), as well as the CMC (t > 2.203, P < 0.05).Conclusion Wrist maximum flexion may induce initiative inadequate of flexor digitorum. Cerebral related areas are activated as finger flexion under the condition of initiative inadequate, maybe a kind of compensation.

Key words: flexor digitorum, initiative inadequate, neuromodulation, surface electromyography, electro-encephalography, corticomuscular coherence

张静,郭峰. 指屈肌主动不足条件下屈指运动时神经肌肉的调控[J]. 《中国康复理论与实践》, 2021, 27(9): 1104-1109.

ZHANG Jing,GUO Feng. Neuromodulation for Flexion of Fingers under Initiative Inadequate of Flexor Digitorum[J]. 《Chinese Journal of Rehabilitation Theory and Practice》, 2021, 27(9): 1104-1109.

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部位	n	NDS	IDS	t值	P值
指屈肌	12	7632.5±1405.5	8840.0±1513.6	1.909	0.098
指伸肌	12	7642.3±1323.3	8037.4±1015.4	1.168	0.276
t值		0.014	0.271
P值		0.988	0.798

次数	n	NDS	IDS	t值	P值
1	12	53.3±9.5	42.2±14.3	2.240	0.036
2	12	52.5±9.1	48.2±15.2	0.841	0.410
3	12	51.5±10.0	44.1±13.2	1.548	0.136
4	12	50.2±10.7	45.4±14.6	0.919	0.368
5	12	50.6±12.0	46.2±11.6	0.913	0.371
6	12	51.4±10.5	46.8±11.8	1.009	0.324
7	12	48.6±10.6	47.0±14.5	0.309	0.761
8	12	52.2±10.3	43.2±16.3	1.617	0.120
9	12	49.5±12.9	43.7±11.1	1.181	0.250
10	12	53.4±11.4	44.8±14.5	1.615	0.121
11	12	50.0±10.5	43.8±12.4	1.322	0.200
12	12	49.7±7.2	44.3±13.1	1.251	0.224
13	12	46.7±7.2	45.3±14.0	0.308	0.761
14	12	49.0±6.6	44.5±13.7	1.025	0.316
15	12	49.6±7.7	45.9±12.6	0.868	0.395
F值		0.419	0.166
P值		0.967	1.000

部位	n	NDS	IDS	t值	P值
指屈肌	12	25.1±3.2	49.3±4.9	4.135	< 0.001
指伸肌	12	12.1±3.0	12.4±3.1	-0.069	0.945
t值		2.964	6.364
P值		0.007	< 0.001

条件	Cz	C1	C3
NDS	0.08±0.05	0.10±0.06	0.11±0.06
IDS	0.14±0.08	0.16±0.07	0.18±0.07
t值	2.203	2.254	2.630
P值	0.038	0.035	0.015