Department of Health Sciences -Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Department of Health Sciences -Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, SP, Brazil.
Clin Biomech (Bristol). 2021 Feb;82:105276. doi: 10.1016/j.clinbiomech.2021.105276. Epub 2021 Jan 23.
Despite previous reports supporting cervical muscle weakness and altered motor control in migraine, the endurance under standardized submaximal loads has not been investigated. Therefore, this study aimed to assess the endurance and muscle activity of the cervical musculature during submaximal isometric contractions in women with migraine and those without headache.
Cervical muscle endurance tests were performed for flexors and extensors at 25%, 50%, and 75% of the output force during maximal isometric contraction using the Multi-Cervical Rehabilitation Unit with customized biofeedback. Initial values and relative rates of changes in root mean square and median frequency were calculated using cervical muscle superficial electromyography.
Women with chronic migraine presented significantly shorter flexor endurance time in all load tests than controls (25%, P = .001, 50%, P = .005; 75%, P = .013), while episodic migraine only differed from controls at 75% (P = .018). The frequency of neck pain and/or pain referred to the head after the endurance test was up 12% in the control group, 40% in the episodic migraine group and 68% of the chronic migraine group. Few differences between groups were observed in the electromyographic variables and none of them was related to a worse performance in the endurance tests.
Cervical flexor endurance was reduced in women with chronic migraine when independent of the load, whereas it was reduced to 75% of the maximal force in those with episodic migraine. No difference in the electromyographic variables could be related to this reduced flexor endurance. Also, no differences were detected in extensors endurance.
尽管先前有研究报告支持偏头痛患者存在颈部肌肉无力和运动控制改变，但尚未对其在标准亚极限负荷下的耐力进行研究。因此，本研究旨在评估偏头痛女性和无头痛女性在最大等长收缩时，进行 25%、50%和 75%输出力的亚极限等长收缩时，颈部肌肉的耐力和肌肉活动。
使用定制生物反馈的多颈椎康复单元，对颈椎屈肌和伸肌进行等长耐力测试，测量在最大等长收缩时的 25%、50%和 75%的输出力。使用颈椎表面肌电图计算均方根和中位数频率的初始值和相对变化率。
慢性偏头痛女性在所有负荷测试中，屈肌耐力时间均明显短于对照组（25%，P = 0.001，50%，P = 0.005；75%，P = 0.013），而发作性偏头痛仅在 75%时与对照组存在差异（P = 0.018）。在耐力测试后，对照组的颈部疼痛和/或头痛频率增加了 12%，发作性偏头痛组增加了 40%，慢性偏头痛组增加了 68%。在肌电图变量方面，各组之间观察到的差异很小，且均与耐力测试的表现恶化无关。
慢性偏头痛女性的颈椎屈肌耐力在独立于负荷的情况下降低，而发作性偏头痛女性的屈肌耐力降低至最大力的 75%。肌电图变量的差异与屈肌耐力的降低无关。也未检测到伸肌耐力的差异。
