速度滑冰运动员抽筋的肌肉间连贯性

介绍： 滑冰运动员的抽筋是速度滑冰专家的一种职业生涯终结的运动障碍，被认为是一种特定于任务的肌张力障碍。在其他运动障碍中，包括任务特异性肌张力障碍，研究发现中枢失调的证据表示为更高的肌肉间连贯性。我们研究了受影响的滑冰运动员的肌肉间连贯性是否更高，作为其由中枢驱动的可能指标，并进一步证明它是一种任务特异性肌张力障碍。

方法： 在 14 名受影响的滑冰者和 14 名对照滑冰者中，我们计算了固定任务中θ带中的肌肉间相干性，其中强直肌激活在最大自愿收缩的 10%、20% 和 50% 处测量。此外，我们还计算了在划水周期的关键时刻滑冰时的小波相干性。

结果： 连贯性在固定激活任务中没有差异。在滑冰时，与未受冲击的腿相比，受影响滑冰者的受影响腿的连贯性更高，p = .05，η2= 0.031，肌电图振幅与阻生腿的相干性相关，p = .009，R2调整= 0.41。与对照组的左腿和右腿相比，受严重影响的滑冰运动员亚组（n = 6）在受影响的腿上具有更高的连贯性，p = .02，Cohen的d = 1.59和p = .01，Cohen的d = 1.63。整个受影响队列的结果不太清楚，可能是由于病例组合不同。

结论： 我们在某些严重的滑冰运动员痉挛病例中具有更高的连贯性的结果是中枢失调的初步证据，这使得它是特定于任务的肌张力障碍的可能性更高。

关键字： 肌 张力 障碍;肌肉间连贯性;速度滑冰。

Parkinsonism Relat Disord

. 2022 Dec 19;107:105250.

 doi: 10.1016/j.parkreldis.2022.105250. Online ahead of print.

Inter-muscular coherence in speed skaters with skater's cramp

B Nijenhuis 1, M A J Tijssen 2, T van Zutphen 3, J van der Eb 4, E Otten 5, J W Elting 2

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• PMID: 36563538

•  

• DOI: 10.1016/j.parkreldis.2022.105250

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Abstract

Introduction: Skater's cramp is a career-ending movement disorder in expert speed skaters noted to be a likely task-specific dystonia. In other movement disorders, including task-specific dystonia, studies have found evidence of central dysregulation expressed as higher inter-muscular coherence. We looked at whether inter-muscular coherence was higher in affected skaters as a possible indicator that it is centrally driven, and by extension further evidence it is a task-specific dystonia.

Methods: In 14 affected and 14 control skaters we calculated inter-muscular coherence in the theta-band in a stationary task where tonic muscle activation was measured at 10%, 20% and 50% of maximum voluntary contraction. Additionally, we calculated wavelet coherence while skating at key moments in the stroke cycle.

Results: Coherence did not differ in the stationary activation task. While skating, coherence was higher in the impacted leg of affected skaters compared to their non-impacted leg, p = .05, η2 = 0.031, and amplitude of electromyography correlated with coherence in the impacted leg, p = .009, R2adjusted = 0.41. A sub-group of severely affected skaters (n = 6) had higher coherence in the impacted leg compared to the left and right leg of controls, p = .02, Cohen's d = 1.59 and p = .01, Cohen's d = 1.63 respectively. Results were less clear across the entire affected cohort probably due to a diverse case-mix.

Conclusion: Our results of higher coherence in certain severe cases of skater's cramp is preliminary evidence of a central dysregulation, making the likelihood it is a task-specific dystonia higher.

Keywords: Dystonia; Inter-muscular coherence; Speed skating.