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首页> 外文期刊>Neuroscience: An International Journal under the Editorial Direction of IBRO >INCREASED CROSS-EDUCATION OF MUSCLE STRENGTH AND REDUCED CORTICOSPINAL INHIBITION FOLLOWING ECCENTRIC STRENGTH TRAINING
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INCREASED CROSS-EDUCATION OF MUSCLE STRENGTH AND REDUCED CORTICOSPINAL INHIBITION FOLLOWING ECCENTRIC STRENGTH TRAINING

机译：偏心力量训练后，增加肌肉力量的交叉训练和降低肋骨后壁抑制

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Aim: Strength training of one limb results in a substantial increase in the strength of the untrained limb, however, it remains unknown what the corticospinal responses are following either eccentric or concentric strength training and how this relates to the cross-education of strength. The aim of this study was to determine if eccentric or concentric unilateral strength training differentially modulates corticospinal excitability, inhibition and the cross-transfer of strength. Methods: Changes in contralateral (left limb) concentric strength, eccentric strength, motor-evoked potentials, short-interval intracortical inhibition and silent period durations were analyzed in groups of young adults who exercised the right wrist flexors with either eccentric (N = 9) or concentric (N = 9) contractions for 12 sessions over 4 weeks. Control subjects (N = 9) did not train. Results: Following training, both groups exhibited a significant strength gain in the trained limb (concentric group increased concentric strength by 64% and eccentric group increased eccentric strength by 62%) and the extent of the cross-transfer of strength was 28% and 47% for the concentric and eccentric group, respectively, which was different between groups (P = 0.031). Transcranial magnetic stimulation revealed that eccentric training reduced intracortical inhibition (37%), silent period duration (15-27%) and increased corticospinal excitability (51%) compared to concentric training for the untrained limb (P = 0.033). There was no change in the control group. Conclusion: The results show that eccentric training uniquely modulates corticospinal excitability and inhibition of the untrained limb to a greater extent than concentric training. These findings suggest that unilateral eccentric contractions provide a greater stimulus in cross-education paradigms and should be an integral part of the rehabilitative process following unilateral injury to maximize the response. (C) 2015 IBRO. Published by Elsevier Ltd. All rights reserved.
机译：目的：对一个肢体进行力量训练会导致未经训练的肢体力量显着增加，但是，目前尚不清楚偏心或同心力量训练后皮质脊髓反应如何，以及这与力量的交叉教育有何关系。这项研究的目的是确定偏心或同心单边力量训练是否不同地调节皮质脊髓兴奋性，抑制和强度的交叉转移。方法：分析了在偏心锻炼者中右腕屈肌（N = 9）组的对侧（左肢）同心力量，偏心力量，运动诱发电位，短时皮质内抑制和静默期持续时间的变化。或同心（N = 9）收缩，持续4周，共12次。对照组（N = 9）没有训练。结果：训练后，两组训练后的肢体均显示出明显的力量增加（同心组使同心力增加了64％，偏心组使偏心力增加了62％），并且强度的交叉传递程度分别为28％和47同心和偏心组分别为％，这在组之间是不同的（P = 0.031）。经颅磁刺激显示，与未经训练的肢体同心训练相比，偏心训练减少了皮质内抑制（37％），沉默期持续时间（15-27％）并增加了皮质脊髓兴奋性（51％）。对照组没有变化。结论：结果表明，与同心训练相比，偏心训练在更大程度上独特地调节了皮质脊髓兴奋性和对未训练肢体的抑制。这些发现表明，单侧偏心收缩在跨教育范式中提供了更大的刺激，并且应该是单侧损伤后康复过程中不可或缺的一部分，以最大程度地提高反应速度。 （C）2015年IBRO。由Elsevier Ltd.出版。保留所有权利。

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