Background

Most studies focus on the effects of a single remote ischemic preconditioning (RIPC) session on performance. However, the training-like effect of repeat RIPC sessions performed on consecutive days could potentially be even more beneficial to neuromuscular performance than a single RIPC session. Therefore, aim of the study was to assess the impact of 10 days of RIPC on local neuromuscular performance.

Methods

Thirty-seven male participants performed 10 days of either RIPC or sham-controlled condition. Before and after procedure, the maximal voluntary contraction and muscle fatigue were assessed by dynamometry and surface electromyography (EMG) of the isometric extension of the knee joint. The following neuromuscular outcomes were investigated: peak torque (PKTQ); rate of force development (RTD); time to failure; and the slope of median frequency of power spectrum (MDF) and EMG amplitude.

Results

After RIPC, while there was no change in PKTQ and time to failure, the late RTD and MDF slope were significantly affected. The RTD at 0–100 and 0–200 ms showed 24 and 16% increase, respectively, while the MDF slope showed 24% decrease in rectus femoris.

Conclusions

10 days of RIPC induced neuromuscular performance changes in the quadriceps muscle. Even though there were no changes in task to failure performance, RIPC showed EMG changes limited to rectus femoris and increased late RTD in MVC task.

中文翻译：

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连续 10 天远程缺血预处理对局部神经肌肉功能的影响

背景

大多数研究侧重于单个远程缺血预处理 (RIPC) 会话对性能的影响。然而，连续几天重复进行 RIPC 训练的类似训练效果可能比单次 RIPC 训练更有利于神经肌肉表现。因此，该研究的目的是评估 10 天的 RIPC 对局部神经肌肉性能的影响。

方法

三十七名男性参与者进行了 10 天的 RIPC 或假控制条件。在手术前后，通过膝关节等长伸展的测力计和表面肌电图 (EMG) 评估最大随意收缩和肌肉疲劳。研究了以下神经肌肉结果：峰值扭矩 (PKTQ)；力发展率（RTD）；失败时间；以及功率谱中频 (MDF) 和 EMG 幅度的斜率。

结果

RIPC 后，虽然 PKTQ 和失效时间没有变化，但后期 RTD 和 MDF 斜率受到显着影响。0-100 和 0-200 ms 的 RTD 分别增加了 24% 和 16%，而 MDF 斜率显示股直肌减少了 24%。

结论

10 天的 RIPC 诱导了股四头肌的神经肌肉性能变化。即使任务失败表现没有变化，RIPC 显示 EMG 变化仅限于股直肌，并且在 MVC 任务中增加了晚期 RTD。