Background

The central governor model putatively explains the mechanism of endurance exercise-induced central fatigue, however high-intensity exercise-induced central fatigue strategies have not been investigated yet. This study aimed to examine how central fatigue affects neural response alterations, as measured by electroencephalographic (EEG) recordings, in intermittent high-intensity cycling.

Methods

Neural responses were assessed by measuring the alteration of brainwaves based on spectral energy band estimates during an intermittent, high-intensity, 60-min exercise bout on a cycle ergometer. The cycle ergometer incline was changed every 10 min in an intermittent pattern (10-20-5-20-5-10°). EEG was used to analyze altering brain function. Heart rate (HR), blood lactate (BL), and rating of perceived exertion (RPE) were measured after the participants completed each change in incline.

Results

The results showed that HR, BL, and RPE increased at an incline of 20° in comparison to a 5° incline. The spectral power of EEG was significantly increased (P ˂ 0.01) in the alpha and beta frequency ranges with a change in inclines between 5 and 20°. The spectral power of the EEG was significantly increased (P ˂ 0.01) over the whole frequency range from rest (theta + 251%, alpha + 165%, beta + 145%).

Conclusion

Higher, relative intensities (10 and 20°) increased brain function, regardless of fatigue occurrence. HIIT (high-intensity interval training) led to an alteration in the neural response. Further work investigating the usefulness of HIIT to improve brain function is warranted.

中文翻译：

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间歇性高强度自行车引起的中枢疲劳期间的脑功能

 背景

中央调速模型推测解释了耐力运动引起的中枢疲劳的机制，但高强度运动引起的中枢疲劳策略尚未得到研究。本研究旨在探讨间歇性高强度骑行中中枢疲劳如何影响神经反应改变（通过脑电图 (EEG) 记录测量）。

 方法

通过在自行车测力计上进行间歇性、高强度、60 分钟的运动期间根据光谱能带估计来测量脑电波的变化来评估神经反应。自行车测力计倾斜度每 10 分钟以间歇模式 (10-20-5-20-5-10°) 改变一次。脑电图用于分析大脑功能的改变。在参与者完成每次倾斜变化后，测量心率（HR）、血乳酸（BL）和感知用力等级（RPE）。

 结果

结果显示，与倾斜 5° 相比，倾斜 20° 时 HR、BL 和 RPE 有所增加。 EEG 的频谱功率在 α 和 β 频率范围内显着增加（ P ˂ 0.01），倾斜度变化在 5 至 20° 之间。 EEG 的频谱功率在整个休息频率范围内显着增加（ P ˂ 0.01）（θ + 251%、α + 165%、β + 145%）。

 结论

无论是否发生疲劳，较高的相对强度（10 和 20°）都会增强大脑功能。 HIIT（高强度间歇训练）导致神经反应发生变化。有必要进一步研究 HIIT 对改善大脑功能的有用性。