Deception of cycling distance on pacing strategies, perceptual responses, and neural activity
Deception of cycling distance on pacing strategies, perceptual responses, and neural activity
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骑行距离对配速策略、感知反应和神经活动的欺骗
DOI：
10.1007/s00424-018-2218-9
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发表时间：
2018
期刊：
影响因子：
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通讯作者：
M. Skein
中科院分区：
文献类型：
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作者：
G. Wingfield;F. Marino;M. Skein
运动过程中的起搏已经得到了很好的证实；然而，关于与功率输出变化相关的神经反应以及运动终点知识的影响，人们知之甚少。因此，这项研究的目的是检验骑行距离的欺骗对起搏、脑氧合(O2Hb)和脱氧血红蛋白浓度以及α(α)波活动的影响。10名训练有素的男性自行车运动员(23.7 ± 6.6年)在固定的空气制动自行车测功器上完成了3次自行车时间试验(TT)，并被告知本研究旨在检验3 × 30公里TT的可靠性。参与者在不知情的情况下以随机顺序完成了三个距离(24，30和36公里)。在每个TT中记录表现(功率输出；PO)、生理(心率；HR)、知觉(感觉到的劳累程度；RPE)和神经(O2Hb、HHb和α活动)的测量。数据被转换为相对于覆盖的总距离的百分比。在100%完成时，与30公里试验相比，36公里试验期间的HR和PO较低(P≤ 0.01)。与24公里试验相比，α波减少了100%(效应大小；Es = 1.01)，而O2Hb在36公里试验(Es = 1.39)完成70%时更大。36公里的RPE也高于80%的30公里试验和10%和40-100%完成率的24公里试验(P≤ 0.02)。我们的结论是，在36公里的试验中，O2Hb和RPE的增加，而HR和PO的下降，可能表明当被持续时间终点欺骗时，前额叶皮质可能通过增加对努力减少生理应激早发的感知而影响运动成绩的调节。
Pacing during exercise performance is well-established; however, little is known about the neural responses associated with changes in power output and the effect of exercise end-point knowledge. Therefore, the aim of this study was to examine the effect of deception of cycling distance on pacing, cerebral oxy- (O2Hb) and deoxy-haemoglobin concentrations, and alpha (α) wave activity. Ten well-trained male cyclists (23.7 ± 6.6 years) completed three cycling time trials (TT) on a stationary air-braked cycle ergometer and were informed the study was to examine the reliability of 3 × 30-km TT. Participants unknowingly completed three distances (24, 30, and 36 km) in a randomised order. Performance (power output; PO), physiological (heart rate; HR), perceptual (rating of perceived exertion; RPE), and neurological (O2Hb, HHb, and α activity) measures were recorded throughout each TT. Data were converted to a percentage relative to the total distance covered. At 100% completion, HR and PO were lower during the 36 km compared to the 30 km trial (P≤ 0.01). Compared to the 24 km trial, α waves were reduced at 100% (effect size; ES = 1.01), while O2Hb was greater at 70% of completion in the 36 km trial (ES = 1.39). RPE was also higher for 36 km compared to 30-km trial at 80% and the 24-km trial at 10% and 40–100% of completion (P≤ 0.02). We conclude that the increase in O2Hb and RPE during the 36-km trial, while a reduction in HR and PO is present, may indicate that the pre-frontal cortex may influence the regulation of exercise performance when deceived of the duration end-point by increasing perception of effort to reduce premature onset of physiological strain.