Imai Daiki, Takeda Ryosuke, Kawai Eriko, Saho Kosuke, Ota Akemi, Morita Emiko, Suzuki Yuta, Yokoyama Hisayo, Okazaki Kazunobu
Research Center for Urban Health and Sports, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan.
Department of Environmental Physiology for Exercise, Osaka Metropolitan University Graduate School of Medicine, 3-3-138 Sugimoto, Sumiyoshi, Osaka, 558-8585, Japan.
Eur J Appl Physiol. 2025 Jul 11. doi: 10.1007/s00421-025-05895-y.
To investigate whether mental fatigue induced by psychological tasks during whole-body surface cooling influences subsequent endurance exercise performance and whether subjective fatigue is associated with performance variability and neuroendocrine responses.
Nine young adults participated in two trials: a mental stress (MS) trial involving the Stroop test (500 stimuli/set × 2) and a control (CON) trial involving watching a video. Both were conducted during whole-body surface cooling using a water-perfused suit (10 °C, 10 min, then 15 °C, 85 min). The time to exhaustion (TE) during cycling at 80% peak oxygen uptake was evaluated. Chalder's fatigue score (CFS), plasma adrenaline ([Ad]), noradrenaline ([Norad]), and cortisol ([Corti]) concentrations were measured before and after intervention and exercise.
After the intervention, the CFS increased in the MS trial, but not in the CON trial. [Ad] and [Norad] remained unchanged after the intervention and increased after exercise in both trials, and an increase with exercise was prominent in the MS trial. [Corti] remained unchanged. TE decreased by 5.7% in the MS trial. However, this was not statistically significant. The difference (Δ) in TE between trials was significantly negatively correlated with ΔCFS (r = - 0.919, P = 0.002). ΔCFS was significantly positively correlated with Δ[Norad] (r = 0.795, P = 0.010), while not with [Ad] or [Corti].
Mental fatigue accompanied by whole-body surface cooling variably influences subsequent endurance exercise performance with decrements associated with greater subjective fatigue and heightened sympathoadrenal-medullary activity though trial-level effects were not significant. There was no apparent hypothalamic-pituitary-adrenal axis involvement.
研究全身表面冷却期间心理任务诱发的精神疲劳是否会影响随后的耐力运动表现，以及主观疲劳是否与表现变异性和神经内分泌反应相关。
九名年轻成年人参与了两项试验：一项精神应激（MS）试验，包括Stroop测试（每组500个刺激×2组）；一项对照（CON）试验，包括观看视频。两项试验均在使用水灌注服进行全身表面冷却期间进行（10°C，10分钟，然后15°C，85分钟）。评估在80%峰值摄氧量下骑行至疲劳的时间（TE）。在干预和运动前后测量Chalder疲劳评分（CFS）、血浆肾上腺素（[Ad]）、去甲肾上腺素（[Norad]）和皮质醇（[Corti]）浓度。
干预后，MS试验中的CFS增加，而CON试验中未增加。干预后[Ad]和[Norad]保持不变，两项试验中运动后均增加，且MS试验中运动后的增加更为显著。[Corti]保持不变。MS试验中TE降低了5.7%。然而，这在统计学上并不显著。试验间TE的差异（Δ）与ΔCFS显著负相关（r = -0.919，P = 0.002）。ΔCFS与Δ[Norad]显著正相关（r = 0.795，P = 0.010），而与[Ad]或[Corti]无关。
全身表面冷却伴随的精神疲劳对随后的耐力运动表现有不同程度的影响，尽管试验水平的影响不显著，但表现下降与更大的主观疲劳和交感肾上腺髓质活动增强有关。下丘脑-垂体-肾上腺轴没有明显参与。
