Hyperthermia-induced decline in cognitive performance is a moderate complication that poses challenges to the maintenance of safety. Although the underlying mechanism can be attributed to the disruption of brain netwo...Hyperthermia-induced decline in cognitive performance is a moderate complication that poses challenges to the maintenance of safety. Although the underlying mechanism can be attributed to the disruption of brain networks, the propensity remains unclear. This study aimed to test the hypothesis that the extent of the alterations in cognitive performance is governed by the activity of deep brain structures, including monoaminergic neural systems. A decline in cognitive performance during mild hyperthermia and the beneficial effects of neck cooling were demonstrated using the Continuous Performance Test as a battery of cognitive tasks. Aspects of cognitive performance were characterized using the deep-brain activity (DBA) index as a neural activity parameter and the State-Trait Anxiety Inventory to assess the extent of alterations in cognitive performance as an individual measure. It was found that a higher average DBA index during tasks is essential for high cognitive performance in the heat. This beneficial effect of DBA is governed by the upper brainstem. This DBA benefit is more significant for individuals with higher average DBA indices at rest in a normal environment. Individual differences in cognitive performance in the heat are governed by differences in DBA. In addition, the beneficial effect of DBA on cognitive performance in heat only applies under conditions including neck cooling. This limited neck-cooling effect is attributed to anti-homeostatic thermoregulatory responses to cognitive tasks regulated by DBA.展开更多
目的探讨间歇性充气加压(IPC)联合热疗对雄性家兔下肢血流动力学变化的影响。方法取健康清洁级雄性新西兰家兔30只,建立髋部术后血液高凝状态的雄性家兔模型。按照随机数字表法将30只雄性家兔模型分为IPC组(行IPC治疗)、热疗组(行40℃...目的探讨间歇性充气加压(IPC)联合热疗对雄性家兔下肢血流动力学变化的影响。方法取健康清洁级雄性新西兰家兔30只,建立髋部术后血液高凝状态的雄性家兔模型。按照随机数字表法将30只雄性家兔模型分为IPC组(行IPC治疗)、热疗组(行40℃热疗治疗)、IPC联合热疗组(行IPC联合40℃热疗治疗),每组10只。在造模前后及治疗后1、5、10 min时,通过彩色多普勒血流成像技术测定左下肢股静脉血流动力学参数。结果(1)血液平均流速、血液峰值流速以及每分钟血流量:3组治疗后1、5、10 min均明显高于治疗前(P<0.05),且随时间延长呈逐渐下降趋势(P<0.05);治疗后各时间段IPC联合热疗组均明显高于IPC组和热疗组(P<0.05)。(2)血管内径:3组治疗后各时间段比较差异均无统计学意义(P>0.05)。(3)心率:治疗后1 min IPC联合热疗组均明显高于IPC组和热疗组(P<0.05);治疗后5、10 min 3组比较差异均无统计学意义(P>0.05)。结论与IPC和热疗单独应用相比,IPC联合热疗可明显改变家兔下肢血流动力学,可产生更为强烈的扩张血管、改善下肢血液循环作用。展开更多
文摘Hyperthermia-induced decline in cognitive performance is a moderate complication that poses challenges to the maintenance of safety. Although the underlying mechanism can be attributed to the disruption of brain networks, the propensity remains unclear. This study aimed to test the hypothesis that the extent of the alterations in cognitive performance is governed by the activity of deep brain structures, including monoaminergic neural systems. A decline in cognitive performance during mild hyperthermia and the beneficial effects of neck cooling were demonstrated using the Continuous Performance Test as a battery of cognitive tasks. Aspects of cognitive performance were characterized using the deep-brain activity (DBA) index as a neural activity parameter and the State-Trait Anxiety Inventory to assess the extent of alterations in cognitive performance as an individual measure. It was found that a higher average DBA index during tasks is essential for high cognitive performance in the heat. This beneficial effect of DBA is governed by the upper brainstem. This DBA benefit is more significant for individuals with higher average DBA indices at rest in a normal environment. Individual differences in cognitive performance in the heat are governed by differences in DBA. In addition, the beneficial effect of DBA on cognitive performance in heat only applies under conditions including neck cooling. This limited neck-cooling effect is attributed to anti-homeostatic thermoregulatory responses to cognitive tasks regulated by DBA.
文摘目的探讨间歇性充气加压(IPC)联合热疗对雄性家兔下肢血流动力学变化的影响。方法取健康清洁级雄性新西兰家兔30只,建立髋部术后血液高凝状态的雄性家兔模型。按照随机数字表法将30只雄性家兔模型分为IPC组(行IPC治疗)、热疗组(行40℃热疗治疗)、IPC联合热疗组(行IPC联合40℃热疗治疗),每组10只。在造模前后及治疗后1、5、10 min时,通过彩色多普勒血流成像技术测定左下肢股静脉血流动力学参数。结果(1)血液平均流速、血液峰值流速以及每分钟血流量:3组治疗后1、5、10 min均明显高于治疗前(P<0.05),且随时间延长呈逐渐下降趋势(P<0.05);治疗后各时间段IPC联合热疗组均明显高于IPC组和热疗组(P<0.05)。(2)血管内径:3组治疗后各时间段比较差异均无统计学意义(P>0.05)。(3)心率:治疗后1 min IPC联合热疗组均明显高于IPC组和热疗组(P<0.05);治疗后5、10 min 3组比较差异均无统计学意义(P>0.05)。结论与IPC和热疗单独应用相比,IPC联合热疗可明显改变家兔下肢血流动力学,可产生更为强烈的扩张血管、改善下肢血液循环作用。