Acute taurine supplementation enhances thermoregulation and endurance cycling performance in the heat

Abstract

This study investigated the effects of oral taurine supplementation on cycling time to exhaustion at a fixed-intensity and thermoregulation in the heat. In a double-blind, randomised crossover design, 11 healthy males participated in a time to exhaustion test in the heat (35°C, 40% RH), cycling at the power output associated with ventilatory threshold, 2?h after ingesting: Taurine (50?mg?kg^?1) or placebo (3?mg?kg^?1?maltodextrin). Core and mean skin temperature, mean sweat rate, heart rate, rating of perceived exertion (RPE), thermal comfort and thermal sensation were measured during exercise and blood lactate concentration (B[La]) was measured after exercise. Taurine supplementation increased time to exhaustion by 10% (25.16 min vs. 22.43 min, p?=?0.040), end sweat rate by 12.7% (687?nL?min^?1 vs. 600?nL?min^?1, p?=?0.034) and decreased B[La] by 16.5% (5.75?mmol?L^?1 vs. 6.85?mmol?L^?1, p?=?0.033). Core temperature was lower in the final 10% of the time to exhaustion (38.5°C vs. 38.1°C, p?=?0.049). Taurine supplementation increased time to exhaustion and local sweating, while decreasing RPE and core temperature in the later stages of exercise, as well as reducing post-exercise B[La]. This study provides the evidence of taurine's role in thermoregulatory processes. These findings have implications for the short-term preparation strategies of individuals exercising in the heat. Based on these findings, a single dose of taurine 2?h prior to training or competition would provide an ergogenic and thermoregulatory effect.     

基于ANSYS的分级机主轴冷却系统的设计与分析

针对过热蒸汽气流磨在进行粉体加工时,高温的过热蒸汽会导致分级机主轴轴承温度高于额定工作温度,设计了一种能使分级机主轴有效降温的水冷却系统.以某型号的过热蒸汽分级机为原型建模,利用ANSYS软件,对其在自然冷却与所设计的水冷却系统下主轴系统的温度进行数值模拟分析,表明所设计的水冷却系统对分级机主轴系统具有良好的冷却效果.     

高炉冷却水温差高精度检测系统的研究与应用

针对国内高炉冷却水温差检测系统测温精度不高的弊端,设计并开发了高炉冷却水温差高精度检测系统。检测系统由测温节点、温度采集终端与上位机构成,之间通讯采用RS-485,基于三线制Pt1000设计了比率电桥温度补偿电路,并结合A/D转换器AD7799,构成信号处理电路,提高了水温采集精度。     

LNG船舶预冷过程中冷却液的CFD模拟

为提高液化天然气（Liquefied Natural Gas, LNG）船舶的管理水平和营运效率,对预冷过程中的冷却液用计算流体力学（Computational Fluid Dynamics, CFD）软件进行模拟.该方法首先对LNG船舶液货舱的构造和换热环境进行假设,然后用GAMBIT对液货舱进行网格划分,模拟出温度图、冷却液质点迹线图和速度矢量图.对某LNG船舶液货舱预冷过程的调研表明,该方法所做的CFD模拟与实船的预冷过程和操作规章相符,预冷速度和预冷时间相差很小,能够真实反映实船预冷过程的实际情况.     

Real-time temperature control for high arch dam based on decision support system

It is important and difficult to control the temperature of mass concrete structure during high arch dam construction.A new method with decision support system is presented for temperature control and crack prevention.It is a database system with functions of data storage,information inquiry,data analysis,early warning and resource sharing.Monitoring information during construction can be digitized via this system,and the intelligent analysis and dynamic control of concrete temperature can be conducted.This method has been applied in the construction of the Dagangshan Arch Dam in China and has proven to be very convenient.Based on the decision support of this system and the dynamic adjustment of construction measures,the concrete temperature of this project is well-controlled.     

Energy Performance and Condensation Risk of DCDV System in Subtropical Hong Kong简

The combined use of dry cooling （DC） system and dedicated ventilation （DV） system to decouple cool-ing and dehumidification process for energy efficiency was proposed for subtropical climates like Hong Kong. In this study, the energy performance and condensation risk of the use of DCDV system were examined by analyzing its ap-plication in a typical office building in Hong Kong. Through hour-by-hour simulation using actual equipment per-formance data and realistic building and system characteristics, it was found that with the use of DCDV system, the annual energy consumption could be reduced by 54%in comparison with the conventional system （constant air vol-ume with reheat system）. In respect of condensation risk, it was found that the annual frequency of occurrence of con-densation on DC coil was 35 h. Additional simulations were conducted to examine the influence of different parame-ters on the condensation risk of DCDV system. Measures to ensure condensate-free on DC coil were also discussed.     

中枢性高热患者冰毯机降温与冰毯机加药物降温效果观察

目的：中枢性高热病人应用冰毯机加药物吲哚美辛栓肛门内给药降温的效果观察。方法：对中枢性高热病人在常规治疗基础上,分别采用冰毯机加药物吲哚美辛栓肛门内给药降温和冰毯机降温,比较两组病人降温效果。结果：两组病人降温效果差异有统计学意义（P〈0.05）。结论：冰毯机加药物吲哚美辛栓肛门内给药降温效果明显优于冰毯机降温。     

汽化冷却烟道爆管的分析与研究

通过对汽化冷却烟道使用过程出现爆管时的追踪和分析,得出爆管主要有材质使用不当,水质不达标,设计不合理等原因     

基于间接蒸发冷却技术新风换气机的实验

针对室内排风的热回收效率不高的问题,设计了一种基于间接蒸发冷却技术的新回风换气机,采取微雾喷淋方式的水蒸发冷却技术和亲水高分子纤维的芯体,可实现高效热回收。通过建立实验平台,对该新换热气机的换热过程进行了测试分析,结果表明热回收效率高达141%,节能效果显著。     

空压机冷却系统的改造与应用

潘-矿空压机原冷却系统采用水冷方式，由于冷却水流量不足，空压机只能单机运行，有必要对冷却系统进行改造，以满足生产需要；对空压机冷却系统的组成、工作原理进行了系统论述，在原冷却管路上进行改造，减小管道阻力，增大水泵流量，增强空压机的冷却效果，提高设备的利用率；采用这种方法改造投入的费用较少，改造部分可自行完成，达到良好的效果。