Weiss B A, Powers M E
Culver-Stockton College, Canton, MO, USA.
J Sports Med Phys Fitness. 2006 Dec;46(4):555-63.
The aim of this work was to examine the effects of creatine (Cr) supplementation on resting body water volumes and on core temperature and sweat loss during a bout of exercise in a warm environment.
Twenty-four aerobically trained male subjects (age 22.93+/-3.01 years, height 179.52+/-7.28 cm, mass 82.06+/-14.32 kg) volunteered to participate in this study. Each subject was assessed for resting body water volumes and for body mass (BM), heart rate (HR), blood pressure (BP), and core temperature immediately before and following a 60-min bout of exercise in a warm environment. Core temperature, HR, and BP were also recorded at 10-min intervals during exercise. Subjects were then randomly assigned to either a Cr or placebo (P) group. Each subject returned following a 5-day supplementation period and was reassessed using identical testing procedures. BM was measured using a standard electronic scale. Body water volumes were assessed using a multi-frequency BIS (Xitron Technologies, San Diego, CA, USA). Core body temperature was measured using a CorTemp Disposable Temperature Sensor and a CT2000 Miniaturized Ambulatory Recorder (HTI Technologies, Inc., Palmetto, FL, USA).
The Cr group experienced a significant increase in all body water volumes. No changes were observed in the P group. No changes in core temperature or sweat loss were observed in either group following supplementation.
Cr loading did not impair the thermoregulatory response during a bout of exercise in the heat.
本研究旨在探讨补充肌酸（Cr）对静息时身体水容量以及在温暖环境中进行一轮运动期间核心体温和汗液流失的影响。
24名经过有氧训练的男性受试者（年龄22.93±3.01岁，身高179.52±7.28厘米，体重82.06±14.32千克）自愿参与本研究。在温暖环境中进行60分钟运动前后，立即对每位受试者的静息身体水容量、体重（BM）、心率（HR）、血压（BP）和核心体温进行评估。运动期间还每隔10分钟记录一次核心体温、HR和BP。然后将受试者随机分为Cr组或安慰剂（P）组。每位受试者在为期5天的补充期后返回，并使用相同的测试程序重新评估。使用标准电子秤测量BM。使用多频生物电阻抗分析仪（美国加利福尼亚州圣地亚哥市Xitron Technologies公司）评估身体水容量。使用CorTemp一次性温度传感器和CT2000小型动态记录仪（美国佛罗里达州棕榈市HTI Technologies公司）测量核心体温。
Cr组所有身体水容量均显著增加。P组未观察到变化。补充后两组的核心体温或汗液流失均未观察到变化。
在热环境中进行一轮运动期间，补充Cr不会损害体温调节反应。
