The rate at which energy is used by an organism at complete rest, measured in human beings by the heat given off per unit time, and expressed as the calories released per kilogram of body weight or per square meter of body surface per hour.基础代谢速度：有机体在完全松弛的状态下消耗能量的速度，对人来说，用每单位时间释放的热量来测量，表示为身体每千克重量或身体表面每平方米皮肤在每小时内释放的卡路里