Changes in cardiac output is minimal during:

Ref: Pal GK. Cardiac output. In: Textbook of Medical Physiology. Ahuja Publishing House. 2007; 74: 607.Explanation:Increased cardiac outputExerciseAnxietyEmotion and excitementT environmental temperatureEatingPregnancyDecrease in cardiac outputStanding from supineSweatingNo change in cardiac outputSleepMild to moderate change in environmental temperature