Can the Ejection Fraction fluctuate during the day?

[Felipe10]

In  an effort to clarify this matter for myself and the benefit of others interested on the matter, I would like to ask this question:

Can the Ejection Fraction percentile fluctuate during the day just like blood pressure and heart rate can change throughout the day on a normal individual?    

Please assume that the same facility, test equipment, medical technician, and the individual's condition remain constant in this exercise.

Thanks in advance for an objective response.
Thank you.

[Ger57]

I think small variations on EF are normal.
Just as your blood pressure varies, there will be small variations in EF as well. Your body position will influence it as well.
But as EF is measured in rest and in a consistent position, the variations are not significant.  An EF will not be 40% in the morning and 55% later that same day.