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Interaction between position and homeostatic sleep pressure. The orthostatic response of systolic pressure was significant in the sleep condition but not in the sleep deprivation condition. Data of the two age groups were pooled because the position and sleep deprivation bear no interaction with the age factor. SBP, systolic blood pressure; DBP, diastolic blood pressure; HR, heart rate; SR, semi-recumbent; UR, upright.
