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MAP responses to HUT in the supine (black boxes) and prone (open boxes) position during QS and AS at 2–4 wks, 2–3 mo, and 5–6 mo PNA. Shaded areas represent the initial, middle and late phases of the HUT where the MAP was significantly lower in the prone versus supine sleeping position. The tilt is indicated by the dotted line. #P < 0.05 MAP prone versus supine.
