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Maximum % change for HR and MAP responses during the initial, middle and late phases of the HUT during QS and AS in the supine and prone sleeping positions at 2–4 wks (a), 2–3 mo (b), and 5–6 mo (c) PNA. *P < 0.05 **P < 0.01 prone versus supine; †P < 0.05 QS versus AS.
