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A, individual slopes; B, group data (mean ± SD). Filled circles, sea level control; open circles, sea level ACZ; filled squares, 5050 m control; open squares, 5050 m ACZ. Ascent to 5050 m enhanced the cardiovascular response to CO2, while no changes were observed following ACZ at either sea level or 5050 m. *Different from sea level (P < 0.05).
