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Protocol for the study. Twenty-two participants were recruited. Participants were block randomized 1:1 to iron or saline. Participants were exposed to sustained isocapnic hypoxia for 6 h on days 0, 1, 8, and 43. Day 0 was a baseline measurement day that was undertaken at least 3 days before day 1. An infusion of iron or saline was given on day 1.
