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Mean ± SD thirst rating for Controls (mean ± SD sweat [Na+] = 43.7 ± 9.9 mmol/l), non-CF SS ([Na+] = 91.0 ± 17.3 mmol/l), and CF subjects (sweat [Na+] = 132.6 ± 6.4 mmol/l) increased as expected over progressive dehydration (%body wt loss) (P < 0.001) via exercise in the heat, but this was not affected by group (P = 0.310).
