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Changes in transdiaphragmatic twitch pressure (Pdi,tw ) during cervical magnetic stimulation immediately after and 30 min after the 15-min hyperpnoea test in normoxia (diamond), hypoxia (triangle) and hyperoxia (square). Values are mean ± SD. All values were significantly reduced immediately after and 30 min after hyperpnoea compared to before hyperpnoea. ** significantly different from normoxia and hyperoxia (P < 0.01).
