Fig 1. Delta of haemoglobin O2 saturation (ΔSpO2, difference between rest and maximal exercise values) at sea level and at 2150 meters for EIH, non-EIH and untrained participants.
§ Significantly different from sea level (p < 0.01); * Significantly different from untrained participants (p < 0.01); # Significantly different from non-EIH (p < 0.01).