TABLE 3.

CHANGES IN FORCED EXPIRATORY VOLUMES CAUSED BY HYPERVENTILATION OF HUMIDIFIED AIR AT HIGH TEMPERATURE AND AT ROOM TEMPERATURE

	FEV1* (L)	FVC (L)	FEV1/FVC
Patient Type, Treatment	Before	During	Before	During	Before	During
Asthma
RA	3.52 ± 0.29	3.44 ± 0.30	4.35 ± 0.46	4.43 ± 0.46	82.33 ± 3.24	78.67 ± 3.42*
HA	3.45 ± 0.32	3.04 ± 0.21*	4.30 ± 0.46	4.29 ± 0.41	81.17 ± 2.94	71.67 ± 2.36*
Healthy
RA	4.27 ± 0.32	4.44 ± 0.49	5.39 ± 0.65	5.31 ± 0.65	81.20 ± 4.41	81.60 ± 4.72
HA	4.43 ± 0.48	4.48 ± 0.55	5.43 ± 0.72	5.43 ± 0.71	83.40 ± 4.37	83.40 ± 3.83

Definition of abbreviations: HA = humidified air at high temperature; RA = humidified air at room temperature.

^*Forced expiratory tests were performed before and at ∼8 min after the hyperventilation challenge in patients with asthma (n = 6) and healthy subjects (n = 5; the test was not done after HA in one subject).

^†Significant difference (P < 0.05; paired t test) between before and after the hyperventilation challenge.