1. Efficacy of a Heat Exchanger Mask in Cold Exercise-Induced Asthma
Beuther David A. , MD, Martin Richard J. , MD, FCCP 
CHEST 
Volume 129, Issue 5, Pages (May 2006)
DOI: /chest
Copyright © 2006 The American College of Chest Physicians Terms and Conditions

2. Figure 1
Cold air testing apparatus. Cold air is produced by an expansion valve and delivered to the front of the mask through an overlying continuous positive airway pressure (CPAP) mask. Inhaled air temperature is measured at the front of the heat exchanger mask.
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Copyright © 2006 The American College of Chest Physicians Terms and Conditions

3. Figure 2
Individual changes in FEV1 with cold air exercise in study 1. Solid bars represent the placebo exercise; striped bars represent the active device exercise. The active heat exchanger mask is highly effective, particularly in subjects demonstrating a > 10% decline in FEV1 with placebo exercise.
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Copyright © 2006 The American College of Chest Physicians Terms and Conditions

4. Figure 3
Mean percentage change in FEV1 and FEF25–75 after cold air exercise in study 2. Solid bars represent placebo exercise, striped bars represent the active device exercise, and shaded bars represent the albuterol pretreatment exercise.
CHEST  , DOI: ( /chest )
Copyright © 2006 The American College of Chest Physicians Terms and Conditions