Cold air and exercise challenge -- influence of minute ventilation.

Exercises testing and cold air challenges are frequently used to assess airway hyperresponsiveness (AHR), but different goals are set for the two tests. We, therefore, wished to determine whether cold air and exercise challenge testing yielded similar responses and if any differences were due to differences in the maximum minute ventilation achieved. Twenty asthmatic subjects each performed a cold air (CACh) and an exercise (EXCh) challenge.