Screening of exercise-induced asthma using exercise in subzero temperature air

Screening of exercise-induced bronchoconstriction using exercise challenge in subzero temperature air

Status

Active, not recruiting

Phases

Unknown

Study type

Observational

Source

ISRCTN

Registry ID

ISRCTN12919627

Enrollment

100

Registered

2022-09-29

Start date

2022-09-01

Completion date

Unknown

Last updated

2025-10-20

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Exercise-induced bronchoconstriction Respiratory

Interventions

Current interventions as of 16/09/2024: Study participants were invited by randomization from a list of study subjects participating in a web survey on airway symptoms and asthma among cross-country s

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: Current or former students at Swedish National Elite Sports Schools in cross-country skiing and biathlon participating in a survey on heat- and moisture-exchanging breathing masks, airway symptoms, and asthma. Added 16/09/2024: From 2024 and onwards, eligible subjects are restricted to students at Swedish National sport schools in biathlon and cross-country skiing.

Exclusion criteria

Exclusion criteria: Airway infection within 4 weeks prior to exercise challenge

Design outcomes

Primary

Measure	Time frame
Prevalence of exercise-induced bronchoconstriction, defined as the maximal reduction in FEV1 of >= 10%, measured using dynamic spirometry 5, 10, 15, 20, and 30 minutes post challenge	—

Secondary

Measure	Time frame
Prevalence of exercise-induced bronchoconstriction, defined as the maximal increase in airway resistance (R5) of >= 40%, measured using impulsoscillometry at 3,8,13,18, and 28 minutes post challenge	—

Countries

Sweden

Outcome results

None listed

Source: ISRCTN (via WHO ICTRP) · Data processed: Feb 4, 2026