Heat-exchanger breathing masks during heavy exertion in cold conditions; protection or a hindrance?

Not Applicable

Completed

• Conditions: Airway injury; Respiratory

• Registration Number: ISRCTN10018222
• Lead Sponsor: Mid Sweden University

Brief Summary

2021 Results article in https://pubmed.ncbi.nlm.nih.gov/33782715/ (added 17/08/2022) 2022 Results article in https://pubmed.ncbi.nlm.nih.gov/35391634/ (added 17/08/2022)

Detailed Description

Not available

Study Timeline

• Results First Posted: 1900-01-01
• Study Start: 2019-04-01
• Study Completion: 2019-06-30
• Last Update Posted: 29 August 2022

Recruitment & Eligibility

• Status: Completed
• Sex: All
• Target Recruitment: 23

Inclusion Criteria

Current inclusion criteria as of 20/06/2019:
1. Healthy, well-trained adults
2. Experience of treadmill running

Previous inclusion criteria:
1. Healthy, competitive cross-country skier
2. > 3 years training experience and should be experienced in treadmill roller-skiing using the classical diagonal stride technique

Exclusion Criteria

1. No reported airway infection within 4 weeks prior to each visit
2. Asthma, lung diseases and other diseases that may significantly affect their physical performance status

Study & Design

• Study Type: Interventional
• Study Design: Not specified

Primary Outcome Measures

Name	Time	Method
Delta-FEV1 (forced expiratory volume first second), measured by dynamic spirometry. Delta-FEV1 is FEV1 immediately post exposure minus FEV1 pre exposure. Delta-FEV1 with HME compared to delta-FEV1 without HME.