To establish whether the decrease in pulmonary function as a result of wearing a neoprene suit is caused by restriction or obstruction, and which effect is has on pulmonary volumes.
ID
Source
Brief title
Condition
- Other condition
Synonym
Health condition
ademhalingsstelsel, niet zijnde een aandoening
Research involving
Sponsors and support
Intervention
Outcome measures
Primary outcome
This study aims to establish whether the expected decrease in vital capacity
when wearing a neoprene diving suit is the result from a decrease in
inspiratory capacity (VC) or an increase in residual volume (RV).
Secondary outcome
Airway resistance with or without a neoprene diving suit.
Background summary
Divers wear protective suits to enable working under water: ether a neoprene
'wetsuit' or a 'drysuit'. A wetsuit provides more comfort than a drysuit,
therefore, divers often prefer this over wearing a drysuit.
Recent studies (1, 2) have shown that a neoprene suit can reduce the vital
capacity of the lung up to 7%. Aside from a few methodological shortcomings of
these studies, both have not investigated the cause of this reduction. This can
either be restrictive - the suit making it difficult to perform full breath
excursions or increasing residual volume - or obstructive - increased airway
resistance.
This is relevant, because it affects the physiological adaptations the lung has
to make to function under water. With this knowledge, we can better advise
divers which protective suits to wear under which circumstances.
References:
1. Schellart NAM, Sterk W. Influence of the diving wetsuit on standard
spirometry. Diving Hyperb Med. 2016 Sep;46(3):138-141.
2. Stevens GC, Smart D. The influence of wet suit thickness (7 mm and over) on
pulmonary function in scuba divers. Diving Hyperb Med. In review.
Study objective
To establish whether the decrease in pulmonary function as a result of wearing
a neoprene suit is caused by restriction or obstruction, and which effect is
has on pulmonary volumes.
Study design
A randomised cross-over trial, in which subjects twice perform pulmonary
function tests and bodyplethysmography (i.e., bodybox) and forced oscillation
technique. Once under regular conditions and once wearing a neoprene diving
suit (thickness: 7 mm). The order in which these are performed is determined
randomly.
Study burden and risks
Participation in this study will approximately take 30 minutes (twice 10
minutes of testing, with overhead associated with getting into the neoprene
diving suit). Measurements shall be performed according to international
standards. (3, 4) Risks of these procedures are negligible.
The subject will wear his or her 'own' diving suit.
Referenties:
3. Graham BL, Steenbruggen I, et al. Standardization of Spirometry 2019 Update.
An Official American Thoracic Society and European Respiratory Society
Technical Statement. Am J Respir Crit Care Med. 2019; 200(8):e70-e88.
4. King GG, Bates KI, et al. Technical Standards for Respiratory Oscillometry.
Eur Resp J. 2020; 55: 1900753.
Rijkszee en Marinehaven 1
Den Helder 1780CA
NL
Rijkszee en Marinehaven 1
Den Helder 1780CA
NL
Listed location countries
Age
Inclusion criteria
Divemedically fit personnel of the Royal Netherlands Navy
Exclusion criteria
Recent (<6 weeks) upper or lower respiratory tract infection
Design
Recruitment
Followed up by the following (possibly more current) registration
No registrations found.
Other (possibly less up-to-date) registrations in this register
No registrations found.
In other registers
| Register | ID |
|---|---|
| CCMO | NL87993.041.24 |