Document Detail


Peak oxygen consumption and lactate threshold in full mask versus mouth mask conditions during incremental exercise.
MedLine Citation:
PMID:  8781862     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Respirator masks vary in inhalation and exhalation resistance, and in dead volume. It is believed that these factors may contribute significantly to an early anaerobic threshold in mask wearers during maximal exercise. Very little is known concerning the effect of respirator masks on maximal oxygen consumption (VO2max) and the lactate threshold (LT). The purpose of the present study was to assess peak VO2 (VO2peak), LT and the ventilatory threshold (VT) of 14 experienced cyclists performing two maximal cycle exercise protocols while wearing a full respirator mask (FM) (M17 type) and a mouth mask (MM). VO2peak was 10% lower under FM conditions. Peak values for ventilation (VEpeak), respiratory rate (fbpeak) and tidal volume (VTpeak) were all significantly lower under with FM versus MM conditions. Performance time and maximal heart rate (fcpeak) were not different between mask conditions. The LT and VT when expressed in %VO2peak, and the lactate concentration (mmol.l-1) at LT and VT were not significantly different across mask conditions. Bland-Altman plots demonstrated longer inhalation times, decreased Fr values and greater oxygen extraction under FM conditions. Thus, perhaps due to the increased inhalation resistance of the FM condition, subjects were unable to attain their "normal" VO2 despite similar performance times and maximal fc. Furthermore, despite a diminished VO2peak with FM, LT and VT appeared to be the same as with a MM.
Authors:
C R Dooly; A T Johnson; C O Dotson; P Vaccaro; P Soong
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  European journal of applied physiology and occupational physiology     Volume:  73     ISSN:  0301-5548     ISO Abbreviation:  Eur J Appl Physiol Occup Physiol     Publication Date:  1996  
Date Detail:
Created Date:  1996-11-01     Completed Date:  1996-11-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0410266     Medline TA:  Eur J Appl Physiol Occup Physiol     Country:  GERMANY    
Other Details:
Languages:  eng     Pagination:  311-6     Citation Subset:  IM    
Affiliation:
Department of Physical Education, Slippery Rock University, PA 16057, USA.
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MeSH Terms
Descriptor/Qualifier:
Adolescent
Adult
Exercise / physiology*
Female
Heart Rate
Humans
Lactic Acid / blood*
Male
Oxygen Consumption*
Respiratory Protective Devices* / adverse effects
Chemical
Reg. No./Substance:
50-21-5/Lactic Acid

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


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