Document Detail

Influence of inspiratory resistance on performance during graded exercise tests on a cycle ergometer.
MedLine Citation:
PMID:  15374766     Owner:  NLM     Status:  MEDLINE    
Due to more stringent requirements to protect personnel against hazardous gasses, the inspiratory resistance of the present generation of respiratory protective devices tends to increase. Therefore an important question is to what extent inspiratory resistance may increase without giving problems during physical work. In this study the effects of three levels (0.24; 1.4 and 8.3 kPa s l(-1)) of inspiratory resistance were tested on maximal voluntary performance. Nine male subjects performed a graded exercise test on a cycle ergometer with and without these three levels of inspiratory resistance. Oxygen consumption, heart rate, time to exhaustion and external work were measured. The results of these experiments showed that increasing inspiratory resistance led to a reduction of time to exhaustion (TTE) on a graded exercise test(GXT). Without inspiratory resistance the mean TTE was 11.9 min, the three levels of resistance gave the following mean TTE's: 10.7, 7.8 and 2.7 min. This study showed that TTE on a GXT can be predicted when physical fitness (VO2-max) of the subject and inspiratory resistance are known. The metabolic rate of the subjects was higher with inspiratory resistance, but no differences were found between the three selected inspiratory loads. Other breathing parameters as minute ventilation, tidal volume, expiration time and breathing frequency showed no or minor differences between the inspiratory resistances. The most important conclusion of these experiments is that the overall workload increases due to an increase in inspiratory resistance by wearing respiratory protective devices.
Ronald Heus; Emiel A den Hartog; Lyda J A Kistemaker; Walter J van Dijk; Gerard Swenker
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Applied ergonomics     Volume:  35     ISSN:  0003-6870     ISO Abbreviation:  Appl Ergon     Publication Date:  2004 Nov 
Date Detail:
Created Date:  2004-09-17     Completed Date:  2005-02-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0261412     Medline TA:  Appl Ergon     Country:  England    
Other Details:
Languages:  eng     Pagination:  583-90     Citation Subset:  IM    
TNO Industrial Technology, Department of Product Development, PO Box 6235, NL5600HE Eindhoven, The Netherlands.
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MeSH Terms
Carbon Dioxide / metabolism
Exercise Test
Middle Aged
Oxygen Consumption
Respiratory Mechanics*
Respiratory Muscles / physiology
Respiratory Protective Devices
Reg. No./Substance:
124-38-9/Carbon Dioxide

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