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Minute Volumes and Inspiratory Flow Rates During Exhaustive Treadmill Walking Using Respirators.

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Title: Minute Volumes and Inspiratory Flow Rates During Exhaustive Treadmill Walking Using Respirators.
Authors: INGVAR HOLMéR, KALEV KUKLANE, CHUANSI GAO
Source: Annals of Occupational Hygiene. May2007, Vol. 51 Issue 3, p327-327. 1p.
Subjects: Treadmill exercise, Breathing apparatus, Mechanical ventilators, Protective coverings
Abstract: Air flow rate through filters and face masks is one important determinant of the final protection factor of a respiratory protective device in use. Respiratory minute volumes and instantaneous breath flow rates were measured in eight subjects during treadmill work using three types of filtering respirators and one control breathing mask. Work comprised five consecutive bouts of walking at 5 km/h with an increase in elevation of the treadmill by 5% every 5 min and a final walk at 6 km/h and 22.5%. Three subjects managed to complete 5 min at the final work rate. Minute ventilation increased in a curvilinear manner with oxygen uptake and reached 88 ± 20 and 93 ± 20 l/min at 5 km/h (20%) with the control mask and a half mask with filter (SP), respectively. Mean peak inspiratory flow rate (PIFR) was 273 ± 39 for Control and 300 ± 36 for SP at the same work rate. Two power assisted, positive pressure filter respirators (SA and SE) produced higher mask minute volumes at any given work rate compared to respiratory minute volumes in control and SP. PIFR in SA and SE were equal to or lesser than SP. During standardized speech communication, minute volumes decreased. In contrast, PIFR increased by about 100% at low work rates and about 30% at 5 km/h (20%) compared to no speech condition, reaching a highest value of 414 ± 46 l/min for SE. Filter testing is made at a constant flow rate of 95 l/min, a condition that eventually needs to be reconsidered in order to ensure a relevant and valid function test. [ABSTRACT FROM AUTHOR]
Copyright of Annals of Occupational Hygiene is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: Minute Volumes and Inspiratory Flow Rates During Exhaustive Treadmill Walking Using Respirators.
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  Data: <searchLink fieldCode="AR" term="%22INGVAR+HOLMéR%22">INGVAR HOLMéR</searchLink><br /><searchLink fieldCode="AR" term="%22KALEV+KUKLANE%22">KALEV KUKLANE</searchLink><br /><searchLink fieldCode="AR" term="%22CHUANSI+GAO%22">CHUANSI GAO</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22Treadmill+exercise%22">Treadmill exercise</searchLink><br /><searchLink fieldCode="DE" term="%22Breathing+apparatus%22">Breathing apparatus</searchLink><br /><searchLink fieldCode="DE" term="%22Mechanical+ventilators%22">Mechanical ventilators</searchLink><br /><searchLink fieldCode="DE" term="%22Protective+coverings%22">Protective coverings</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Air flow rate through filters and face masks is one important determinant of the final protection factor of a respiratory protective device in use. Respiratory minute volumes and instantaneous breath flow rates were measured in eight subjects during treadmill work using three types of filtering respirators and one control breathing mask. Work comprised five consecutive bouts of walking at 5 km/h with an increase in elevation of the treadmill by 5% every 5 min and a final walk at 6 km/h and 22.5%. Three subjects managed to complete 5 min at the final work rate. Minute ventilation increased in a curvilinear manner with oxygen uptake and reached 88 ± 20 and 93 ± 20 l/min at 5 km/h (20%) with the control mask and a half mask with filter (SP), respectively. Mean peak inspiratory flow rate (PIFR) was 273 ± 39 for Control and 300 ± 36 for SP at the same work rate. Two power assisted, positive pressure filter respirators (SA and SE) produced higher mask minute volumes at any given work rate compared to respiratory minute volumes in control and SP. PIFR in SA and SE were equal to or lesser than SP. During standardized speech communication, minute volumes decreased. In contrast, PIFR increased by about 100% at low work rates and about 30% at 5 km/h (20%) compared to no speech condition, reaching a highest value of 414 ± 46 l/min for SE. Filter testing is made at a constant flow rate of 95 l/min, a condition that eventually needs to be reconsidered in order to ensure a relevant and valid function test. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Annals of Occupational Hygiene is the property of Oxford University Press / USA and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Text: English
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      – SubjectFull: Treadmill exercise
        Type: general
      – SubjectFull: Breathing apparatus
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      – SubjectFull: Mechanical ventilators
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      – SubjectFull: Protective coverings
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              Text: May2007
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