External inspiratory resistance of protective respiratory devices: Effects on physical performance and respiratory function

Research output: Contribution to journalArticlepeer-review

Abstract

Twenty subjects wearing protective respirators were studied during submaximal exercise (80% of Vo2max) on a treadmill. The protective devices were fitted with canister filters of low expiratory resistance and different inspiratory resistances: (0.3, 1.8, 2.8, 3.4, 3.9, and 4.6 cm H2O x sec/liter). The effect of inspiratory resistance on physical endurance, various physiological parameters, and subjective sensations was examined. With the increase in inspiratory resistance, a significant decrease in physical performance, decrease in tidal volume, increased ratio of inspiratory to expiratory time, increased peak inspiratory pressure, and increased CO2 retention were observed. The difficulty in inspiration correlated significantly to inspiratory resistance and seems to be the main reason for cessation of the effort. No acceptable upper limit for the inspiratory resistance of the canister filters was found. Any decrease in the inspiratory resistance of the mask's filter enhanced endurance and performance.

Original languageEnglish
Pages (from-to)733-740
Number of pages8
JournalAmerican Journal of Industrial Medicine
Volume4
Issue number6
DOIs
StatePublished - 1983

Keywords

  • inspiratory difficulty
  • inspiratory resistance endurance
  • respirators
  • respiratory physiology

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