AS/NZS ISO 16976.4:2024
Respiratory protective devices - Human factors, Part 4: Work of breathing and breathing resistance: physiologically based limits
The objective of this document is to describe how to calculate the work performed by a person’s respiratory muscles with and without the external respiratory impediments that are imposed by RPD of all kinds, except diving equipment. This document describes how much additional impediment people can tolerate and contains values that can be used to judge the acceptability of an RPD. This document is identical with, and has been reproduced from ISO 16976‑4:2023, Respiratory protective devices – Human factors – Part 4: Work of breathing and breathing resistance: physiologically based limits. The secretariat of this committee is managed by Standards Australia. Please see the attached document on how to access public comment drafts and submitting comments via the Standards Australia Public Commenting Portal, Connect.
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AS/NZS ISO 16976.4:2024 Respiratory protective devices - Human factors Work of breathing and breathing resistance: physiologically based limits
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Pressure and volume changes during breathing
5.1 Pressure and volume changes in the absence of an RPD
5.2 The effect of RPD flow resistance on pressure and volume changes while using an RPD
5.3 The effect of RPD with static pressure on pressure and volume changes while using an RPD
5.4 The effect of RPD flow resistance and static pressure on pressure and volume changes while using an RPD
5.5 Effects of high static pressure
6 Work of breathing (WoB)
6.1 Physiological work versus physical work
6.1.1 General
6.1.2 Static work
6.1.3 Elastic work
6.1.4 Positive and negative physical work
6.2 Calculations of inspiratory WoB
6.3 Calculations of expiratory WoB
6.4 Calculations of total WoB
6.4.1 Calculations of the wearer’s WoB while using an RPD
6.4.2 Calculations of WoB for an RPD only
6.5 Breathing resistance
6.6 Physiologically acceptable WoB
7 Other respiratory loads
7.1 Static load
7.2 Elastic loads
7.3 Other loads
7.4 How respiratory loads add up
8 Summary
Bibliography
Previous versions
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AS/NZS ISO 16976.4:2024 Respiratory protective devices - Human factors Work of breathing and breathing resistance: physiologically based limits
Preface
Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
5 Pressure and volume changes during breathing
5.1 Pressure and volume changes in the absence of an RPD
5.2 The effect of RPD flow resistance on pressure and volume changes while using an RPD
5.3 The effect of RPD with static pressure on pressure and volume changes while using an RPD
5.4 The effect of RPD flow resistance and static pressure on pressure and volume changes while using an RPD
5.5 Effects of high static pressure
6 Work of breathing (WoB)
6.1 Physiological work versus physical work
6.1.1 General
6.1.2 Static work
6.1.3 Elastic work
6.1.4 Positive and negative physical work
6.2 Calculations of inspiratory WoB
6.3 Calculations of expiratory WoB
6.4 Calculations of total WoB
6.4.1 Calculations of the wearer’s WoB while using an RPD
6.4.2 Calculations of WoB for an RPD only
6.5 Breathing resistance
6.6 Physiologically acceptable WoB
7 Other respiratory loads
7.1 Static load
7.2 Elastic loads
7.3 Other loads
7.4 How respiratory loads add up
8 Summary
Bibliography
Previous versions
AS/NZS ISO 16976.4:2024
Online Library subscription information
Online library subscriptions provide a cost-effective solution for organisations of any size to access the latest standards, offering 24/7 access to a personalised catalogue. The service ensures subscribers have have the most up-to-date version of selected standards, incluing automatic updates for any amendments or versions. Pricing is dependent on the chosen standards and the number of concurrent users, with discounts applied from the standards PDF price. For customised subscriptions or further inquiries, contact the Online Library team.