SIST EN ISO 8996:2022

Ergonomics of the thermal environment - Determination of metabolic rate (ISO 8996:2021)

This document specifies different methods for the determination of metabolic rate in the context of ergonomics of the thermal working environment. It can also be used for other applications, e.g. the assessment of working practices, the energetic cost of specific jobs or sport activities and the total energy cost of an activity. The methods are classified in four levels of increasing accuracy: level 1, Screening, with a table giving examples of activities with low, moderate and high metabolic rates; level 2, Observation, where the metabolic rate is estimated by a time and motion study; level 3, Analysis, where the metabolic rate is estimated from heart rate recordings or accelerometers measurements; and level 4, Expertise, where more sophisticated techniques are described. The procedure to put into practice these methods is presented and the uncertainties are discussed.

Ergonomie der thermischen Umgebung - Bestimmung des körpereigenen Energieumsatzes (ISO 8996:2021)

Dieses Dokument legt unterschiedliche Verfahren für die Bestimmung des Energieumsatzes im Bereich der Ergonomie der thermischen Arbeitsumgebung fest. Es kann auch für andere Anwendungsgebiete, zum Beispiel für die Bewertung von Arbeitsverfahren, des Energieaufwands für spezielle Aufgaben oder Sportaktivitäten sowie des Gesamtenergieaufwands einer Tätigkeit angewendet werden. Die Verfahren werden in vier Stufen mit zunehmender Genauigkeit eingeteilt: Stufe 1, Screening mit einer Tabelle, die Beispiele für Aktivitäten mit geringem, mittlerem und hohem Energieumsatz angibt; Stufe 2, Beobachtung, wo der Energieumsatz mit einer Zeit- und Bewegungsstudie geschätzt wird; Stufe 3, Analyse, wo der Energieumsatz aufgrund von Aufzeichnungen der Herzfrequenz oder der Messungen von Beschleunigungsaufnehmern geschätzt wird; und Stufe 4, Expertise, wo anspruchsvollere Techniken beschrieben werden. Das Verfahren, um diese Methoden durchzuführen, wird dargestellt und die Unsicherheiten werden diskutiert.

Ergonomie de l'environnement thermique - Détermination du métabolisme énergétique (ISO 8996:2021)

Le présent document spécifie différentes méthodes visant à déterminer le métabolisme énergétique dans le domaine de l’ergonomie de l’environnement de travail thermique. Il peut cependant être également utilisé en vue d’autres applications, par exemple l’évaluation des pratiques de travail, le coût énergétique de travaux ou d’activités sportives spécifiques et le coût énergétique global d’une activité. Les méthodes sont classées en quatre niveaux de précision croissante: niveau 1, Typologies, avec un tableau donnant des exemples d’activités avec métabolismes énergétiques faibles, modérés et élevés; niveau 2, Observation, où le métabolisme énergétique est estimé par une étude des temps et des mouvements; niveau 3, Analyse, où le métabolisme énergétique est estimé à partir d’enregistrements de la fréquence cardiaque ou de mesures d’accéléromètres; et niveau 4, Expertise, où des techniques plus sophistiquées sont décrites. Le mode opératoire pour mettre en pratique ces méthodes est indiqué et les incertitudes sont examinées.

Ergonomija toplotnega okolja - Ugotavljanje presnovne toplote (ISO 8996:2021)

Ta dokument določa različne metode za ugotavljanje presnovne toplote v kontekstu ergonomije toplotnega delovnega okolja. Primeren je tudi za druge vrste uporabe, npr. ocenjevanje delovnih praks, energetskih stroškov za posamezno delovno mesto ali športno dejavnost in skupnih energetskih stroškov posamezne dejavnosti. Metode so razvrščene v štiri stopnje povečanja natančnosti: stopnja 1 – presejanje, s preglednico primerov dejavnosti z nizko, zmerno in visoko prenosno toploto; stopnja 2 – opazovanje, pri čemer se presnovna toplota oceni na podlagi študije časa in gibanja; stopnja 3 – analiza, pri čemer se presnovna toplota oceni na podlagi zapisov srčnega utripa ali meritev merilnikov pospeška; ter stopnja 4 – strokovno znanje, pri čemer so opisane kompleksnejše tehnike. Predstavljen je postopek uporabe teh metod v praksi in obravnavane so negotovosti v zvezi s tem.

General Information

• Status: Published
• Public Enquiry End Date: 10-Jan-2021
• Publication Date: 28-Mar-2022
• ICS: 13.180 - Ergonomics
• Technical Committee: VSN - Safety of machinery
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 03-Jan-2022
• Due Date: 10-Mar-2022
• Completion Date: 29-Mar-2022
• Ref Project: EN ISO 8996:2021 - Ergonomics of the thermal environment - Determination of metabolic rate (ISO 8996:2021)

Relations

• Replaces: SIST EN ISO 8996:2005 - Ergonomics of the thermal environment - Determination of metabolic rate (ISO 8996:2004)
• Effective Date: 29-Dec-2021
• Revised: SIST EN ISO 8996:2005 - Ergonomics of the thermal environment - Determination of metabolic rate (ISO 8996:2004)
• Effective Date: 06-Sep-2017

Standards Content (Sample)

SLOVENSKI STANDARD
01-maj-2022
Nadomešča:
SIST EN ISO 8996:2005
Ergonomija toplotnega okolja - Ugotavljanje presnovne toplote (ISO 8996:2021)
Ergonomics of the thermal environment - Determination of metabolic rate (ISO
8996:2021)
Ergonomie der thermischen Umgebung - Bestimmung des körpereigenen
Energieumsatzes (ISO 8996:2021)
Ergonomie de l'environnement thermique - Détermination du métabolisme énergétique
(ISO 8996:2021)
Ta slovenski standard je istoveten z: EN ISO 8996:2021
ICS:
13.180 Ergonomija Ergonomics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 8996
EUROPEAN STANDARD
NORME EUROPÉENNE
December 2021
EUROPÄISCHE NORM
ICS 13.180 Supersedes EN ISO 8996:2004
English Version
Ergonomics of the thermal environment - Determination
of metabolic rate (ISO 8996:2021)
Ergonomie de l'environnement thermique - Ergonomie der thermischen Umgebung - Bestimmung
Détermination du métabolisme énergétique (ISO des körpereigenen Energieumsatzes (ISO 8996:2021)
8996:2021)
This European Standard was approved by CEN on 3 December 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 8996:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 8996:2021) has been prepared by Technical Committee ISO/TC 159
"Ergonomics" in collaboration with Technical Committee CEN/TC 122 “Ergonomics” the secretariat of
which is held by DIN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by June 2022, and conflicting national standards shall be
withdrawn at the latest by June 2022.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 8996:2004.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 8996:2021 has been approved by CEN as EN ISO 8996:2021 without any modification.

INTERNATIONAL ISO
STANDARD 8996
Third edition
2021-12
Ergonomics of the thermal
environment — Determination of
metabolic rate
Ergonomie de l'environnement thermique — Détermination du
métabolisme énergétique
Reference number
ISO 8996:2021(E)
ISO 8996:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii
ISO 8996:2021(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 The units . 1
5 The four levels of methods for estimating the metabolic rate . 1
6 Level 1, Screening: classification of metabolic rate by categories .3
7 Level 2, Observation .3
7.1 E valuation of metabolic rate for a given activity . 3
7.2 E valuation of the mean metabolic rate over a given period of time . 4
7.3 Accuracy . 4
8 Level 3, Analysis. 4
8.1 E valuation of metabolic rate using heart rate . 4
8.1.1 Principle of the method . 4
8.1.2 Determination of the (HR–M) relationship for purely dynamic muscular
work . 5
8.1.3 E valuation of the metabolic rate as a function of HR in real situations . 6
8.2 E valuation of metabolic rate by accelerometry. 7
9 Level 4, Expertise . 8
9.1 E valuation of metabolic rate by measurement of oxygen consumption rate . 8
9.1.1 Partial and integral method . 8
9.1.2 Evaluation of metabolic rate from oxygen consumption rate. 10
9.1.3 E valuation of oxygen uptake . 11
9.1.4 Calculation of metabolic rate . . 13
9.2 E valuation of metabolic rate by the doubly labelled water method for long term
measurements.13
9.3 E valuation of metabolic rate by direct calorimetry — Principle . 14
Annex A (informative) Evaluation of the metabolic rate at level 1, Screening .15
Annex B (informative) Evaluation of the metabolic rate at level 2, Observation .17
Annex C (informative) Evaluation of the metabolic rate at level 3, Analysis .21
Annex D (informative) Evaluation of the metabolic rate at level 4, Expertise .23
Annex E (normative) Correction of the heart rate measurements for thermal effects .25
Bibliography .27
iii
ISO 8996:2021(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 159, Ergonomics, Subcommittee
SC 5, Ergonomics of the physical environment, in collaboration with the European Committee for
Standardization (CEN) Technical Committee CEN/TC 122, Ergonomics, in accordance with the
Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 8996:2004), which has been technically
revised.
The main changes to the previous edition are as follows:
— The metabolic rate associated with a given task and estimated using the methods described in this
document is expressed in watts.
— At level 1, Screening, the method classifying metabolic rate according to occupation has been
removed, and revised procedures are provided for the evaluation of metabolic rate for given
activities (level 2, Observation) and when using heart rate (level 3, Analysis).
— The accuracy of the methods for estimating the metabolic rate has been reevaluated in light of
the recent literature and consequently the integral method is no longer recommended at level 4,
Expertise.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies c
...