NF EN ISO 8996

NF EN ISO 8996

February 2005
Standard Cancelled

Ergonomics of the thermal environment - Determination of metabolic rate

The metabolic rate, as a conversion of chemical into mechanical and thermal energy, measures the energetic cost of muscular load and gives a numerical index of activity. Metabolic rate is an important determinant of the comfort or the strain resulting from exposure to a thermal environment. In particular, in hot climates, the high levels of metabolic heat production associated with muscular work aggravate heat stress, as large amounts of heat need to be dissipated, mostly by sweat evaporation.ISO 8996:2004 specifies different methods for the determination of metabolic rate in the context of ergonomics of the climatic working environment. It can also be used for other applications -- for example, the assessment of working practices, the energetic cost of specific jobs or sport activities, the total cost of an activity, etc.

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Main informations

Collections

National standards and national normative documents

Thematics

Sécurité, Silver économie, Gestion des risques et SST, Accessibilité, QSE

Publication date

February 2005

Number of pages

31 p.

Reference

NF EN ISO 8996

ICS Codes

13.180   Ergonomics

Classification index

X35-205

Print number

1 - 04/02/2005

International kinship

ISO 8996:2004

European kinship

EN ISO 8996:2004
Sumary
Ergonomics of the thermal environment - Determination of metabolic rate

The metabolic rate, as a conversion of chemical into mechanical and thermal energy, measures the energetic cost of muscular load and gives a numerical index of activity. Metabolic rate is an important determinant of the comfort or the strain resulting from exposure to a thermal environment. In particular, in hot climates, the high levels of metabolic heat production associated with muscular work aggravate heat stress, as large amounts of heat need to be dissipated, mostly by sweat evaporation.

ISO 8996:2004 specifies different methods for the determination of metabolic rate in the context of ergonomics of the climatic working environment. It can also be used for other applications -- for example, the assessment of working practices, the energetic cost of specific jobs or sport activities, the total cost of an activity, etc.

Replaced standards (1)
NF EN 28996
February 1994
Standard Cancelled
Ergonomics. Determination of metabolic heat production.

Standard replaced by (1)
NF EN ISO 8996
December 2021
Standard Current
Ergonomics of the thermal environment - Determination of metabolic rate

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.

Table of contents
  • Avant-propos
    iv
  • 1 Domaine d'application
    1
  • 2 Références normatives
    1
  • 3 Principes et précision
    1
  • 4 Niveau 1, typologies
    3
  • 4.1 Tableau d'estimation du métabolisme énergétique par professions
    3
  • 4.2 Classification du métabolisme énergétique par catégories
    3
  • 5 Niveau 2, observation
    4
  • 5.1 Estimation du métabolisme énergétique à partir des composantes de l'activité
    4
  • 5.2 Métabolisme énergétique pour des activités type
    4
  • 5.3 Métabolisme énergétique d'un cycle de travail
    4
  • 5.4 Influence de la durée des périodes de repos et des périodes de travail
    5
  • 5.5 Interpolation des valeurs
    6
  • 5.6 Exigences concernant l'application des tableaux d'évaluation du métabolisme énergétique
    6
  • 6 Niveau 3, analyse
    7
  • 6.1 Estimation du métabolisme énergétique à partir de la fréquence cardiaque
    7
  • 6.2 Relation entre fréquence cardiaque et métabolisme énergétique
    8
  • 7 Niveau 4, expertise
    9
  • 7.1 Détermination du métabolisme énergétique à partir du mesurage de la consommation d'oxygène
    9
  • 7.2 Méthode de l'eau doublement marquée pour les mesurages à long terme
    15
  • 7.3 Méthode calorimétrique directe - Principe
    15
  • Annexe A (informative) Évaluation du métabolisme énergétique au niveau 1, typologies
    16
  • Annexe B (informative) Évaluation du métabolisme énergétique au niveau 2, observation
    18
  • Annexe C (informative) Évaluation du métabolisme énergétique au niveau 3, analyse
    21
  • Annexe D (informative) Évaluation du métabolisme énergétique au niveau 4, expertise - Exemples de calcul du métabolisme énergétique basé sur des données mesurées
    22
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