Table 2.

Work heaviness classification in terms of energy expenditure

Workload categories				Energy expenditure
NIOSH (USA) standard [4], ISO 28996		Russian standards of hygiene [5]		Male, kcal/min	Female, kcal/min
Light work	I	Light work	I	2.0 – 4.9	1.5 – 3.4
Moderate work	II	Permissible work	II	5.0 – 7.4	3.5 – 5.4
Hard work	III	Moderate work	II.1	7.5 – 9.9	5.5 – 7.4
Very hard work	IV	Hard work	II.2	10.0 – 12.4	7.5 – 9.4
Ultimate work	V	Excessively hard work	III	more 12.5	more 9.5