Fergana branch of tashken university of information technologies named after al

Dynamic muscle 
work 
Use of muscles to generate force such that the length of the muscle changes 
during the activity, resulting in motion around a joint 
Endurance 
is the ability to continue to work, or in the static case, to continue to maintain a 
posture or position 
Energy 
Expenditure 
The amount of energy (power) used by the body at any point of time ... at work 
or at rest. It is usually expressed in terms of kilocalories per minute (kcal/min) 
or in terms of the amount of oxygen used (litres of O2) 
Fatigue 
Fatigue is a loss of work capacity resulting from preceding work. • It is usually 
associated with a loss of efficiency and reduced capability. • Fatigue is both a 
physical and a psychological state 
Frequency 
in ergonomics terms, refers to how often we repeat / do something. • The 
'units' of interest for frequency will vary depending on the task being looked at. 
For many repetitive type tasks we are interested in looking at frequency in 
terms of the number of repetition / actions per minute 
Glare 
There are two sorts of glare • – discomfort glare and disability glare. • The 
mechanisms of both are unknown, but the conditions under which discomfort 
glare occurs and the ways in which disability glare can affect performance are 

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well known 
Posture 
The general position of the whole body (e.g. standing, sitting, kneeling) or, 
more specifically, the position of any body part / joint with respect to adjacent 
body parts or the joint's full range of motion