Applied aspects of chronoergohygiene.

Chronoergohygiene defines a field of study set on optimizing the work timing compared to the desiderata of human physiology in order to improve the working conditions. Production systems follow their own laws with a timing resulting from economic, technological and natural factors; this timing could contrast with che chronological variables of the person 'involved'. Important aspects to be considered in this regard concern: a energy expense and nutrition, in relation to the mechanization and automation of the working tasks, sociocultural models, individual behaviors in eating habits; b. work performance, with particular reference to the modifications during the life-span and the rhythmic variations in the circadian period; c. toxicologic risks, considering problems of chronokinetics of the toxic agent and of 'chronoesthesia' of the body functions and apparatuses; d. work and social organization, with special reference to shift work, work pace and commuting. The research for a dynamic evaluation of the human-machine interaction in time and into forms of chronological compatibility between man and work organization should optimize industrial hygiene.