Title

An investigation of heat stress effects on time-sharing performance

Authors

Authors

I. Vasmatzidis; R. E. Schlegel;P. A. Hancock

Comments

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Abbreviated Journal Title

Ergonomics

Keywords

heat stress; time-sharing; dual-task performance; multiple-task; performance; HIGH-TEMPERATURE; COMPLEX PERFORMANCE; MENTAL PERFORMANCE; MULTIPLE-RESOURCES; TASK-PERFORMANCE; BODY TEMPERATURE; TOLERANCE; LIMITS; HUMID CONDITIONS; VIGILANCE; EXPOSURE; Engineering, Industrial; Ergonomics; Psychology, Applied; Psychology

Abstract

A study was conducted to investigate the effects of heat stress on time-sharing performance. Twelve participants performed three dual-task scenarios and a multiple-task scenario for 2 h in each of six climates. The climates were obtained by generating each of three wet bulb globe temperatures (WBGT; 22, 28 and 34degreesC) with two relative humidity levels (30 and 70%). The dual tasks selected from the Criterion Task Set (CTS) were: (1) display monitoring with mathematical processing; (2) memory search with mathematical processing; and (3) unstable tracking with memory search. The multiple task scenario was generated using the SYNTASK software. The results indicated a significant heat stress effect on CTS display monitoring and unstable tracking performance and on the SYNTASK visual monitoring and auditory discrimination tasks. Additionally, at 34degreesC WBGT, 70% relative humidity was more detrimental to performance than 30% relative humidity. Results were interpreted using the Maximal Adaptability Model and Shingledecker's information processing stage/resource framework. To describe the results in an orderly manner, the authors propose the concept of heat stress selectivity effects. In addition, the results were used to evaluate whether the most recent NIOSH recommended heat stress standard, which is based solely on physiological and medical criteria, protects time-sharing performance. It was concluded that the NIOSH criterion does offer protection up to 28degreesC WBGT.

Journal Title

Ergonomics

Volume

45

Issue/Number

3

Publication Date

1-1-2002

Document Type

Article

Language

English

First Page

218

Last Page

239

WOS Identifier

WOS:000175200600004

ISSN

0014-0139

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