An investigation of heat stress effects on time-sharing performance

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 34°C) 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 34°C 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 28°C WBGT.

[1]  E. Duffy,et al.  The concept of energy mobilization. , 1951, Psychological review.

[2]  S. S. Stevens,et al.  Handbook of experimental psychology , 1951 .

[3]  D. Hebb.  Drives and the C.N.S. (conceptual nervous system). , 1955, Psychological review.

[4]  E. Duffy,et al.  The psychological significance of the concept of arousal or activation. , 1957, Psychological review.

[5]  W. Chiles.  EFFECTS OF ELEVATED TEMPERATURES ON PERFORMANCE OF A COMPLEX MENTAL TASK , 1958 .

[6]  A. Bursill.  The Restriction of Peripheral Vision during Exposure to Hot and Humid Conditions , 1958 .

[7]  R. D. Pepler,et al.  WARMTH AND PERFORMANCE : AN INVESTIGATION IN THE TROPICS , 1958 .

[8]  Elizabeth Duffy,et al.  Activation and behavior , 1962 .

[9]  R. Wilkinson,et al.  PSYCHOLOGICAL AND PHYSIOLOGICAL RESPONSES TO RAISED BODY TEMPERATURE. , 1964, Journal of applied physiology.

[10]  K. A. Provins,et al.  VISUAL AND AUDITORY VIGILANCE DURING EXPOSURE TO HOT AND HUMID CONDITIONS , 1964 .

[11]  E. Poulton,et al.  INITIAL STIMULATING EFFECT OF WARMTH UPON PERCEPTUAL EFFICIENCY. , 1965, Aerospace medicine.

[12]  Wing Jf,et al.  Upper thermal tolerance limits for unimpaired mental performance. , 1965 .

[13]  Wing Jf,et al.  The effects of high ambient temperature on short-term memory. AMRL-TR-65-103. , 1965 .

[14]  J F Wing,et al.  Upper thermal tolerance limits for unimpaired mental performance. , 1965, Aerospace medicine.

[15]  K. A. Provins,et al.  Environmental heat, body temperature and behaviour: An hypothesis1 , 1966 .

[16]  C S Blyth,et al.  Effects of d-amphetamine sulfate, caffeine, and high temperature on human performance. , 1967, Research quarterly.

[17]  W P Colquhoun,et al.  Effects of raised ambient temperature and event rate on vigilance performance. , 1969, Aerospace medicine.

[18]  E A Higgins,et al.  COMPLEX PERFORMANCE DURING EXPOSURE TO HIGH TEMPERATURES , 1969 .

[19]  Colquhoun Wp,et al.  Effects of raised ambient temperature and event rate on vigilance performance. , 1969 .

[20]  K. A. Provins,et al.  Effects of heat stress on the performance of two tasks running concurrently. , 1970, Journal of experimental psychology.

[21]  I D Griffiths,et al.  Performance and thermal comfort. , 1971, Ergonomics.

[22]  M. Key.  National Institute for Occupational Safety and Health; occupational exposure to inorganic lead: request for comments and information; republication--NIOSH. Request for comments and information relevant to occupational exposure to inorganic lead. , 1997, Federal register.

[23]  W P Colquhoun,et al.  Vigilance under induced hyperthermia. , 1972, Ergonomics.

[24]  N. Z. Azer,et al.  Effects of heat stress on performance. , 1972, Ergonomics.

[25]  P F Iampietro,et al.  High temperature and performance in a flight task simulator. , 1972, Aerospace medicine.

[26]  W D Chiles,et al.  Combined Effects of Altitude and High Temperature on Complex Performance , 1972, Human factors.

[27]  D. Kahneman,et al.  Attention and Effort , 1973 .

[28]  J D Ramsey,et al.  Monitoring performance as a function of work-rest schedule and thermal stress. , 1973, American Industrial Hygiene Association journal.

[29]  R. S. Edwards,et al.  The interaction of the loss of a night's sleep with mild heat: task variables. , 1974, Ergonomics.

[30]  J D Ramsey,et al.  Heat stress limits for the sedentary worker. , 1975, American Industrial Hygiene Association journal.

[31]  K. Pribram,et al.  Arousal, activation, and effort in the control of attention. , 1975, Psychological review.

[32]  J. D. Ramsey,et al.  Thermostat variations and sedentary job performance. [At 68, 78, and 84/sup 0/F] , 1976 .

[33]  S A Nunneley,et al.  Tracking-task performance during heat stress simulating cockpit conditions in high-performance aircraft. , 1979, Ergonomics.

[34]  Christopher D. Wickens,et al.  The Structure of Attentional Resources , 1980 .

[35]  Daniel Gopher,et al.  On the Training of Time Sharing Skills: An Attention Viewpoint , 1980 .

[36]  M. Reivich,et al.  ACTIVATION , 1980, The Social Value of Zoos.

[37]  P A Hancock,et al.  Heat stress impairment of mental performance: a revision of tolerance limits. , 1981, Aviation, space, and environmental medicine.

[38]  J D Ramsey,et al.  Comparison between male and female subjective estimates of thermal effects and sensations. , 1981, Applied ergonomics.

[39]  D Gopher,et al.  Different difficulty manipulations interact differently with task emphasis: evidence for multiple resources. , 1982, Journal of experimental psychology. Human perception and performance.

[40]  M. Y. Beshir,et al.  Effects of workplace thermal conditions on safe work behavior , 1983 .

[41]  C A Shingledecker,et al.  A Task Battery for Applied Human Performance Assessment Research. , 1984 .

[42]  Peter A. Hancock,et al.  Arousal Theory, Stress And Performance: Problems Of Incorporating Energetic Aspects Of Behavior Into Human-Machine Systems Function , 1987 .

[43]  M C Polson,et al.  Task-Sharing within and between Hemispheres: A Multiple-Resources Approach , 1988, Human factors.

[44]  P. Hancock.  The Effect of Gender and Time of Day Upon the Subjective Estimate of Mental Workload During the Performance of a Simple Task , 1988 .

[45]  P. Hancock,et al.  Human Mental Workload , 1988 .

[46]  P. Hancock,et al.  A Dynamic Model of Stress and Sustained Attention , 1989, Human factors.

[47]  Yeong G. Kwon,et al.  Recommended alert limits for perceptual motor loss in hot environments , 1992 .

[48]  Robert E. Schlegel,et al.  A Methodology for Investigating Heat Stress Selectivity Effects on Mental Performance , 1994 .

[49]  J. Ramsey,et al.  Task performance in heat: a review. , 1995, Ergonomics.

[50]  Attention! , 1998, Trends in Cognitive Sciences.

[51]  P A Hancock,et al.  Human occupational and performance limits under stress: the thermal environment as a prototypical example. , 1998, Ergonomics.