The effect of hot and humid weather on the level of mental workload among managers and supervisors on a project of South Pars phases, Iran

AbstractDespite the physiological response of the body to heat has been modeled and described well, the effects of heat stress on cognitive ability are still not well understood. This study aims at measuring mental work load and specifically the effects of hot and humid weather on the level of mental work load among managers and supervisors working on a project of South Pars phases in Bushier (one of the province in south of Iran) . This study is descriptive–analytic and was carried out in two phases: the first phase in winter (February and March 2012) and the second one in summer (July and August 2013). A total of 98 managers and supervisors completed the questionnaires. Method of implementing was the same in both phases, and the same sample took part in both phases. The temperature and humidity information were obtained from synoptic stations. Results of this study showed that there is a direct relationship between the prevailing weather conditions in summer and mental work load. With increasing temperature and relative humidity and in sultry conditions, mental work load of managers and supervisors increased. Based on the results obtained, mental work load of managers and supervisors in South Pars phase projects is high. Nowadays, along with new jobs, work environments are getting more complex and require higher mental activities. Therefore, in addition to assessing physical work load, evaluating mental work load is very important. Also, to reduce mental work load, identifying its causes and factors affecting it is essential. Climate is a potential factor influencing mental work load.

[1]  Low Sui Pheng,et al.  Environmental factors and work performance of project managers in the construction industry , 2006 .

[2]  P. Bell.  Physiological, Comfort, Performance, and Social Effects of Heat Stress , 1981 .

[3]  Amran Rasli,et al.  Essential Competencies for the Supervisors of Oil and Gas Industrial Companies , 2012 .

[4]  Bell Cr,et al.  Effects of high temperature environmental conditions on human performance. , 1962 .

[5]  H. C. Sommer,et al.  Effects of combined heat, noise and vibration stress on human performance and physiological functions. , 1971, Aerospace medicine.

[6]  J. Kobrick,et al.  Effects of Hot and Cold Environments on Military Performance , 1988 .

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

[8]  R. Wilkinson,et al.  Some factors influencing the effect of environmental stressors upon performance. , 1969, Psychological bulletin.

[9]  P A Hancock,et al.  Effects of heat stress on cognitive performance: the current state of knowledge , 2003, International journal of hyperthermia : the official journal of European Society for Hyperthermic Oncology, North American Hyperthermia Group.

[10]  W. Karwowski.  International encyclopedia of ergonomics and human factors , 2001 .

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

[12]  J D Ramsey,et al.  Isodecrement curves for task performance in hot environments. , 1978, Applied ergonomics.

[13]  S. Shirreffs,et al.  Heat and Cold , 2007, Sports medicine.

[14]  N. Mackworth.  The Breakdown of Vigilance during Prolonged Visual Search 1 , 1948 .

[15]  S. Hart,et al.  Development of NASA-TLX (Task Load Index): Results of Empirical and Theoretical Research , 1988 .

[16]  M. Wertheimer.  Can a Trained Subject Judge his Auditory Sensitivity? , 1954 .

[17]  R. Pepler,et al.  Warmth and lack of sleep: accuracy or activity reduced. , 1959, Journal of comparative and physiological psychology.

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

[19]  W F Grether,et al.  Human performance at elevated environmental temperatures. , 1973, Aerospace medicine.

[20]  June J. Pilcher,et al.  Effects of hot and cold temperature exposure on performance: a meta-analytic review , 2002, Ergonomics.

[21]  Jim Saxton,et al.  JOINT ECONOMIC COMMITTEE , 1998 .

[22]  K. A. Provins,et al.  Effects of high temperature environmental conditions on human performance. , 1962, Journal of occupational medicine. : official publication of the Industrial Medical Association.

[23]  J. Ramsey,et al.  Sedentary Work by Females in Hot Environments , 1975 .

[24]  Ashraf A. Shikdar,et al.  Ergonomics, and occupational health and safety in the oil industry: a managers' response , 2004, Comput. Ind. Eng..

[25]  Li Lan,et al.  The effects of air temperature on office workers' well-being, workload and productivity-evaluated with subjective ratings. , 2010, Applied ergonomics.

[26]  John L. Kobrick,et al.  Effects of Altitude and Heat on Complex Cognitive Tasks , 1978 .

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

[28]  R. Hockey.  Stress and fatigue in human performance , 1984 .

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

[30]  R. D. Pepler,et al.  WARMTH, GLARE AND A BACKGROUND OF QUIET SPEECH: A COMPARISON OF THEIR EFFECTS ON PERFORMANCE , 1960 .

[31]  Angela Didomenico,et al.  Effects of different physical workload parameters on mental workload and performance , 2011 .

[32]  Mohammad Reza Meshkani,et al.  Spatial Analysis of Humidity and Temperature of Iran , 2009, ICCSA.

[33]  S Razmjou.  Mental workload in heat: toward a framework for analyses of stress states. , 1996, Aviation, space, and environmental medicine.

[34]  Pepler Rd,et al.  Warmth and lack of sleep: accuracy or activity reduced. , 1959 .

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

[36]  H. Hensel,et al.  Heat and cold. , 1959, Annual review of physiology.