The accuracy of subjective measures for assessing fatigue related decrements in multi-stressor environments

Abstract It has become increasingly common for rural fire-fighting agencies to encourage their volunteers to control and monitor their own levels of fatigue and performance abilities. Yet, the accuracy of subjective evaluations, especially during exposure to multi-stressor working conditions similar to those faced by rural fire-fighters has yet to be examined. A total of 91 rural fire-fighters took part in a 4-day/3-night live-in study that simulated a fire-ground tour. Fire-fighters were required to perform a total of 14 circuits that involved intermittent intense physical work, whilst exposed to heat, sleep deprivation, or a combination of both. Cognitive performance was measured using the Psychomotor Vigilance Task, with a self-reported measure of performance obtained before each cognitive battery. Overall, participants were able to predict their cognitive performance, however, there was a variety of factors involved in accuracy, including individual differences, and contributory factors fatigue such as environmental stressors, the length of shift, and the number of days worked. Subjective judgments appear to offer an effective, efficient, and cost effective tool in providing feedback in regard to in continuing work. In order for these to be effective however, subjective assessments should not be used in isolation, and fire-fighters must be trained, informed and given the tools to be able to recognise and monitor their own fatigue.

[1]  C. Sargent,et al.  INTERINDIVIDUAL DIFFERENCES IN NEUROBEHAVIORAL PERFORMANCE IN RESPONSE TO INCREASING HOMEOSTATIC SLEEP PRESSURE , 2010, Chronobiology international.

[2]  J. Dorrian,et al.  The ability to self‐monitor performance when fatigued , 2000, Journal of sleep research.

[3]  C. Sargent,et al.  The influence of circadian time and sleep dose on subjective fatigue ratings. , 2012, Accident; analysis and prevention.

[4]  J. Baranski,et al.  Self‐monitoring cognitive performance during sleep deprivation: effects of modafinil, d‐amphetamine and placebo , 2003, Journal of sleep research.

[5]  N. Lowe,et al.  A critical review of visual analogue scales in the measurement of clinical phenomena. , 1990, Research in nursing & health.

[6]  Jd Clark J. Lee.  Addressing emergency response provider fatigue in emergency response preparedness, management, policy making, and research , 2011 .

[7]  H. Babkoff,et al.  Subjective sleepiness ratings: the effects of sleep deprivation, circadian rhythmicity and cognitive performance. , 1991, Sleep.

[8]  Wendy Macdonald,et al.  Effects of workload level and 8- versus 12-h workday duration on test battery performance , 2000 .

[9]  Ann Mills,et al.  Fatigue risk management: Organizational factors at the regulatory and industry/company level. , 2011, Accident; analysis and prevention.

[10]  J. McLennan,et al.  A potential crisis in wildfire emergency response capability? Australia's volunteer firefighters , 2005 .

[11]  Mollie E. Brooks,et al.  Generalized linear mixed models: a practical guide for ecology and evolution. , 2009, Trends in ecology & evolution.

[12]  Brad Aisbett,et al.  Validating 'fit for duty' tests for Australian volunteer fire fighters suppressing bushfires. , 2012, Applied ergonomics.

[13]  L. Shattuck,et al.  Sleep and Fatigue Issues in Continuous Operations: A Survey of U.S. Army Officers , 2011, Behavioral sleep medicine.

[14]  Maarten A. S. Boksem,et al.  Mental fatigue, motivation and action monitoring , 2006, Biological Psychology.

[15]  David Nichols,et al.  Fighting fatigue whilst fighting bushfire : an overview of factors contributing to firefighter fatigue during bushfire suppression , 2007 .

[16]  Philip J. Niro,et al.  Severe decrements in cognition function and mood induced by sleep loss, heat, dehydration, and undernutrition during simulated combat , 2005, Biological Psychiatry.

[17]  Neil Greenberg,et al.  Do stigma and other perceived barriers to mental health care differ across Armed Forces? , 2010, Journal of the Royal Society of Medicine.

[18]  Maria L. Thomas,et al.  Patterns of performance degradation and restoration during sleep restriction and subsequent recovery: a sleep dose‐response study , 2003, Journal of sleep research.

[19]  Sherwood W Samn,et al.  Estimating Aircrew Fatigue: A Technique with Application to Airlift Operations , 1982 .

[20]  Drew Dawson,et al.  Fatigue assessment in the field: validation of a hand-held electronic psychomotor vigilance task. , 2005, Aviation, space, and environmental medicine.

[21]  D. Dinges,et al.  Systematic interindividual differences in neurobehavioral impairment from sleep loss: evidence of trait-like differential vulnerability. , 2004, Sleep.

[22]  Stephen H. Fairclough,et al.  Impairment of Driving Performance Caused by Sleep Deprivation or Alcohol: A Comparative Study , 1999, Hum. Factors.

[23]  B. Aisbett,et al.  Sleeping at work: not all about location, location, location. , 2015, Sleep medicine reviews.

[24]  T. Sharot.  The optimism bias , 2011, Current Biology.

[25]  S. Hursh,et al.  Fatigue Risk Management in the Workplace , 2012, Journal of occupational and environmental medicine.

[26]  M. Blagrove,et al.  Effects of sleep loss on confidence-accuracy relationships for reasoning and eyewitness memory. , 2000, Journal of experimental psychology. Applied.

[27]  J. Dorrian,et al.  The ability to self-monitor performance during a week of simulated night shifts. , 2003, Sleep.

[28]  Adam Fletcher,et al.  Simulated train driving: fatigue, self-awareness and cognitive disengagement. , 2007, Applied ergonomics.

[29]  Bradley P. Smith,et al.  Fatigue in Emergency Services Operations: Assessment of the Optimal Objective and Subjective Measures Using a Simulated Wildfire Deployment , 2016, International journal of environmental research and public health.

[30]  S A Ferguson,et al.  "Awake, smoky, and hot": providing an evidence-base for managing the risks associated with occupational stressors encountered by wildland firefighters. , 2012, Applied ergonomics.

[31]  Heather N. Odle-Dusseau,et al.  SUBJECTIVE PERCEPTIONS OF THE EFFECTS OF SUSTAINED PERFORMANCE UNDER SLEEP-DEPRIVATION CONDITIONS , 2010, Chronobiology international.

[32]  J. Baranski,et al.  On the ability to self‐monitor cognitive performance during sleep deprivation: a calibration study , 1994, Journal of sleep research.

[33]  G. Kecklund,et al.  Relations between performance and subjective ratings of sleepiness during a night awake. , 1994, Sleep.

[34]  Sally A. Ferguson,et al.  Design of a valid simulation for researching physical, physiological and cognitive performance in volunteer firefighters during bushfire deployment. , 2011 .

[35]  Drew Dawson,et al.  Managing fatigue: it's about sleep. , 2005, Sleep medicine reviews.