{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,8]],"date-time":"2026-07-08T19:17:25Z","timestamp":1783538245699,"version":"3.55.0"},"reference-count":27,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2016,1,29]],"date-time":"2016-01-29T00:00:00Z","timestamp":1454025600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["IJERPH"],"abstract":"<jats:p>Under controlled laboratory conditions, neurobehavioral assays such as the Psychomotor Vigilance Task (PVT) are sensitive to increasing levels of fatigue, and in general, tend to correlate with subjective ratings. However, laboratory studies specifically curtail physical activity, potentially limiting the applicability of such findings to field settings that involve physical work. In addition, laboratory studies typically involve healthy young male participants that are not always representative of a typical working population. In order to determine whether these findings extend to field-like conditions, we put 88 Australian volunteer firefighters through a multi-day firefighting simulation. Participants were required to perform real-world physical and cognitive tasks under conditions of elevated temperature and moderate sleep restriction. We aimed to examine changes in fatigue in an effort to determine the optimum objective and subjective measures. Objective and subjective tests were sensitive to fatigue outside laboratory conditions. The PVT was the most sensitive assay of objective fatigue, with the Samn-Perelli fatigue scale the most sensitive of the subjective measures. The Samn-Perilli fatigue scale correlated best with PVT performance, but explained a small amount of variance. Although the Samn-Perelli scale can be easily administered in the field, the wide range of individual variance limits its efficacy as a once-off assessment tool. Rather, fatigue measures should be applied as a component of a broader fatigue risk management system. Findings provide firefighting agencies, and other occupations involving physical work, guidance as to the most sensitive and specific measures for assessing fatigue in their personnel.<\/jats:p>","DOI":"10.3390\/ijerph13020171","type":"journal-article","created":{"date-parts":[[2016,1,29]],"date-time":"2016-01-29T09:58:48Z","timestamp":1454061528000},"page":"171","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":28,"title":["Fatigue in Emergency Services Operations: Assessment of the Optimal Objective and Subjective Measures Using a Simulated Wildfire Deployment"],"prefix":"10.3390","volume":"13","author":[{"given":"Sally","family":"Ferguson","sequence":"first","affiliation":[{"name":"Central Queensland University, Appleton Institute, Adelaide 5034, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0873-3917","authenticated-orcid":false,"given":"Bradley","family":"Smith","sequence":"additional","affiliation":[{"name":"Central Queensland University, Appleton Institute, Adelaide 5034, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2668-6229","authenticated-orcid":false,"given":"Matthew","family":"Browne","sequence":"additional","affiliation":[{"name":"School of Human Health and Social Sciences, Central Queensland University, North Rockhampton QLD 4701, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Matthew","family":"Rockloff","sequence":"additional","affiliation":[{"name":"School of Human Health and Social Sciences, Central Queensland University, North Rockhampton QLD 4701, Australia"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2016,1,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"298","DOI":"10.1177\/001872089403600210","article-title":"Driver fatigue","volume":"36","author":"Brown","year":"1994","journal-title":"Hum. Factors"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"48","DOI":"10.1016\/j.trf.2015.01.003","article-title":"A review of fatigue- and a step towards a whole definition","volume":"29","author":"Phillips","year":"2015","journal-title":"Transp. Res. Part F"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"365","DOI":"10.1016\/j.smrv.2005.03.002","article-title":"Managing Fatigue: It\u2019s about sleep","volume":"9","author":"Dawson","year":"2005","journal-title":"Sleep Med. Rev."},{"key":"ref_4","unstructured":"Kryger, M., Roth, T., and Dement, W. (2010). Principles and Practices of Sleep Medicine, W.B. Saunders Company."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1097\/JOM.0b013e318247a3b0","article-title":"ACOEM Guidance Statement. Fatigue risk management in the workplace","volume":"54","author":"Lerman","year":"2012","journal-title":"J. Occup. Environ. Med."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1046\/j.1365-2869.2003.00337.x","article-title":"Patterns of performance degradation and restoration during sleep restriction and subsequent recovery: A sleep dose-response study","volume":"12","author":"Belenky","year":"2003","journal-title":"J. Sleep Res."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"498","DOI":"10.1016\/j.aap.2009.11.011","article-title":"The link between fatigue and safety","volume":"43","author":"Willamson","year":"2011","journal-title":"Accid. Anal. Prev."},{"key":"ref_8","first-page":"267","article-title":"Cumulative sleepiness, mood disturbance, and psychomotor vigilance performance decrements during a week of sleep restricted to 4\u20135 h per night","volume":"20","author":"Dinges","year":"1997","journal-title":"Sleep"},{"key":"ref_9","doi-asserted-by":"crossref","unstructured":"Kushida, C. (2005). Sleep Deprivation: Clinical Issues, Pharmacology, and Sleep Loss Effects, Marcel Dekker.","DOI":"10.3109\/9780203998007"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"137","DOI":"10.1046\/j.1365-2869.2000.00195.x","article-title":"The ability to self-monitor performance when fatigued","volume":"9","author":"Dorrian","year":"2000","journal-title":"J. Sleep Res."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"271","DOI":"10.1080\/07420520802110589","article-title":"Effects of context on sleepiness self-ratings during repeated partial sleep deprivation","volume":"25","author":"Akerstedt","year":"2008","journal-title":"Chronobiol. Int."},{"key":"ref_12","first-page":"31","article-title":"Fighting fatigue whilst fighting bushfire: An overview of factors contributing to firefighter fatigue during bushfire suppression","volume":"22","author":"Aisbett","year":"2007","journal-title":"Aust. J. Emerg. Manag."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"916","DOI":"10.1016\/j.apergo.2011.12.013","article-title":"\u201cAwake, smoky and hot\u201d: Providing an evience-base for managing the risks associated with occupational stressors encountered by wildland firefighters","volume":"43","author":"Aisbett","year":"2012","journal-title":"Appl. Ergon."},{"key":"ref_14","first-page":"101","article-title":"A potential crisis in wildfire emergency response capability? Australia\u2019s volunteer firefighters","volume":"6","author":"McLennan","year":"2005","journal-title":"Glob. Environ. Change Part B: Environ. Hazards"},{"key":"ref_15","unstructured":"Thornton, R. (2011, January 1). Design of a valid simulation for researching physical, physiological and cognitive performance in volunteer firefighters during bushfire. Proceedings of the Bushfire CRC & AFAC 2011 Conference Science Day, Sydney, Australia."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"435","DOI":"10.1016\/j.apergo.2011.06.018","article-title":"Identification of physically demanding tasks performed during bushfire suppression by Australian rural firefighters","volume":"43","author":"Phillips","year":"2012","journal-title":"Appl. Ergon."},{"key":"ref_17","doi-asserted-by":"crossref","unstructured":"Vincent, G., Ferguson, S., Tran, J., Larsen, B., Wolkow, A., and Aisbett, B. (2015). Sleep restriction during simulated wildfire suppression: Effect on physical task performance. PLoS ONE, 10.","DOI":"10.1371\/journal.pone.0115329"},{"key":"ref_18","first-page":"486","article-title":"Fatigue assessment in the field: Validation of a hand-held electronic psychomotor vigilance task","volume":"76","author":"Lamond","year":"2005","journal-title":"Aviat. Space Environ. Med."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"111","DOI":"10.3758\/BF03206404","article-title":"The Walter Reed palm-held psychomotor vigilance test","volume":"37","author":"Thorne","year":"2005","journal-title":"Behav. Res. Methods"},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/j.bandc.2011.03.005","article-title":"One night sleep deprivation affects reaction time, but not interference or facilitation in a stroop task","volume":"76","author":"Cain","year":"2011","journal-title":"Brain Cognit."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1037\/0033-2909.109.2.163","article-title":"Half a century of research on the Stroop effect: An integrative review","volume":"109","author":"MacLeod","year":"1991","journal-title":"Psychol. Bull."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"261","DOI":"10.1111\/j.1365-2869.2006.00535.x","article-title":"Effects of two nights sleep deprivation and two nights recovery sleep on response inhibition","volume":"15","author":"Drummond","year":"2006","journal-title":"J. Sleep Res."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"186","DOI":"10.2486\/indhealth.43.186","article-title":"The impact of sustained wakefulness and time-of-day on OSPAT performance","volume":"43","author":"Petrilli","year":"2005","journal-title":"Ind. Health"},{"key":"ref_24","unstructured":"Samn, S., and Perelli, L. (1982). Estimating Aircrew Fatigue: A Technique with Application to Airlift Operations, Brooks AFB, USAF School of Aerospace Medicine. Technical Report SAM-TR-82-21."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"227","DOI":"10.1002\/nur.4770130405","article-title":"A critical review of visual analogue scales in the measurement of clinical phenomena","volume":"13","author":"Wewers","year":"1990","journal-title":"Res. Nurs. Health"},{"key":"ref_26","first-page":"236","article-title":"The impact of sleep deprivation on decision making: A review","volume":"6","author":"Harrison","year":"2000","journal-title":"J. Exp. Psychol."},{"key":"ref_27","first-page":"423","article-title":"Systematic interindividual differences in neurobehavioural impairment from sleep loss: Evidence of trait-like differential vulnerability","volume":"27","author":"Baynard","year":"2004","journal-title":"Sleep"}],"container-title":["International Journal of Environmental Research and Public Health"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1660-4601\/13\/2\/171\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T19:18:31Z","timestamp":1760210311000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1660-4601\/13\/2\/171"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2016,1,29]]},"references-count":27,"journal-issue":{"issue":"2","published-online":{"date-parts":[[2016,2]]}},"alternative-id":["ijerph13020171"],"URL":"https:\/\/doi.org\/10.3390\/ijerph13020171","relation":{},"ISSN":["1660-4601"],"issn-type":[{"value":"1660-4601","type":"electronic"}],"subject":[],"published":{"date-parts":[[2016,1,29]]}}}