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Sleep and circadian rhythms in mining operators: limited evidence of adaptation to night shifts.
Appl Ergon. 2012 Jul; 43(4):695-701.AE

Abstract

Cumulative sleep deprivation is often associated with work patterns involving night shift or early morning shifts. Adaptation of the circadian system to the shift pattern is reported to promote improved duration and quality of sleep and a concurrent improvement in performance. The current study followed twenty-nine operators at a live-in mining operation working to a seven-day, seven-night shift pattern who collected saliva samples for melatonin measurement, recorded sleep using activity monitors and diaries, and underwent performance testing (psychomotor vigilance task) for one complete roster cycle. The time of onset of melatonin secretion changed significantly (P=0.022) across the week of both Day and Night shifts (2104 h ± 16 min versus 2130 h ± 16 min, respectively), but the small magnitude of the change indicates a lack of true circadian rhythm adaptation to the lifestyle. Total sleep time was longer following the seventh Day shift (associated with a period of 24 h off prior to the commencement of Night shifts). There were no other changes in total sleep time. Further, there were no improvements in sleep onset latency or sleep efficiency on Day or Night shifts. However, reaction times recorded at the end of the shifts slowed across the seven Day and seven Night shifts indicative of impairments in psychomotor performance (F(6,168)=6.087, P<0.001). The results suggest that previous reports of adaptation to consecutive night shifts cannot necessarily be applied to onshore or Australian environments. Adaptation is dependent on factors such as light exposure, environmental conditions, shift parameters such as wake-up, work start and work end times and individual characteristics.

Authors+Show Affiliations

Centre for Sleep Research, University of South Australia, Australia. sally.ferguson@unisa.edu.auNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

22133975

Citation

Ferguson, Sally A., et al. "Sleep and Circadian Rhythms in Mining Operators: Limited Evidence of Adaptation to Night Shifts." Applied Ergonomics, vol. 43, no. 4, 2012, pp. 695-701.
Ferguson SA, Kennaway DJ, Baker A, et al. Sleep and circadian rhythms in mining operators: limited evidence of adaptation to night shifts. Appl Ergon. 2012;43(4):695-701.
Ferguson, S. A., Kennaway, D. J., Baker, A., Lamond, N., & Dawson, D. (2012). Sleep and circadian rhythms in mining operators: limited evidence of adaptation to night shifts. Applied Ergonomics, 43(4), 695-701. https://doi.org/10.1016/j.apergo.2011.11.003
Ferguson SA, et al. Sleep and Circadian Rhythms in Mining Operators: Limited Evidence of Adaptation to Night Shifts. Appl Ergon. 2012;43(4):695-701. PubMed PMID: 22133975.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sleep and circadian rhythms in mining operators: limited evidence of adaptation to night shifts. AU - Ferguson,Sally A, AU - Kennaway,David J, AU - Baker,Angela, AU - Lamond,Nicole, AU - Dawson,Drew, Y1 - 2011/11/30/ PY - 2011/02/08/received PY - 2011/10/04/revised PY - 2011/11/02/accepted PY - 2011/12/3/entrez PY - 2011/12/3/pubmed PY - 2012/7/26/medline SP - 695 EP - 701 JF - Applied ergonomics JO - Appl Ergon VL - 43 IS - 4 N2 - Cumulative sleep deprivation is often associated with work patterns involving night shift or early morning shifts. Adaptation of the circadian system to the shift pattern is reported to promote improved duration and quality of sleep and a concurrent improvement in performance. The current study followed twenty-nine operators at a live-in mining operation working to a seven-day, seven-night shift pattern who collected saliva samples for melatonin measurement, recorded sleep using activity monitors and diaries, and underwent performance testing (psychomotor vigilance task) for one complete roster cycle. The time of onset of melatonin secretion changed significantly (P=0.022) across the week of both Day and Night shifts (2104 h ± 16 min versus 2130 h ± 16 min, respectively), but the small magnitude of the change indicates a lack of true circadian rhythm adaptation to the lifestyle. Total sleep time was longer following the seventh Day shift (associated with a period of 24 h off prior to the commencement of Night shifts). There were no other changes in total sleep time. Further, there were no improvements in sleep onset latency or sleep efficiency on Day or Night shifts. However, reaction times recorded at the end of the shifts slowed across the seven Day and seven Night shifts indicative of impairments in psychomotor performance (F(6,168)=6.087, P<0.001). The results suggest that previous reports of adaptation to consecutive night shifts cannot necessarily be applied to onshore or Australian environments. Adaptation is dependent on factors such as light exposure, environmental conditions, shift parameters such as wake-up, work start and work end times and individual characteristics. SN - 1872-9126 UR - https://www.unboundmedicine.com/medline/citation/22133975/Sleep_and_circadian_rhythms_in_mining_operators:_limited_evidence_of_adaptation_to_night_shifts_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0003-6870(11)00168-2 DB - PRIME DP - Unbound Medicine ER -