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Performance and alertness on 8 h and 12 h rotating shifts at a natural gas utility.

Authors
Rosa-RR; Bonnet-MH
Source
Ergonomics 1993 Oct; 36(10):1177-1193
NIOSHTIC No.
00217689
Abstract
A study was conducted on the levels of performance and alertness of employees using two different workshift schedules. Workers at a natural gas utility worked 8 or 12 hour rotating day and night shift schedules and levels of performance and alertness were measured using computerized tests as well as self reports. Those on the 12 hour shift schedule had significantly better scores on two computerized measures of performance and reported feeling less sleepy than those on the 8 hour schedule. Significantly more frequent simple reaction time misses and hand tremors were seen during the 12 hour shifts. Those on the 12 hour shifts reported higher subjective workloads compared with the 8 hour shift workers. Multiple regression analyses indicated that there were circadian fluctuations in performance and subjective state and most measures showed declines at night. The worst performance, with the exception of digit addition, was seen using the 12 hour shift schedule. Daily sleep and habit shift scores demonstrated few similarities between the repeated measures and between groups analyses of variance of average shift scores. A decline in total sleep time was seen across the work week of 12 hour shifts. The authors recommend caution when scheduling important activities during extended workshifts, especially on extended nightshifts.
Keywords
NIOSH-Author; Shift-work; Shift-workers; Circadian-rhythms; Work-performance; Psychological-effects; Fatigue
CODEN
ERGOAX
Publication Date
19931001
Document Type
Journal Article
Fiscal Year
1994
NTIS Accession No.
NTIS Price
Issue of Publication
10
ISSN
0014-0139
NIOSH Division
DBBS
Source Name
Ergonomics
State
OH
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