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PubMed2001

Shiftwork locus of control effects in police officers.

Personality and experientially-based differences are suggested to moderate the negative effects of shiftworking. This investigation was one of a series of studies aimed at examining the relationship between internal locus of control (internality) and commonly reported outcomes of exposure to shiftworking. The study concentrated on whether or not shiftwork-specific internality appeared to be associated with better experiences for two groups of shiftworkers on different shift rotas. The Shiftwork Locus of Control (SHLOC) scale was completed by each group along with a range of outcome measures (including: sleep disturbance, alertness on shift, psychological well-being, disturbance of social and family life, and fatigue). The analyses controlled for for age, shiftwork experience and years of service effects. The results showed that for the majority of outcome variables, the higher internality was associated with significantly lower levels of shiftwork problems, especially when compared to the low internality group. The findings of this study further support the use of shiftwork-specific locus of control in shiftwork research as an indicator of potentially better tolerance, and possibly as part of an occupational health monitoring process to aid the targeting of interventions.

Adaptation, Psychological↗
PubMed2002

[Difference in lymphocyte heat shock protein 71 (HSP71) expression in soldiers of armed police forces from different climatic zones].

OBJECTIVE: To analyze the difference between basal and heat-inducible levels of lymphocyte heat shock protein 71 (HSP71) expression in soldiers from Beijing, Zhengzhou and Guangzhou. METHODS: Flow cytometry and Comet assay were used to detect the level of HSP71 and DNA damage respectively. RESULTS: Comet assay showed that there was no significant DNA damage before and after heat stress at 41 degrees C for 1 h, and also no difference found among the 3 climatic zones(P > 0.05). HSP71 of all soldiers in the 3 zones elevated after stress (P < 0.05). The basal and heat-inducible levels of HSP71 in Beijing soldiers(845.87 +/- 135.60 and 1254. 47 +/- 239.05 mean fluorescence intensity respectively) were higher than those in Guangzhou soldiers(702.73 +/- 184.70 and 861.72 +/- 225.12 mean fluorescence intensity respectively) (P < 0.05). CONCLUSION: The differences of lymphocyte HSP71 expression before and after heat stress among the soldiers from Beijing, Zhengzhou and Guangzhou suggest that basal and heat-inducible levels of lymphocyte HSP71 expression may be considered as a valuable index to evaluate heat tolerance of soldiers in different climatic zones.

Climate↗