Relationship between sleep quality and blood pressure level in nurses performing shift work

Objective:The aim of the study was to evaluate the quality of sleep in nurses performing shift work in therapeutic and surgical depar tments and to establish possible relationships between level of blood pressure(BP)and quality of sleep.Methods:A total of 20 nurses of the therapeutic depar tments and 20 nurses of the surgical depar tments were enrolled in the study.Sleep quality was assessed using the Pittsburgh Sleep Quality Index(PSQI).BP was measured according to the standard protocol using the Korotkoff method;a sphygmomanometer was used for this twice with an interval of 2 min between 10:00 a.m.and 10:30 a.m.The average value for the 2 indicators was calculated.The diagnosis of essential ar terial hyper tension(AH)was established according to the recommendations of the European Association of Cardiology and the European Association of Hypertension(2018).Results:The overall assessment of the sleep quality of the nurses involved in shift work indicates poor sleep quality;this was true in respondents of both the surgical and therapeutic profiles.However,it was observed that the quality of sleep was significantly lower in nurses of the therapeutic departments.Moreover,poor sleep quality was associated with AH,which was diagnosed in 65%of the nurses of the therapeutic departments and 45%of the nurses of the surgical departments,that is,in almost all of the subjects.Herewith,in the nurses of the therapeutic departments,the level of systolic BP exceeded that of the nurses of the surgical departments.Conclusions:Poor sleep quality is a significant risk factor for AH development and is relevant to nurses performing shift work.Additional clinical studies should be conducted to better understand the mechanisms underlying such adverse cardiometabolic outcomes associated with sleep disorders in the health-sector shift workers.

Shift work aggravates metabolic syndrome development among early-middle-aged males with elevated ALT

AIM: To examine whether shift work accelerates metabolic syndrome (MetS) development among early middle-aged males with elevated alanine aminotransferase (e-ALT).METHODS: A retrospective, observational followup study on MetS development at a 5-year interval was conducted using health examination data. Nine hundred and ninety six male employees not fulfi lling MetS criteria at screening were enrolled. Age, MetScomponents, liver enzymes, serological markers for viral hepatitis, abdominal ultrasound, insulin resistance status, lifestyles, and workplace factors were analyzed.RESULTS: The prevalence of elevated serum ALT (> 40 U/L, e-ALT) at baseline was 19.1%. There were 381 (38.3%) workers with long-term exposures to day-night rotating shift work (RSW). 14.2% of subjects developed MetS during follow-up. After 5 years, the workers with e-ALT had significantly unfavorable changes in MetS-components, and higher rates of MetS development, vs subjects with normal baseline ALT levels. Workers with both baseline e-ALT and 5-year persistent RSW (pRSW) exposure had the highest rate of MetS development. Also, e-ALT-plus-pRSW workers had a significant increase in MetS-components atfollow-up, compared with the other subgroups. After controlling for potential confounders, e-ALT-plus-pRSW workers posed a signifi cant risk for MetS development (odds ratio, 2.7; 95% confi dence interval, 1.4-5.3, vs workers without baseline e-ALT nor pRSW). CONCLUSION: We suggest that all early middle-aged male employees with e-ALT should be evaluated and managed for MetS. Particularly in terms of job arrangements, impacts of long-term RSW on MetS development should be assessed for all male employees having baseline e-ALT.

Dietary, Anthropometric, Biochemical and Psychiatric Indices in Shift Work Nurses

Objectives: The aim of this study was to compare nutrients intake, anthropometric, biochemical and psychiatric indices between shift working and day-time nurses. Methods: A cross-sectional comparative study was conducted in which ninety eight female nurses (55 day-time workers and 43 shift workers) from six educational hospitals of Jondi-Shapour University of medical sciences, Ahvaz, Iran were participated. A questionnaire including dietary, anthropometric, disease history and lifestyle pattern questions was completed and 3-day 24-hour recalls, Beck Depression Inventory (BDI) and Hospital Anxiety and Depression Scale (HADS) were collected. Serum hs-CRP and 25(OH)D3 concentrations were measured by immunoturbidimetric and electrochemiluminescent immunoassay method, respectively. Anthropometric indices were measured according to World health organization standard protocol. Independent sample t and chi-square tests were used for statistical analysis. Results: There was a lower dietary intake of thiamin, riboflavin, niacin, folate, magnesium and iron in shift worker compared with day-time nurses (p < 0.05). No significant differences in serum hs-CRP concentrations, serum 25(OH)D3 levels, vitamin D deficiency percentage, hemoglobin and hematocrite concentrations, and also anthropometric and psychiatric variables were found between two groups. Duration of exposure to sunlight was significantly higher in shift workers than in day time nurses. Engagement time in weekly physical exercise was around 11 times greater in day-time nurses compared with the shift work nurses (p = 0.001). Conclusions: This study showed that shift working is associated with some nutritional deficiencies and sedentary lifestyle among female nurses.

The Effect of Stress, Fatigue, and Sleep Quality on Shift-Work Nurses in Japan

Purpose: To investigate the relationship between stress, fatigue and sleep quality among shift work nurses in Japan. Design: A descriptive correlation design using self-administered surveys. Methods: Questionnaires on stress, fatigue and sleep quality (the Pittsburgh Sleep Quality Index;PSQI-J) among shift work nurses were distributed to 653 nurses in Japan from January 2015 to February 2015. Results: Participants who reported higher levels of fatigue reported higher levels of stress (r = 0.774, p = 0.000), lower levels of sleep satisfaction (r = −0.411, p = 0.000) and overall lower levels of health (r = −0.323, p = 0.000).PSQI scores were also significantly correlated with reported levels of stress (r = 0.294, p = 0.000), fatigue (r = 0.291, p = 0.000) and levels of health (r = −0.370, p = 0.000). Nurses who have stress-relieving recourses were younger (t = −2.842, p = 0.005), reported higher levels of overall health (t = 2.727, p = 0.007), had higher levels of sleep quality measured by the PSQI (t = −2.560, p = 0.011), and required less time to fall asleep (t = −3.207, p = 0.001). Conclusions: This study showed an association between stress and sleep satisfaction among shift work nurses in Japan. In addition, nurses that engage in activities to manage stress might achieve higher levels of health and high sleep quality.

Shift Work: Impact on Nurses’ Health and Quality Life in Pointe-Noire (Congo)

Introduction: The consequences of shift work on health, psychological balance and socio-family life are multiple and universally known. Objective: The aim of this survey was to describe the impact of shift work on nurses’ health and quality life. Methodology: This was a cross-sectional descriptive study of the exposed and non-exposed type from May 2013 to July 2013, i.e. for a period of 3 months. We had included and divided into two groups the nurses working in the various departments of the Loandjili General Hospital (LGH). A questionnaire derived from the Pittsburgh Sleep Quality Index and the Epworth Sleepiness Scale had been used to collect the data. Results: Of the 91 nurses considered, including 59 in shift work (group I) and 32 in daytime work (group II), significant associations were found between shift work on the one hand and sleep problems on the other hand in all these aspects, stress and appetite disturbances. However, no significant association was found between shift work on the one hand and the use of sleeping pills on the other hand. Fatigue, mood disorders and the notion of free time (at home and for leisure), although the frequencies are relatively high in the group of nurses on shift work. Conclusion: Our results show that nurses’ health, social and family life at Loandjili General Hospital are negatively impacted by shift work. There is a need to put in place means of prevention.

Optimal Model and Solution of Railway Hub Shift Working Plan

Aiming at decreasing the hub transportation costs, a railway hub shift working plan in terms of multicommodity network flow model is set up for considering the coordination of freight working,train working and locomotive working plans.The solution and the calculating results are also introduced.

Unveiling the challenges encountered by newly graduated nurses during night shifts:A descriptive qualitative study

Objectives:Newly graduated nurses commence night shifts during a phase of heightened vulnerability to reality shock,exacerbating the challenges faced by these graduates.Therefore,this study aimed to identify the challenges experienced by newly graduated nurses when undertaking night shifts in order to help identify a strategy for supporting their adaptation to these shifts.Methods:Semi-structured personal interviews were used to collect data.Fifteen newly graduated nurses were selected to participate in the study by purposive sampling method from November 2021 to March 2022 in one of four general hospitals situated in the southwestern region of Japan.Semi-structured interviews were analyzed by using thematic analysis.Results:The analysis revealedfive central themes and nine subthemes:challenges in task efficiency(task organization challenges,challenges in time-constrained task performance),challenges in responding to patients’changing conditions(challenges in responding to patients’irregular conditions,challenges in responding to nighttime changes in patients’behaviors),challenges in independent practice(challenges in engaging in independent nursing practice,challenges in dealing with unexpected events),challenges in establishing collaborative relationships(challenges in working closely with other staff,challenges in establishing collaborative relationships during night shifts with limited resources),challenges in adapting to shift work(challenges in managing physical conditions for shift work).Conclusions:Newly graduated nurses often encounter challenges in performing their tasks during the transition period.When working night shifts,they face additional hurdles unique to nocturnal duties.Thefindings underscore the necessity for these graduates to develop night shift-specific readiness to effectively navigate the demands inherent in such work schedules.

基于Solid Works的外啮合直齿插齿刀参数化设计

介绍了一个基于SolidWorks API而开发的外啮合直齿插齿刀CAD软件。该软件能完成插齿刀齿形参数与结构参数的计算、三维实体造型及工程图的生成,并以实例验证了该软件的可行性。

Roll shifting strategy with varying stroke and step in hot strip mill

A new roll shifting strategy with varying stroke and varying step was investigated,Two characteristic parameters including cat ear height and gap contour smoothness were introduced to assess the effect of shifting strategy on roll wear,and the relation between characteristic parameters and shifting strategy was established.Both varying stroke and varying step can reduce cat ear height and gap contour smoothness,so the shifting strategy with varying stroke and varying step is better than the one with either varying stroke or varying step,Based on the effect of shifting control parameters on characteristic parameters of roll wear,the selection principle of these shifting control parameters was gained.A case study was conducted to validate the proposed roll shifting strategy,reducing uncontrollable quartic loading gap contour,improving strip profile and extending rolling length of a rolling campaign.

Relationship between work style and cigarette smoking in Japanese workers

day work and shift work) and cigarette smoking in Japanese workers. We used data of 3,238 men (39.3 ± 10.5 years) and 5,111 women (37.1 ± 10.9 years), aged 20 - 59 years, by cross-sectional clinical investigation study. Work style i.e. day work and shift work, cigarette smoking, status of stress and stress coping were obtained by questionnaires by well-trained medical staff. A total of 227 men (7.0%) and 339 women (6.6%) were shift workers, and 1346 men (41.6%) and 649 women (12.7%) were current smokers. Work style was significantly linked to cigarette smoking, stress and stress coping after adjusting for age in women. In addition, the level of stress coping in subjects with cigarette smoking was significantly lower than that in subjects without cigarette smoking even after adjusting for age in women. However, these associations were not noted in men. Work style was critically associated with cigarette smoking in Japanese female workers.

Effects of Prolonged Night Shifts on Salivary <i>α</i>-Amylase, Secretory Immunoglobulin, Cortisol, and Chromogranin A Levels in Nurses

Prolonged night shift is associated with high burnout rate, but the physiological effects of a 16 h shift remain undetermined. Here we evaluated fatigue and stress via salivary assays to determine the correlation between stress and fatigue and prolonged night shifts. Twenty-five nurses (9 men, 16 women;16 h night shift (n = 13), 8 h day shift (n = 12)) from Juntendo University Koshigaya Hospital were evaluated for four consecutive workdays separated by off days. Salivary samples were collected upon waking and before sleep on non-working days, before and after the day and night shifts, and before and after the break during the nocturnal schedule, and analyzed for levels of cortisol, chromogranin A, α-amylase activity and secretory immunoglobulin A (sIgA). On non-working days, cortisol levels showed similar kinetic pattern in both nurses. On working days, day-time nurses’ cortisol levels showed normal circadian pattern throughout the shift. Night nurses’ cortisol levels at the beginning of the shift were comparable to that of the normal morning elevation. α-Amylase activity in the night shift nurses was higher than day shift nurses through each period. No significant differences in chromogranin A and sIgA levels were detected between day and night shift workers. A 16 h night shift may cause marked circadian misalignment in cortisol levels.

China to Shift to Prudent Monetary Policy Next Year

China will shift its monetary policy stance from relatively loose to prudent next year,the Political Bureau of the Communist Party of China(CPC) Central Committee decided Friday. The meeting,chaired by President Hu Jintao,also

叠合式有机朗肯循环的热力学分析

针对有机朗肯循环(ORC)中传热过程对循环性能的影响,该文提出一种既相似但又区别于混合工质,各工质独立运行的叠合式有机朗肯循环(AORC)。AORC中,各工质进行串/并联的叠合换热,可形成类似于非共沸混合工质的温度滑移。由于各工质独立运行,使得叠合工质的温度滑移量可进行调节,以减小与外界热/冷源的传热温差,提高传热匹配性以及循环性能。以两种工质叠合的AORC为例进行循环性能分析,并与常规ORC进行对比。结果表明,AORC并不是各工质基本ORC的简单线性叠加,而是一种优化叠加。相比常规ORC,AORC的净输出功率最大可提升34.48%。但当热源温度高于高温工质的热源转折温度时,AORC趋近于高温工质的基本ORC。

双重移相控制下双有源桥变换器最小回流功率全局优化控制

双有源桥(dual-active-bridge,DAB)DC-DC变换器通常用于能量转换。然而,传统的单移相控制使得变换器在输入电压和输出电压不匹配时产生较大的回流功率,特别是轻载情况下该现象更为严重。现有基于双重移相控制(dualphase-shift,DPS)的回流功率优化策略,尚未考虑全功率范围内的回流功率,也缺乏对所有工作模式下最小回流功率的研究。为此,该文提出一种考虑全功率范围、全工作模式的DPS最优控制策略。首先,详细阐述回流功率产生的机理,建立了不同工作模式的传输功率和回流功率数学模型。然后,计及不同工作模式的功率限值,将DPS控制的传输功率分成不同的功率区。在此基础上,提出了一种基于最小回流功率的DPS最优控制策略,通过分析不同工作模式下的优化路径获得各个功率区的最优移相角,进而提升DAB变换器的传输效率。最后,搭建实验平台验证所提最小回流功率控制策略的可行性。

时型及社会时差对轮班护士体质量指数的影响

目的 探讨时型和社会时差对轮班护士体质量指数(body mass index, BMI)的影响,为护理管理者制订轮班护理人员BMI管理方案提供理论依据。方法 2023年7-8月,采用便利抽样法选取西南地区5所纬度相近的三级甲等综合性医院的429名轮班护士为研究对象。以轮班人员慕尼黑时型测定工具、晨晚型量表及BMI测定等对其调查。结果 不同年龄、性别、婚姻状况、时型和社会时差等的轮班护士,其BMI水平差异均有统计学意义(均P<0.05)。控制混杂因素后,时型和社会时差对轮班护士BMI影响的主效应及交互作用显著(F时型=51.16,P时型<0.01;F社会时差=68.02,P社会时差<0.01;F交互=51.48,P交互<0.01)。不同时型下,社会时差对轮班护士BMI水平的差异均有统计学意义(P<0.01)。高社会时差时,时型对轮班护士BMI水平的差异有统计学意义(P<0.01)。结论 时型和社会时差共同影响轮班护士BMI水平,建议考虑以两者交互关系为理论依据,针对轮班护士BMI水平管理采取干预,进而改善轮班护士代谢紊乱。

倒班护士的睡眠担忧现状及影响因素研究

目的调查倒班护士的睡眠担忧现状,并分析其影响因素,为制定针对性的干预措施提供参考。方法采用一般资料问卷、睡眠担忧量表、阿森斯失眠量表、自我调节疲劳量表和反刍思维量表对368名倒班护士进行调查。结果倒班护士睡眠担忧总分为40.00(33.00,44.75)分,担忧睡眠后果和不能控制睡眠2个维度评分分别为24.00(21.00,28.00)分、16.00(12.00,17.75)分。回归分析结果显示,健康状况、失眠、自我调节疲劳和反刍思维是倒班护士睡眠担忧的主要影响因素(均P<0.05)。结论倒班护士的睡眠担忧程度较严重,可以通过改善其失眠症状、降低自我调节疲劳程度和反刍思维水平来减轻倒班护士的睡眠担忧水平。

拉伸速率和转速位置对Nb47Ti合金拉伸测试的影响

利用万能试验机研究了拉伸速率和转速位置对Nb47Ti合金拉伸测试的影响,通过计算其真应力-应变曲线、加工硬化指数(n)和应变速率敏感系数(m)分析了Nb47Ti合金的力学行为。结果表明:Nb47Ti合金加工硬化能力十分有限,其屈强比接近1;随着拉伸速率的提高,加工硬化效果进一步减弱;拉伸速率对强度的影响较为显著,根据恒速率拉伸法计算其应变速率敏感系数为0.0263。转速试验中,随着拉伸速率的转换,应力值骤增。在加工硬化阶段的不同应变处转速时,突变幅值相对稳定,但整体随着应变量的增加而降低。本研究可为Nb47Ti合金拉伸测试时拉伸速率和转速点等参数的选取提供参考。

轮班对地铁职工健康相关生命质量的影响

目的探究轮班对地铁职工健康相关生命质量的影响,为提高该职业人群的健康素养提供科学依据。方法2019年对武汉市地铁集团职工进行研究,使用调查问卷收集人口学特征和职业史等信息。用生活质量评价量表(the Mos 36-item Short Form Health Survey,SF-36)测定其健康相关生命质量;按照性别分层,采用单因素和多因素Logistic回归模型分析轮班对该职业人群量表各维度得分的影响。结果9960名职工中有68.6%从事轮班工作。不同性别、工种、被动吸烟状况、锻炼习惯、睡眠状况、个人疾病史亚组人群的SF-36量表得分有显著差异(P<0.05)。与不轮班者相比,不同轮班制职工的一般健康状况、健康变化和社会功能等维度得分为差的风险均较高。并且随着轮班年限的增加,轮班者在身体机能、生理职能、一般健康状况、健康变化、精力、社会功能和精神健康维度得分为差的风险呈现为先升高再趋于平缓甚至下降的趋势。在男职工中,轮班制影响其SF-36量表各维度得分,但在女职工中未见此影响。结论轮班工作可能是影响地铁职工健康相关生命质量的重要危险因素之一,尤以男职工为甚。

护士自我调节疲劳现状及与医院磁性水平的关系研究

目的了解护士自我调节疲劳现状及感知医院磁性水平,探讨医院磁性水平对护士自我调节疲劳的影响,为制定干预措施提供参考。方法2023年5-8月,采用一般资料调查表、医院磁性要素量表、自我调节疲劳量表对西安市2所三级甲等医院的825名临床护士开展调查。结果护士自我调节疲劳总分(48.22±6.62)分,感知医院磁性水平总分(103.44±14.84)分。医院磁性水平与护士自我调节疲劳呈负相关;医院磁性水平、聘用类型、每月收入、夜班频次是护士自我调节疲劳的主要影响因素(均P<0.05),医院磁性水平可解释护士自我调节疲劳16.00%的总变异。结论护士自我调节疲劳及感知医院磁性水平均处于中等水平,医院磁性水平是护士自我调节疲劳的重要影响因素。管理者可以通过改善医院磁性水平以降低护士自我调节疲劳水平。

厚煤层大采高智能化综采工作面关键技术研究与应用

针对付村煤矿井下综采装备落后、开采成本高的问题,综合考虑生产安全、经济效益、资源回收等多方面因素,提出了在付村煤矿建立厚煤层大采高智能化工作面的构想。根据付村煤矿3上煤层赋存条件,基于智能化工作面设备集成控制平台,结合大采高液压支架智能化电控系统、大采高采煤机智能化控制系统及移动互联网云存储系统,重点突破了工作面主要设备姿态监测、大采高工作面智能化开采工艺、远程控制与集中监控等技术,实现了采煤机自主定位、记忆截割、液压支架自动跟机移架、全工作面一键顺序启停、故障自动顺序停机、三机协同控制,优化升级了矿井信息化系统,建立了智能化综采工作面互联网云平台。结果表明:自2017年11月在付村煤矿3上1008工作面进行工程应用以来,工作面生产班工作人员从12人减少为5人巡视检查,减员率达50%以上,日采煤达6000 t,技术应用效果显著,建立了枣矿集团6 m厚煤层智能化开采的生产模式,为厚煤层大采高智能化生产系统的发展提供示范与实践基础。