The study adopted qualitative research design to examine Occupational Health and Safety Management System (OHSMS) implementation and organizational performance of Food/ Beverage and Building/Construction industries in Cross River State, Nigeria. Three companies from each category and 25 workers from each company totaling 150 research subjects were selected for the study. Three research questions and three null hypotheses were formulated to guide the study, while the internationally accepted OHSAS 18001 and ISO 45001 checklists, directed the preparation of a validated questionnaire which was used for data collection. Mean, standard deviation and Analysis of Variance were used for data analysis. Results showed significantly high and positive influence of OHSMS implementation on the performance of Food/ Beverage and Building/Construction industries in Cross River State. This stresses the strategic importance/need of OHSMS as a yard stick for organization and operation of every industry.  Comparatively however, a more significant influence of OHSMS implementation was recorded in Food/Beverage, indicating a difference in implementation level. Furthermore, each of all the OHSMS elements significantly influenced study industries, except for auditing, indicating that all the essential elements of OHSMS are important at every point of OHSMS implementation. However, more attention should be paid to auditing, in order to achieve a more reliable and successful implementation. In addition, OHSMS, with a consideration for local environment, was highly recommended for its application in all study industries, to bring about optimal performance in the areas of management influence and employee participation.

The impact of mental wellness on the work performance and wellbeing of workers has generated much academic and corporate debates. Most recently, due to some high-profile cases involving the performance and wellness of sports people, conversations around the impact of mental wellness on work performance have dominated public discourse, yet the nature and degree of this impact has not been sufficiently studied and analysed and many questions remain unanswered. Indeed, there has been a growing awareness of the centrality of the role of mental wellness in the productivity of workers, especially in the Oil and Gas industry. Thus, this research sought to investigate how rotational work, its impact on sleep and endurance, affect workers in the Oil and Gas industry, using as methodology a simple random sampling of workers from the Port Harcourt metropolis, in the oil-rich delta area of Nigeria. To obtain data, this research used questionnaires, telephone interviews and cohort discussion session. Questions posed during this research focused on sleep and its perceived effect on endurance. The questionnaires were administered to the workers from selected international Oil and Gas companies located in Port Harcourt. Findings revealed that both sleep and the circadian cycle were negatively affected and impacting the self-reported well-being and productivity of the workers. From the data collected, 27.5% and 66.2%, which represented a total of 93.7% of the respondents, agreed and strongly agreed that their sleep was affected. 100% of the participants in the cohort session agreed that their sleep was affected. Furthermore, the interview sessions revealed specific details as more than 50% of the interview respondents indicated that the sleep distortion affected them even up to the first week of their time off. 48.8% and 37.5% agreed and strongly agreed to the fact that rotational work had effect on their endurance on site. This represented a total of 86.2% of the participants whose endurance level was affected due to rotational work. Over 60% of the participants in the cohort session admitted to feeling of extreme tiredness towards the end of their rotation period and prior to departure from site. The participants unanimously submitted that shorter rotation would give room for adequate recuperation and make work more productive and enhance the sense of mental wellness for rotational Oil and Gas workers.

The impact of rotational work system on the mood and energy level among Oil and Gas workers was evaluated. The design was set in Port Harcourt metropolis Nigeria and questionnaire, cohort session and interviews were the instruments deployed. Questionnaires were administered to randomly selected workers from international Oil and Gas Companies located in Port Harcourt, Questions that bothered on the effect of rotational work on the mood and energy level of Oil and Gas workers were posed. It was observed that 38.8% and 41.2% agree and strongly agree that their mood is affected on site while 13.8% remained neutral. Interestingly, over 80% of Oil and Gas workers agreed to feeling of anxiety from the interview and cohort sessions. 40% and 43.8% of workers agree and strongly agree respectively that rotational work does affect their energy on site. Obtained median of 4 means that over 50% of the response belongs to the category that agree strongly agree while a mode of 5 has more responses in the category of strongly agree which is in agreement with results from the percentage frequency. Rotational workers were affected by absence from family and loved ones, social isolation and constant reminder of hazard and working in hazardous environment with work pressures and unrealistic deadlines. These cause depression and general dissatisfaction with life. Results from interviews revealed neglect of mental wellness of workers. The Oil and Gas workers are willing to face these hazards because of the economic gains arising from their work, however provision of recreational amenities and making policies that bring the Oil and Gas workers back home every seven days forbidding the schedule of trainings and workshops during time off duty will make rotational work more bearable.