The Effect Of Work Shift On Subjective Fatigue At Pt. Sumber Setia Budi Kolaka Sultra Workers

PT. Sumber Setia Budi is a company engaged in the nickel mining industry as a contractor partner for the central company PT. Antam Tbk UBPN Sultra is located in Kolaka district, Pomalaa sub-district. The purpose of this study was to determine the effect of work shifts on subjective fatigue in the Mechanic Workshop section using a Cross-Sectional approach with multiple linear regression analysis, the sample amounted to 21 respondents. The instrument used is a Subjective Self Rating Test (SSRT) questionnaire and the types of data are primary and secondary data. The results of the analysis using multiple linear regression with the f test simultaneously show that the significant value and calculated F value between groups of the morning (X1), afternoon (X2), and night (X3) shift simultaneously on subjective fatigue (Y) is F count 2,571 > F table 3.13 and a significant value of 0.229 > 0.05, so it can be concluded that there is an effect between the morning shift (X1), afternoon shift (X2) and night shift (X3) on subjective fatigue but the effect is not significant. To reduce and overcome fatigue experienced by workers, the company should further improve the comfort and facilities of the work environment to create a more comfortable and ergonomic work environment.


INTRODUCTION
Work fatigue is a subjective feeling accompanied by a decrease in efficiency and the need for work. Every workplace and type of work can cause work fatigue in workers, this can lead to decreased performance and increased work errors, thus providing opportunities for work accidents in the industry [1]. Work fatigue is one of the health and safety problems that can be a risk factor for accidents at work, one of the causes of work fatigue is work shifts that are not by applicable regulations [2]. PT. Sumber Setia Budi (SSB) is a company engaged in the nickel mining industry as a contractor partner for the central company PT. Antam Tbk UBPN Sultra which is located in Kolaka district, Pomalaa sub-district, this company has been established in 1989[3] [4]. In the implementation of work in this company, to increase productivity is to increase working hours by implementing shift work. Shift work as a pattern of working time, namely working for 24 hours continuously which is applied by the company and will have a major impact on the workforce and subjective complaints. In the process of work at PT. Sumber Setia Budi in the Workshop section Mechanic, namely as a place of maintenance, repair, and manufacture for the productivity of the company's performance as a partner in the nickel mining area of PT. Antam Tbk. The working hours in this company are 8 working hours. For shift 1 from 06.00 -14.00. For shift 2 hours 14.00 -22.00. For shift 3 from 22.00 -06.00. The workforce in this company works eight hours a day without a break with an overtime calculation of one hour per day and this company does not yet have specific regulations regarding the determination of work shift rotation. Based on interviews that researchers conducted with several employees on the night shift, they complained of headaches, felt tired, and said they often yawned while working and felt sleepy, this may be due to monotonous activities at work and the effects of the work environment that occur in every work shift schedule[5][6]. employee. Calculation of the level of fatigue in a company is very important to provide information to the company as a reference in making policies for better HR management to minimize the occurrence of work fatigue which can affect company productivity and reduce the risk of work accidents[7] [8].

RESEARCH METHODS 2.1 Time and Place of Research.
The study was carried out on 27 November 2021 at PT. Sumber Setiaia Budi (SSB), Pomalaa District, Kolaka Regency. Southeast Sulawesi Province 2.2 Data Collection.

Primary Data
The primary data in this study are worker profile data and the results of subjective fatigue questionnaire scores experienced by workers after working on certain shifts.

Secondary Data
The secondary data in this study is the Standard Scale of the Subjective Self Rating Test Method 2.3 Data Processing. The data processing used in this study uses the multiple linear regression analysis methods which is used to determine whether there is an influence of the independent variable on the dependent variable, the data processing uses the SPPSS program, following the stages of data processing: 1. Validity Test A validity test is used to measure the validity or validity of a questionnaire. A questionnaire is said to be valid if the questions on the questionnaire are to reveal something that will be measured by the questionnaire [9].
2. Reliability Test The reliability test is useful for determining whether the instrument, in this case, the questionnaire, can be used more than once, at least by the same respondent, and will produce consistent data.
3. F test (simultaneous/combined test) The F test is used to determine the effect of the independent variables simultaneously (simultaneously) on the dependent variable.

T-test (Partial Test)
The t-test is used to determine whether the independent variables partially have a significant effect or not on the dependent variable

Validity Test
From the results of the questionnaire validity test, the r count is greater than the r table, which is 0.433 with a significance of 5%, so all questions can be used as many as 30 items. These data indicate that the correlation between each indicator to the overall variables shows significant results.

Reliability Test
From the table, it can be seen that the Cronbach alpha value for all questionnaires is greater than

f test (simultaneous)
From the test results above, it is known that the significance value and calculated F value between groups of morning (X1), afternoon (X2) and evening (X3) work shifts simultaneously on subjective fatigue (Y) is F count 2.571 > F table 3.13 and significant value 0.229 > 0.05, so it can be concluded that there is an effect between the morning shift (X1), afternoon shift (X2) and night shift (X3) on subjective fatigue but the effect is not significant

t test (partial)
From the test results above, it is known that the significance value and the calculated t value between the work shift groups are partially X1, X2, X3 on subjective fatigue, namely: a. The first hypothesis (H1), it is known that the significance value for the effect of the morning shift (X1) on subjective fatigue (Y) is 0.588 > 0.05 and the t value is 0.605 < t