J Nutr Health.  2016 Oct;49(5):367-377. 10.4163/jnh.2016.49.5.367.

Relationships between job stress and caffeine intake in industrial workers

Affiliations
  • 1Department of Food and Nutrition, Chonnam National University, Gwangju 61186, Korea.
  • 2Department of Food and Nutrition, Chosun University, Gwangju 61452, Korea. leejj80@chosun.ac.kr

Abstract

PURPOSE
This study analyzed the degree of job stress and caffeine intake in workers in industrial positions in order to determine the relationships between job stress and caffeine intake.
METHODS
For this purpose, this study conducted a survey targeting 361 blue collar workers working for K manufacturing company, Gwangju.
RESULTS
The total score for job stress in subjects was 72.7 ± 6.8 points/100 points. According to job stress, subjects were categorized as follows: Q1 for the group who had the least stress; Q2 for the group who had little stress; Q3 for the group who had a lot of stress, and Q4 for the group who had the most stress. As for the effects of caffeine on health, 57.1% thought that caffeine is helpful and not harmful if taken properly while 17.3% responded that less caffeine consumption is better. Daily intake of caffeine according to stress was presented as: 172.0 ± 85.3 mg in Q1, 179.0 ± 83.7 mg in Q2, 187.9 ± 81.4 mg in Q3, and 214.2 ± 147.3 mg in Q4 (p < 0.05). The percentages of caffeine consumption compared to the daily safe limit in subjects were: 43.0 ± 21.3, 44.8 ± 20.9, 47.1 ± 20.4, and 53.6 ± 36.8% in Q1, Q2, Q3, and Q4, respectively (p < 0.05). Adverse effects such as nausea or vomiting from caffeine were most common in Q4 (p < 0.05)
CONCLUSION
As a result, higher stress in blue collar workers working for K manufacturing company was associated with more caffeine consumption. Groups with a lot of stress (Q4) consumed approximately 50% of daily safe limit of caffeine. Considering the results above, this study suggests that further research on more precise caffeine intake and its effects is needed.

Keyword

caffeine intake; degree of job stress; male blue collar workers

MeSH Terms

Caffeine*
Gwangju
Nausea
Vomiting
Caffeine

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