KSOEM
Articles
- Page Path
- HOME > Ann Occup Environ Med > Volume 16(1); 2004 > Article
- Original Article Effects of Physical Workload on Salivary Cortisol Level
- Dong Mug Kang, Byung Min Son, Sang Baek Koh, Junho Jang, Mia Son, Jongwon Kim, Byung Mann Cho, Su Ill Lee
-
DOI: https://doi.org/10.35371/kjoem.2004.16.1.57
Published online: March 31, 2004
1Department of Preventive and Occupational Medicine, College of Medicine, Pusan National University, Korea. kangdm@pusan.ac.kr 
2Department of Obstetrics & Gynecology, Boram Hospital, Korea.
3Department of Occupational Medicine, Daewoo Hospital, Korea.
4Department of Preventive Medicine, College of Medicine, Kangwon National University, Korea.
5Department of Occupational & Environmental Medicine, Pusan Paik Hospita, Korea.
2Department of Obstetrics & Gynecology, Boram Hospital, Korea.
3Department of Occupational Medicine, Daewoo Hospital, Korea.
4Department of Preventive Medicine, College of Medicine, Kangwon National University, Korea.
5Department of Occupational & Environmental Medicine, Pusan Paik Hospita, Korea.
- 39 Views
- 0 Download
- 3 Crossref
- 0 Scopus
Abstract
OBJECTIVE: Workload is known to affect the hypothalamus-pituitary-adrenal axis. Although many studies had revealed that job stress related factors could affect the neuroendocrine system among blue-collar workers, these studies had limitations as they had not evaluated the workload by objective methods which took into consideration individual physiological differences. This study was conducted to evaluate the effects of physical workload adjusted job stress on cortisol regulation by using objective tools for workers having various job tasks.
METHODS
Among 110 foundry workers, shipyard workers, and fine machine assemblers for whom saliva samples were obtained, 102 without any past history of conditions that could affect hormonal regulation such as diabetes, and hypertension were included in this study. Among the 102 study participants, 15 workers whose saliva for morning or afternoon or heart rate monitoring data was not attained were excluded from the final analysis. Workload was evaluated by RHR (relative heart rate) using a heart rate monitor, and job stress was evaluated by Karasek's Job Content Questionnaire. Saliva samples were gathered during 8 - 9 am and 5 - 6 pm, and salivary cortisol levels were analysed by radioimmunoassay.
RESULTS
After adjusting several variables which could effect cortisol secretion including job stress, among the higher RHR group morning salivary cortisol level was increased (beta=60.32, S.E.=26.35, p=0.0266), afternoon salivary cortisol level was decreased (beta=-7.43, S.E.=29.73, p=0.8044), and salivary cortisol level difference between morning and afternoon was increased (beta=72.10, SE=35.50, p=0.0509).
CONCLUSIONS
As physical workload increases morning cortisol level, which is caused by the effect of arousal, and decreases afternoon cortisol level, which is caused by exhaustion, physical workload enlarges the width of diurnal cortisol variance. Therefore, physical exhaustion due to excessive workload could have adverse effects on the neuroendocrine system.
Cite
