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Relationship between overtime work hours and cardio-ankle vascular index (CAVI): a cross-sectional study in Japan
Koichi Hata1, Toru Nakagawa, Masayuki Hasegawa
1Department of Work Systems and Health, Institute of Industrial Ecological Science, University of Occupational and Environmental Health.
Insights
Excessive overtime work may increase arterial stiffness in older workers. Specifically, working over 100 hours monthly significantly elevates the risk of high CAVI (arterial stiffness index) in men in their 50s.
Area of Science:
- Cardiovascular Health
- Occupational Health
- Biomedical Engineering
Background:
- Arterial stiffness is a predictor of cardiovascular events.
- The Cardio-Ankle Vascular Index (CAVI) is a novel indicator of arterial stiffness.
- Understanding occupational factors influencing arterial stiffness is crucial for public health.
Purpose of the Study:
- To investigate the association between monthly overtime work hours and arterial stiffness, measured by CAVI.
- To determine if prolonged overtime impacts cardiovascular health indicators in Japanese male workers.
Main Methods:
- A cross-sectional study involving 3,862 Japanese male workers aged 26-59.
- CAVI was measured, and monthly overtime hours were self-reported into five categories.
- Odds ratios for CAVI ≥9.0 were calculated based on overtime work duration.
Main Results:
- No significant association between overall overtime and CAVI was found in the full sample.
- Workers aged 50s working ≥100 overtime hours/month showed a significantly higher odds ratio for CAVI ≥9.0 (OR=4.26).
- The risk of elevated CAVI increased with higher overtime categories, particularly for older workers.
Conclusions:
- Working excessive overtime (≥100 hours/month) is linked to increased arterial stiffness in male workers in their 50s.
- Age appears to be a critical factor in the relationship between overtime and arterial stiffness.
- This suggests targeted interventions for older workers with high overtime demands.
Objectives:
The purpose of this research was to evaluate the relationship between overtime work hours and CAVI, a new index of arterial stiffness.
Methods:
We measured CAVI of Japanese workers (3,862 men) aged 26 to 59 years. Simultaneously, we obtained information on their monthly overtime work hours for the past few months using a self-administered questionnaire, with responses divided into five groups: <45, ≥45 and <60, ≥60 and <80, ≥80 and <100 and ≥100 hours/month. We calculated the odds ratios of CAVI≥9.0 for each group of overtime work hours.
Results:
In the full sample, there was no significant association between the average CAVI and overtime work hours. Taking<45 overtime hours/month as the reference category, the odds ratios of CAVI≥9.0 were as follows: OR=1.11, 95% CI=0.73-1.69 (≥45 and <60 hours/month); OR=0.92, 95% CI=0.48-1.76 (≥60 and <80 hours/month); OR=1.50, 95% CI=0.50-4.49 (≥80 and <100 hours/month); and OR=2.65, 95% CI=0.82-8.54 (≥100 hours/month). However, for workers in their 50 s, the odds ratio of CAVI≥9.0 was significantly higher among subjects with≥100 hours/month than among those with<45 hours/month (OR=4.26, 95% CI=1.2-15.1) CONCLUSIONS: The present study suggests that CAVI is more likely to be 9.0 or higher in workers in their 50 s when they work≥100 hours of overtime per month.
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