Disclosure Statement: The authors report no conflicts of interests.
Job strain and heart rate variability in resident physicians within a general hospital†
Version of Record online: 6 AUG 2012
Copyright © 2012 Wiley Periodicals, Inc.
American Journal of Industrial Medicine
Special Issue: Research Contributions from the United States International Training and Research in Environmental and Occupational Health Program: Part 2
Volume 56, Issue 1, pages 38–48, January 2013
How to Cite
Hernández-Gaytan, S. I., Rothenberg, S. J., Landsbergis, P., Becerril, L. C., De León-León, G., Collins, S. M. and Díaz-Vásquez, F. J. (2013), Job strain and heart rate variability in resident physicians within a general hospital. Am. J. Ind. Med., 56: 38–48. doi: 10.1002/ajim.22098
- Issue online: 20 DEC 2012
- Version of Record online: 6 AUG 2012
- Manuscript Accepted: 28 JUN 2012
- Irving J. Selikoff International Scholar of the Mount Sinai School of Medicine. Grant Number: D43TW000640
- job strain;
- heart rate variability;
- demand–control model
To evaluate the association of heart rate variability with job strain in first year resident physicians.
We performed the study at the “Manuel Gea González” General Hospital in Mexico City. 54 resident doctors were studied over a period of 24 hr in their first year of specialization. Two questionnaires were administered: the first on general demographics, and the second, the Job Content Questionnaire. Heart rate variability was evaluated through the frequency domain (low-frequency power, high-frequency power, and low-frequency power/high-frequency power ratio) and time domain (SDNN). The doctors wore a Holter monitor over a 24-hr period, which included a workday plus their on-call time. They recorded their activities in a log.
Compared to physicians in the “low strain” category, physicians working in the “passive” category had lower overall peak-to-peak cardiac variability (standard deviation of N–N intervals, SDNN), −9.08% (95% CI −17.97, 0.74), a −25% (95% CI −45.00, 0.22) lower high-frequency power, and −26.95% (95% CI −39.00, −12.53) lower low-frequency power. Physicians working in the “high strain” category had lower low-frequency power, −17.85% (95%CI −32.34, −0.25), and lower low-frequency/high-frequency ratio −24.29% (95% CI 38.08, 7.42) compared to those in the “low strain” category.
High job strain and low job control among medical residents were associated with several indicators of lowered heart rate variability. Thus, analysis of heart rate variability may be an informative marker for evaluating the physiological impacts of workplace stressors. Am. J. Ind. Med. 56:38–48, 2013. © 2012 Wiley Periodicals, Inc.