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Médecine du travail du personnel hospitalier

Job strain and heart rate variability in resident physicians within a general hospital

Auteur     Sendy Isarel Hernández-Gaytan
Auteur     Stephen J Rothenberg
Auteur     Paul Landsbergis
Auteur     Leonor Cedillo Becerril
Auteur     Guillermo De León-León
Auteur     Sean M Collins
Auteur     Francisco Javier Díaz-Vásquez
Résumé     OBJECTIVE: To evaluate the association of heart rate variability with job strain in first year resident physicians. METHODS: 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. RESULTS: 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. CONCLUSIONS: 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. © 2012 Wiley Periodicals, Inc.
Publication     American journal of industrial medicine
Date     Aug 6, 2012

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