Produção Nacional
Revisado por pares
12-hour Period Of Firefighting Is Associated With Short But Intense Periods Of Cardiac Strain
2017; Lippincott Williams & Wilkins; Volume: 49; Issue: 5S Linguagem: Inglês
10.1249/01.mss.0000518766.25400.f1
ISSN1530-0315
AutoresRosenkranz Maciel Nogueira, Edgard M. K. V. K. Soares, Eugênio C. Nogueira, Carlos Janssen Gomes da Cruz, Guilherme Eckhardt Molina, Keila Elizabeth Fontana, Maria Korre, Denise Smith, Stefanos N. Kales, Luiz Fernando Junqueira, Luiz Guilherme Grossi Porto,
Tópico(s)Occupational Health and Burnout
ResumoFirefighters’ work routines vary worldwide, but generally include fire suppression, rescues and medical emergencies. These job activities may expose firefighters (FF) to an elevated cardiac strain. PURPOSE: We evaluated the heart rate (HR) and blood pressure (BP) profile during a routine 12-hour work period among career FF. METHODS: 30 male military FF, aged 40±3.2 yrs, BMI = 26.3±3.1 kg/m2, were recruited from a Brazilian Fire Department. BP and HR were measured in a basal condition on an off-duty day (Eva1) and before (Eva2) and after (Eva3) a 12-hour period of work, in resting supine (SUP) and orthostatic (ORT) postures. HR was also continuously measured during work period by the Polar_V800 and on-duty cardiac strain was categorized by the absolute and relative time spent on 4 intensity zones: light (<63% Max_age_predicted_HR), moderate (63-76%), hard (77-93%) and very hard (≥ 94%). HR and BP were compared between the 3 evaluations (Friedman test), at 5% level of significance. RESULTS: 97.3±4.2% of on-duty time was spent on light and 1.8±2.8% on moderate intensities. An important absolute time was performed on hard (4.7±10.0 min) and very hard (0.7±2.8min) intensities. 46.7% of FF engaged on hard and 16.7% on very hard intense activities. Mean on-duty peak_HR was equivalent to 76.8±17.1% of Max_HR and achieved 107.1±10.7% among those who performed very hard activities. HR and BP comparisons in the 3 evaluations are shown on Table. CONCLUSION: Our data show a significant increase in resting HR after 12-hour on-duty, suggesting a change on resting cardiovascular regulation toward a more stressful condition. The majority of FF was exposed to high cardiac strain during a routine 12-hour shift work. Although the time spent on vigorous activities was short, its intensity might represent an acute elevated risk for fatal and non-fatal cardiovascular event in susceptible firefighters.Table: No title available.
Referência(s)