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Open Access Highly Accessed Research article

Weight- perception in male career firefighters and its association with cardiovascular risk factors

Dorothee M Baur12, Costas A Christophi13, Antonios J Tsismenakis124, Sara A Jahnke5 and Stefanos N Kales126*

Author affiliations

1 Department of Environmental Health, Environmental and Occupational Medicine and Epidemiology (EOME), Harvard School of Public Health, Boston, MA, USA

2 The Cambridge Health Alliance, Harvard Medical School, Employee Health and Industrial Medicine, Cambridge, MA, USA

3 Cyprus International Institute for Environmental and Public Health in association with Harvard School of Public Health, Cyprus University of Technology, Limassol, Cyprus

4 Boston University School of Medicine, Boston, MA, 02118, USA

5 The Institute for Biobehavioral Health Research, National Development and Research Institutes, Leawood, KS, USA

6 The Cambridge Health Alliance, 1493 Cambridge Street. Macht 427, Cambridge, MA, 02139, USA

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Citation and License

BMC Public Health 2012, 12:480  doi:10.1186/1471-2458-12-480

Published: 25 June 2012

Abstract

Background

The prevalence of obesity has reached epidemic proportions worldwide, and is also increasing among public safety professionals like firefighters who are expected to be fit and more active. The present study evaluates the associations among Body Mass Index (BMI), weight perception and cardiovascular risk factors in 768 male career firefighters from two Midwestern states in the United States.

Methods

A physical examination was performed and fasting blood samples were taken. Cardio-respiratory fitness (CRF) was determined from symptom- limited maximal treadmill exercise testing with electrocardiogram (ECG) monitoring and estimation of oxygen consumption (metabolic equivalents, METS) using the Bruce protocol. A health and lifestyle questionnaire was administered with standardized written instructions for completion. Self-reports of weight perception were extracted from responses to the completed multiple choice questionnaire. Baseline characteristics were described using the mean (standard deviation) for continuous variables and frequency for categorical variables. Group comparisons were calculated using analysis of variance (ANOVA). Linear models and logistic regression models were used to adjust for possible confounders. Logistic regression analyses were used to calculate the odds ratios of underestimating one’s weight category.

Results

A high proportion of overweight and obese male career firefighters underestimate their weight categories (68%). The risk of underestimating one’s weight category increased by 24% with each additional unit of increasing BMI after adjustment for age and CRF. When divided into six groups based on combinations of measured BMI category and weight perception, there were significant differences among the groups for most cardiovascular risk factors. After adjustment for age and BMI, these differences remained statistically significant for CRF, amount of weekly exercise, prevalence of Metabolic Syndrome (MetSyn), body fat percentage and cholesterol measurements.

Conclusion

A high proportion of overweight and obese male career firefighters underestimate their measured BMI categories. As a result, they are unlikely to fully appreciate the negative health consequences of their excess weight. The results of this study emphasize the importance of objectively measuring BMI and then informing patients of their actual weight status and the associated disease risks.

Keywords:
Weight perception; Cardio-respiratory fitness; Firefighters; Obesity; Cardiovascular-risk factors