International Journal of Occupational Hygiene 2017. 9(4):.

EstimatingAerobic Capacity (VO2-max) using a Single-stage Step Test and Determining its Effective Factors
Sattar Hosseini, Mohammad Reza Ghotbi Ravandi, narges khanjani

Abstract


Background and objectives: Maximal Aerobic Capacity (VO2-max) is an indicator for the preparedness of the cardiovascular and respiratory systems and a tool to estimate the physiological fitness of individuals for their work. This study aimed to measure the VO2-max and Physical Work Capacity (PWC) of workers at a metal industry and the factors affecting it using a single-stage step test.
Materials and Methods: This cross-sectional study was conducted on 60 workers in a metal industry in Tehran. Data collection tools was a questionnaire including separate sections asking about demographic and anthropometric (height, weight and BMI) characteristics. Quantitative variables were recorded after being measured. The Tuxworth and Shahnawaz method and step test were used in order to estimate VO2-max and PWC. Data were analyzed using SPSS 22.
Findings: The relative humidity of the place was 40% and local air pressure was 879 atmospheres. The average VO2-maxand average maximum PWC of the study population were 3.13±0.283L/min and 15.65±1.41 kcal/min, respectively. There was a significant relationship between VO2-maxusing single-stage step test and BMI (P=0.01), number of hours of exercise per week (P=0.009) and age (P=0.01).
Conclusion: The step test is a rapid, easy and low-cost method to estimate physiological adaptation and PWC of individuals. Variables such asage, hours of exercise per week and BMI are effective on aerobic capacity.

Keywords


VO2-max, physical work capacity, step test

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