title: Study of the relationship between the aerobic capacity (VO2 max) and the rating of perceived exertion based on the measurement of heart beat in the metal industries Esfahan.
abstract: OBJECTIVE
  To establish a balance between work (physical exercise) and human beings, the aerobic capacity (VO2 max) could be used as a measure. Additionally, the subjective and physiological assessment could be applied as one of the methods for assessing physical exercise. The most commonly used tools for the assessment of fatigue during physical exercise include the Borg scale Rating of perceived Exertion (RPE) in relation to subjective symptoms and heart rate (HR) in relation to physiological symptoms. The study is aimed to investigate the relationship between the aerobic capacity and the RPE based on the measurement of heat rate (HR) of workers from the Metal Industries of Isfahan.
  
  
  METHODS
  The subjects were 200 male workers from metal components manufacturers in Isfahan selected by using random sampling based on statistic method. The subjects were examined by using ergometer in accordance with A strand 6 minutes cycle test protocol. Furthermore, the subjects were asked to rate their status based on the Borg rating scale at the end of each minute. Additionally, their heat rates were monitored and recorded automatically at the end of each minutes.
  
  
  RESULTS
  Statistical analysis showed that there was a significant relationship between the RPE and the aerobic capacity (VO2 max) (r = -0.904, P < 0.05). The results illustrated that there was a stronger correlation between HR and VO2 max (r = 0.991, P < 0.001). The regression analysis of the quadratic equation also indicated that there was also a significant relationship between the VO2 max and HR.
  
  
  CONCLUSIONS
  The results indicated that there was a strong relationship between the RPE and VO2 max, as well as a greater correlation between HR and VO2 max. Therefore, the HR could be used as a Prediction measure to estimate VO2 max.
authors: Department of Occupational Health Engineering, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Ehsanollah
authors: E
authors: Habibi
authors: Department of Occupational Health Engineering, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Habibollah
authors: H
authors: Dehghan
authors: Department of Occupational Health Engineering, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Mohammad
authors: M
authors: Moghiseh
authors: Department of Epidemiology and Biostatistics, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Akbar
authors: A
authors: Hasanzadeh
keywords: Heart rate; VO2 max; metal industries; rating of perceived exertion