Maximum Aerobic Capacity of Underground Coal Miners in India

Abstract

Miners fitness test was assessed in terms of determination of maximum aerobic capacity by an indirect method following a standard step test protocol before going down to mine by taking into consideration of heart rates (Telemetric recording) and oxygen consumption of the subjects (Oxylog-II) during exercise at different working rates. Maximal heart rate was derived as 220−age. Coal miners reported a maximum aerobic capacity within a range of 35–38.3 mL/kg/min. It also revealed that oldest miners (50–59 yrs) had a lowest maximal oxygen uptake (34.2 ± 3.38 mL/kg/min) compared to (42.4 ± 2.03 mL/kg/min) compared to (42.4 ± 2.03 mL/kg/min) the youngest group (20–29 yrs). It was found to be negatively correlated with age (r = −0.55 and −0.33 for younger and older groups respectively) and directly associated with the body weight of the subjects (r = 0.57 – 0.68, P ≤ 0.001). Carriers showed maximum cardio respiratory capacity compared to other miners. Indian miners VO2max was found to be lower both compared to their abroad mining counterparts and various other non-mining occupational working groups in India.

Health status and physical fitness of mines rescue brigadesmen

“…Rather lower values of VO 2 max detected by the indirect method in the Indian miners (42.4±2.03 ml/kg for the age group 20-29 and 34.2±3.38 ml/kg for the group 50-59 years), have been reported by Saha et al [35]. Comparable values of VO 2 max /kg were indicated using linear extrapolation of sub-maximal values in a large population of American men and women aged 18-59 by Lewis et al [17].…”