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Cardiac frequency in miners recorded during four to five work shifts

  • L. Palenciano
  • V. Gonzalez
  • L. A. Santullano
  • B. Rodriguez
  • M. A. Montoliu
Original Article

Abstract

Cardiac frequency (fc) was recorded in 101 coal-face miners [mean age 32.7 (range 21–49) years, mean height 169.6 (range 150–185) cm, mean body mass 76.9 (range 54–106) kg, mean maximal cardiac frequency (fcmax) 180.2 (range 154–197) beats min−1, mean maximal oxygen uptake\((\dot VO_{2max} )\) 2.93 (range 1.9–4.0) l · min−1] with a small-size, nonintrusivefc counter, during the five (n = 76) or at least four (n = 25) work-shifts in a week. Thefcmax and\(\dot VO_{2max} \) were determined during a progressive test to exhaustion on a treadmill. Overall (four to five work-shifts) mean work-timefc (fc) was 97.7 (range 74.9–122.4) beats · min−1, restingfc (fc rest) 59.1 (range 50–75) beats · min−1, work-time increase infc (fcfc rest) 38.5 (range 21.1–55.8) beats · min−1 and percentage offc reserve used (fc reserve =fc maxfcrest)32.0(range 18.5–50.9). Multiple regression analysis showed thatfc andfcfc rest, as dependent variables, correlated with predicted percentage of CO lung diffusion capacity, (DLCOSB%) (r = −0.334 andr = −0.273, respectively) but not with age,fc max,\(\dot VO_{2max} \),\(\dot VO_{2max} \) · kg−1 body mass, effort test Δoxygen uptake/Δfc or percentage of forced expiratory volume in 1 s as independent variables. The percentage offc reserve used as dependent variable, correlated withDLCOSB (r = − 0.265) andfc max (r = − 0.227) but not with any of the other variables listed. Individual differences in worktimefc are thus large and virtually unpredictable. Other physiological variables not taken in account here (i.e. sense of effort, fatigue perception) as well as psychological ones (work satisfaction, motivation) may have played a role in those differences. At peaks of effort, some subjects reachedfc values within the range offc max.

Key words

Work heart rate Work capacity Work schedule tolerance Mining work 

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Copyright information

© Springer-Verlag 1996

Authors and Affiliations

  • L. Palenciano
    • 1
  • V. Gonzalez
    • 1
  • L. A. Santullano
    • 2
  • B. Rodriguez
    • 1
  • M. A. Montoliu
    • 1
  1. 1.Instituto Nacional de SilicosisFisiologia Respiratoria (Unidad de Ergonomia)OviedoSpain
  2. 2.Departamento TecnicoInstituto Nacional de SilicosisOviedoSpain

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