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Table 3 Mean values of heart rate variability by job stress

From: Factors related to heart rate variability among firefighters

      Unit; Mean (S.D.)
  Time domain Frequency domain
Variables SDNN RMSSD LF(ln) HF(ln) LF/HF ratio
Physical environment      
  Low 37.47 (13.42) 28.91 (15.18) 5.55 (0.90) 5.05 (1.02) 2.53 (3.10)
  High 38.62 (15.65) 29.75 (16.13) 5.60 (1.01) 5.06 (1.16) 2.74 (3.59)
Job demand      
  Low 38.61 (14.73) 30.96 (16.41)* 5.59 (0.99) 5.13 (1.11) 2.39 (2.83)
  High 37.64 (14.59) 28.04 (14.97) 5.58 (0.95) 5.00 (1.08) 2.85 (3.75)
Insufficient job control      
  Low 38.40 (15.82) 29.79 (17.59) 5.59 (0.97) 5.09 (1.12) 2.49 (2.59)
  High 37.84 (13.70) 29.02 (14.08) 5.57 (0.96) 5.03 (1.08) 2.77 (3.87)
Interpersonal conflict      
  Low 37.92 (14.27) 27.86 (13.66) 5.62 (0.95) 4.97 (1.10) 3.04 (3.21)
  High 38.09 (14.69) 29.46 (15.83) 5.58 (0.97) 5.06 (1.10) 2.62 (3.38)
Job insecurity      
  Low 38.85 (14.78) 30.21 (16.81) 5.68 (0.94)* 5.10 (1.09) 2.85 (3.57)
  High 37.39 (14.53) 28.59 (14.60) 5.49 (0.98) 5.02 (1.10) 2.46 (3.18)
Organizational system      
  Low 38.84 (14.81) 30.52 (16.92) 5.61 (0.90) 5.17 (1.04)* 2.43 (3.00)
  High 37.56 (14.54) 28.56 (14.76) 5.56 (1.01) 4.98 (1.13) 2.79 (3.60)
Lack of reward      
  Low 39.40 (15.75) 31.26 (17.61)* 5.60 (0.94) 5.19 (1.08)* 2.21 (2.15)*
  High 37.45 (14.08) 28.45 (14.62) 5.57 (0.98) 5.00 (1.10) 2.85 (3.80)
Occupational climate      
  Low 39.54 (15.25)* 31.28 (17.50)* 5.69 (0.93) 5.18 (1.07)* 2.55 (3.13)
  High 36.87 (14.05) 27.76 (13.84) 5.49 (0.98) 4.96 (1.11) 2.72 (3.57)
Total      
  Low 38.51 (15.06) 30.41 (17.28) 5.60 (0.96) 5.12 (1.10) 2.54 (3.14)
  High 37.65 (14.24) 28.30 (13.89) 5.56 (0.97) 5.00 (1.09) 2.75 (3.59)
  1. * : p < 0.05