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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