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Table 4 HRV measurements of a subgroup on non-welding days (n = 49)

From: Heart rate variability and DNA methylation levels are altered after short-term metal fume exposure among occupational welders: a repeated-measures panel study

 

Mean (SD)

Difference in Measurement

p-valuea

Pre-shift

Post-shift

Post-shift – Pre-shift

SDNN (msec)

45.4 (23.5)

45.5 (23.1)

1.9

0.32

rMSSD (msec)

26.5 (18.5)

26.4 (189.3)

0.69

0.65

pNN10 (%)

51.97 (22.0)

50.1 (22.9)

-0.56

0.75

pNN20 (%)

34.1 (23.2)

32.1 (23.8)

-0.65

0.7

LF (msec2)

850.3 (976.1)

853.4 (888.2)

60

0.43

HF (msec2)

427.6 (804.5)

407.4 (719.2)

3.23

0.97

  1. aAccounting for within subject correlation.
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BMC Public Health

ISSN: 1471-2458

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