Table 2 Correlation between cardiac autonomic modulation and different domains of physical activity.

From: Relationship between domains of physical activity and cardiac autonomic modulation in adults: a cross-sectional study

HRV indexes

Occupational PA

Sport PA

Leisure time/commuting PA

Total PA

r

p-value

r

p-value

r

p-value

r

p-value

SDNN (ms)

− 0.03

0.619

0.19

0.002

0.16

0.010

0.14

0.026

RMSSD (ms)

− 0.01

0.975

0.21

0.001

0.18

0.005

0.18

0.005

LF (nu)

0.09

0.148

− 0.11

0.094

− 0.08

0.186

− 0.03

0.627

HF (nu)

− 0.06

0.346

0.10

0.137

0.07

0.272

0.04

0.545

SD1

− 0.01

0.927

0.20

0.002

0.16

0.011

0.16

0.011

SD2

− 0.04

0.572

0.17

0.007

0.14

0.025

0.12

0.058

  1. HRV Heart rate variability, SDNN Standard deviation of the mean of all normal RR intervals, RMSSD Square root of the square mean of the differences between adjacent normal RR intervals in a time interval, LF Low frequency, HF High frequency, SD1 Standard deviation of instantaneous beat-to-beat variability, SD2 Long-term standard deviation of continuous R–R intervals, PA Physical activity, ms milliseconds, nu normalized units.
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