Table 3 Correlation matrix of the correlation coefficient (r) and probability (p).

From: Pain and mental-health scores significantly different in male and female football-players with traits of decision-reinvestment, but heart-rate-variability differences are unsupported

Correlation matrix

Physical-health

Mental health

SF-36 general health

SF-36 emotional capability

SF-36 well-being

SF-36 social function

SF-36 vitality

Personality traits

r

p

r

p

r

p

r

p

r

p

Decision-reinvestment

Ā Ā 

āˆ’Ā 0.25

0.021

āˆ’Ā 0.48

0.000

āˆ’Ā 0.36

0.001

āˆ’Ā 0.36

0.001

HRV

Heart rate (HR): Heart rate measured in beats per minute (bpm)

āˆ’Ā 0.33

0.002

āˆ’Ā 0.23

0.031

Ā Ā Ā Ā Ā Ā 

Inspiratory amplitude band (IAB): Represents heart rate variations during the inspiratory phase of breathing

āˆ’Ā 0.34

0.001

āˆ’Ā 0.24

0.023

Ā Ā Ā Ā Ā Ā 

Inspiratory amplitude range (IAR): Measures the range of heart rate variations during the inspiratory phase

āˆ’Ā 0.40

0.000

āˆ’Ā 0.29

0.006

Ā Ā Ā Ā Ā Ā 

Baevskā€™s stress index (SI): Index indicating stress levels based on HRV

āˆ’Ā 0.38

0.000

āˆ’Ā 0.27

0.010

Ā Ā Ā Ā Ā Ā 

B1 (%): Percentage of power in the very low-frequency range (VLF) indicating various regulatory mechanisms

0.37

0.000

0.25

0.021

Ā Ā Ā Ā Ā Ā 

B2 (%): Percentage of power in the low-frequency range (LF) associated with sympathetic and parasympathetic activity

0.21

0.049

Ā Ā Ā Ā Ā Ā Ā Ā 

Rā€“R intervals (RRNN): Duration between successive R peaks in milliseconds (ms)

0.33

0.002

0.23

0.029

Ā Ā Ā Ā Ā Ā 

Standard deviation of Rā€“R intervals (SDNN): Measures the overall variability of the heart rate in ms

0.33

0.002

0.24

0.026

Ā Ā Ā Ā Ā Ā 

CV (coefficient of variation): Represents the ratio of the standard deviation to the mean of RR intervals, (%)*

0.21

0.050

Ā Ā Ā Ā Ā Ā Ā Ā 

Root mean square of successive differences (RMSSD): Reflects short-term HRV in ms

0.33

0.002

0.28

0.008

Ā Ā Ā Ā Ā Ā 

Mean number of times in which the change of Rā€“R intervals Exceeds 50 ms (NN50)

0.30

0.004

0.26

0.015

Ā Ā Ā Ā Ā Ā 

Mean percentage of times the change of Rā€“R intervals exceeds 50 ms (pNN50): %

0.32

0.002

0.27

0.010

Ā Ā Ā Ā Ā Ā 

High-frequency power (HF): Power in the frequency range of 0.15 to 0.4Ā Hz (msĀ²)

0.30

0.004

0.27

0.012

Ā Ā Ā Ā Ā Ā 

Low-frequency power (LF): Power in the frequency range of 0.04 to 0.15Ā Hz (msĀ²)

0.23

0.029

Ā Ā Ā Ā Ā Ā Ā Ā 

Very low-frequency power (VLF): Power in the frequency range of 0.0033 to 0.04Ā Hz (msĀ²)

0.29

0.006

Ā Ā 

0.25

0.019

0.23

0.034

Ā Ā 

Total frequency power (TP): Total power in the frequency domain (ms2ā€‰Ć—ā€‰1000)

0.33

0.002

0.25

0.020

Ā Ā Ā Ā Ā Ā 

Mode (Mo): Most frequent Rā€“R interval in ms

0.32

0.003

0.25

0.017

Ā Ā Ā Ā Ā Ā 

Percentage of mode amplitude (AMo): %

āˆ’Ā 0.34

0.001

āˆ’Ā 0.24

0.022

Ā Ā Ā Ā Ā Ā 

Ventricular response (VR): Represents the heartā€™s response to different stimuli, used in arrhythmia detection

0.32

0.002

0.22

0.038

Ā Ā Ā Ā Ā Ā 

HRV index: A composite index summarizing various HRV parameters and indicating overall heart-rate-variability (ms)

0.34

0.001

0.25

0.020

Ā Ā Ā Ā Ā Ā 

Standard deviation Perpendicular to the Line of Identity (SD1): ms

0.33

0.002

0.28

0.008

Ā Ā Ā Ā Ā Ā 

Standard deviation Along the Line of Identity (SD2): ms

0.33

0.002

0.24

0.027

Ā Ā Ā Ā Ā Ā 

Mean of zero crossings (m0Z): Represents the mean number of zero crossings in the RR interval signal

0.22

0.041

Ā Ā Ā Ā Ā Ā Ā Ā 

Cognitive function

Perseveration errors WCST

Ā Ā Ā Ā Ā Ā Ā Ā 

0.27

0.013

Exercise

Strength training/week (h)

Ā Ā Ā Ā Ā Ā Ā Ā 

0.24

0.025

Endurance training/week (h)

Ā Ā 

0.32

0.002

Ā Ā Ā Ā Ā Ā 
  1. *Indicating the relative dispersion of heartbeats.
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