Correlation matrix of heart rate variability parameters
Variables
MRR
SDNN
RMSSD
pNN50
LF
HF
LF/HFNormlog
MRR
1.00
0.41
0.51
0.56
–0.43
0.43
–0.46
SDNN
0.41
1.00
0.96
0.78
–0.55
0.55
–0.55
RMSSD
0.51
0.96
1.00
0.87
–0.67
0.67
–0.68
pNN50
0.56
0.78
0.87
1.00
–0.73
0.71
–0.73
LF
–0.43
–0.55
–0.67
–0.73
1.00
–0.99
0.99
HF
0.43
0.55
0.67
0.71
–0.99
1.00
–0.98
LF/HFNormlog
–0.46
–0.55
–0.68
–0.73
0.99
–0.98
1.00
Values are Pearson’s correlation. Strong positive correlations and strong negative correlations (above 0.8) are shown in dark black. MRR is the mean of the normal sinus (NN) intervals; SDNN is the standard deviation (SD) of all NN intervals; RMSSD is the root mean square of the successive differences between adjacent NN intervals; pNN50 is the percentage of times that the change in consecutive NN sinus intervals exceeded 50 ms; LF is low frequency; HF is high frequency, and LF/HFNormlog is normalized LF/HF by logarithmic transformation
Declarations
Author contributions
WM: Conceptualization, Writing—original draft, Validation, Supervision, Writing—review & editing. SAMM and THLB: Formal analysis, Investigation, Methodology. CAMdOF: Formal analysis, Investigation. All authors reviewed and approved the final version of the manuscript before submission.
Conflicts of interest
The authors declare that they have no conflicts of interest.
Ethical approval
The study protocol was ethically approved by the Human Research Ethics Committee of the Federal University of Amapá (CAAE: 50150121.1.0000.0003, n° 5.121.013) and complied with the Declaration of Helsinki.
Consent to participate
Informed consent was obtained from the athletes.
Consent to publication
Not applicable.
Availability of data and materials
Due to the privacy of the athletes’ data, we cannot provide the original dataset.
Funding
This research was funded by the Amapá Research Support Foundation (FAPEAP) through its public call 003/2018, specifically within the “Research Program for the Unified Health System (SUS): Management in Health-PPSUS”. The funder had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.
Open Exploration maintains a neutral stance on jurisdictional claims in published institutional affiliations and maps. All opinions expressed in this article are the personal views of the author(s) and do not represent the stance of the editorial team or the publisher.
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