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[Docs] Revise definition of pNN50 and pNN20 #1013

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[Docs] Revise definition of pNN50 and pNN20 #1013

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13 changes: 9 additions & 4 deletions neurokit2/hrv/hrv_time.py
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Original file line number Diff line number Diff line change
Expand Up @@ -74,10 +74,10 @@ def hrv_time(peaks, sampling_rate=1000, show=False, **kwargs):
Frequency (LF/HF) Ratio (Sollers et al., 2007).
* **Prc20NN**: The 20th percentile of the RR intervals (Han, 2017; Hovsepian, 2015).
* **Prc80NN**: The 80th percentile of the RR intervals (Han, 2017; Hovsepian, 2015).
* **pNN50**: The proportion of RR intervals greater than 50ms, out of the total number of
RR intervals.
* **pNN20**: The proportion of RR intervals greater than 20ms, out of the total number of
RR intervals.
* **pNN50**: The percentage of absolute differences in successive RR intervals greater than
50 ms (Bigger et al., 1988; Mietus et al., 2002).
* **pNN20**: The percentage of absolute differences in successive RR intervals greater than
20 ms (Mietus et al., 2002).
* **MinNN**: The minimum of the RR intervals (Parent, 2019; Subramaniam, 2022).
* **MaxNN**: The maximum of the RR intervals (Parent, 2019; Subramaniam, 2022).
* **TINN**: A geometrical parameter of the HRV, or more specifically, the baseline width of
Expand Down Expand Up @@ -111,6 +111,9 @@ def hrv_time(peaks, sampling_rate=1000, show=False, **kwargs):

References
----------
* Bigger Jr, J. T., Kleiger, R. E., Fleiss, J. L., Rolnitzky, L. M., Steinman, R. C., & Miller,
J. P. (1988). Components of heart rate variability measured during healing of acute myocardial
infarction. The American journal of cardiology, 61(4), 208-215.
* Pham, T., Lau, Z. J., Chen, S. H. A., & Makowski, D. (2021). Heart Rate Variability in
Psychology: A Review of HRV Indices and an Analysis Tutorial. Sensors, 21(12), 3998.
https://doi.org/10.3390/s21123998
Expand All @@ -123,6 +126,8 @@ def hrv_time(peaks, sampling_rate=1000, show=False, **kwargs):
towards a gold standard for continuous stress assessment in the mobile environment. In
Proceedings of the 2015 ACM international joint conference on pervasive and ubiquitous
computing (pp. 493-504).
* Mietus, J. E., Peng, C. K., Henry, I., Goldsmith, R. L., & Goldberger, A. L. (2002). The pNNx
files: re-examining a widely used heart rate variability measure. Heart, 88(4), 378-380.
* Parent, M., Tiwari, A., Albuquerque, I., Gagnon, J. F., Lafond, D., Tremblay, S., & Falk, T.
H. (2019). A multimodal approach to improve the robustness of physiological stress prediction
during physical activity. In 2019 IEEE International Conference on Systems, Man and
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