Population
4 world-champion rowers
Design
Case_series
Authors
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Ln rMSSD may underestimate parasympathetic activity in athletes; leaves open optimal multi-index HRV monitoring pending larger studies.
A combination of HRV indices, including Ln rMSSD and the Ln rMSSD:R-R ratio, should be used to accurately monitor cardiac autonomic activity in elite athletes due to the phenomenon of parasympathetic saturation.
Plews et al. (2016) studied this question.