Key result
HRV symbolic dynamics demonstrate ~0.99 inter-day reliability and detect autonomic modulations during sympathetic stimulation.
Why the study?
Most studies on heart rate variability in professional athletes have focused on linear indices, leaving a lack of studies evaluating non-linear parameters in this group.
Does sympathetic nervous system activity stimulation alter short-term symbolic dynamics measures of heart rate variability in elite modern pentathletes?
Observational (n=8)
No
Does sympathetic nervous system activity stimulation alter short-term symbolic dynamics measures of heart rate variability in elite modern pentathletes?
Effect estimate: ICC 0.99 (95% CI 0.96-1.00)
Symbolic dynamics indices of heart rate variability are reliable and sensitive to sympathetic stimulation in elite athletes, offering a potential monitoring tool independent of respiratory rate.
Supports reliability of symbolic dynamics HRV indices in athletes; hypothesis-generating and should not yet change practice.
Background and Purpose: Most studies on heart rate variability (HRV) in professional athletes concerned linear, time-, and frequency-domain indices, and there is lack of studies on non-linear parameters in this group. The study aimed to determine the inter-day reliability, and group-related and individual changes of short-term symbolic dynamics (SymDyn) measures during sympathetic nervous system activity (SNSa) stimulation among elite modern pentathletes. Methods: , and the Equal-probability methods) were analyzed. Relative and absolute reliability were evaluated. Results: methods significantly decreased and increased, respectively, during SNSa stimulation-such changes were noted for all athletes. There was no significant association between differences in SymDyn parameters and respiratory rate in stable conditions and while comparing stable conditions and SNSa stimulation. Conclusion: SymDyn indices may be used as reliable non-respiratory-associated parameters in laboratory settings to detect autonomic nervous system (ANS) activity modulations in elite endurance athletes. These findings provide a potential solution for addressing the confounding influence of respiration frequency on HRV-derived inferences of cardiac autonomic function. For this reason, SymDyn may prove to be preferable for field-based monitoring where measurements are unsupervised.
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Gąsior et al. (2022) conducted an observational in Healthy (Elite modern pentathlon athletes) (n=8). Sympathetic nervous system activity (SNSa) stimulation via isometric handgrip strength test vs. Stable measurement conditions (baseline) was evaluated on Inter-day reliability (ICC) of 2UV using Max-min method (ICC 0.99, 95% CI 0.96-1.00). Symbolic dynamics indices of heart rate variability demonstrated acceptable inter-day reliability (ICC 0.91-0.99) and detected autonomic nervous system modulations during sympathetic stimulation.
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