ArticleEuropean journal of applied physiology2025
Fractal correlation properties of heart rate variability and respiratory frequency as measures of endurance exercise durability.
Article in European journal of applied physiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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Who cites it
4 citing papers in PubMed.
- Recovery of Linear and Nonlinear Heart Rate Variability Metrics After Short-Term Moderate versus Vigorous Intensity Exercise: A Cross-Sectional Randomized Cross-Over Study.European journal of sport science · 2025Trial
- Kinetics of submaximal DFA α1 prior and post maximal efforts in trained and highly trained male and female cyclists.European journal of applied physiology · 2026Article
- Time-variability of muscle oxygen saturation during graded maximal exercise.European journal of applied physiology · 2026Article
- Taking heart rate variability to the next level in sports: towards a multi-signal integration.Frontiers in sports and active living · 2026Article
Corrections and comments
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Authors and funding
5 authors.
Funding
Abstract
purposeField-based measures of durability (exercise-related physiologic deterioration over time) for assessing athletic fitness often rely on changes in maximal power profiles or heart rate (HR) drift. This study aimed to determine whether an index of HR variability based on the short-term exponent of Detrended Fluctuation Analysis (DFA a1) along with respiratory frequency (fB) could demonstrate changes in durability during a Time to Task Failure (TTF) Trial.
methodsTen participants performed a cycling TTF at an intensity of 95% of the respiratory compensation point (RCP) on two occasions, Control and a "Reward" where a monetary incentive was offered when task failure was signaled. Metabolic responses including oxygen uptake (
resultsThe elapsed time of TTF sessions was statistically similar (p = 0.54). After initial equilibration, metabolic responses remained largely stable over Q2-Q4. HR, DFA a1 and fB displayed drift over Q2-Q4 with significant ANOVA. Repeatability of quarterly HR, DFA a1, and fB between Control and Reward sessions was high with ICC between 0.73 and 0.94, Pearson's r was between 0.83 and 0.98 with no difference in mean values by paired t testing.
conclusionHR, fB and DFA a1 are useful metrics representing alteration in physiologic characteristics demonstrating durability loss during an endurance exercise session. These measures were repeatable across sessions and have the potential to be monitored retrospectively or in real time in the field with low-cost consumer equipment.
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