ArticleSports (Basel, Switzerland)2026
Investigating the Acute Effect of Different Training Protocols on Heart Rate Variability.
Article in Sports (Basel, Switzerland), 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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3 authors.
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Abstract
This study examined the acute effects of high-intensity interval training (HIIT) and prolonged endurance training (ET) on heart rate variability (HRV) in elite Greco-Roman wrestlers and assessed the usefulness of HRV for monitoring post-exercise recovery. Using a longitudinal, within-subject, repeated-measures design, 13 elite male wrestlers completed two training protocols-differing in intensity, duration, modality, and work-rest structure-in a fixed, non-randomized order (ET on Day 7, HIIT on Day 22), separated by a 15-day washout period. HRV was recorded at baseline, pre-exercise, during training, and 24 h post-exercise, and analyzed with a linear mixed model and Bonferroni-adjusted post hoc comparisons. A significant main effect of Timepoint was found for all HRV parameters (SDNN, RMSSD, LF/HF ratio, and the lnRMSSD-derived HRV Score), reflecting marked reductions during exercise and partial recovery by 24 h (e.g., SDNN decreased by approximately 73% in ET and 82% in HIIT). SDNN also differed significantly between training types overall, but heart rate did not differ between protocols during exercise (
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