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The aim was to explore DFA\u2010a1 dynamics across the moderate, heavy, and severe intensity domains and assess its utility for both monitoring and prescribing exercise intensity. Sixteen untrained adults (3 women) performed an incremental cycling stage test and three constant\u2010load sessions (moderate, heavy, and severe). Gas exchange kinetics, blood lactate concentration, and heart rate (HR) were measured. Ventilatory (VTs), lactate, and HR variability (HRV) thresholds were determined and used to define training zones. A two\u2010factor repeated\u2010measures ANOVA and the Friedman test assessed intensity\u2010 and method\u2010related effects. Significant intensity\u00a0\u00d7\u00a0time interactions were observed for all variables (\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0&lt;\u00a00.001). DFA\u2010a1 remained stable without crossing the first HRV threshold throughout moderate exercise, while in the heavy and severe domains, it showed a drift over time, mirroring the behaviour of traditional markers. In the moderate session, DFA\u2010a1\u2010based prescription maintained &gt;\u00a094% session time and 87%\u2013100% of participants within the desired zone, outperforming HR methods based on VTs (71% time, 50%\u201381% participants;\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0&lt;\u00a00.05). In the heavy and severe domains, corresponding values were &gt;\u00a023% and &gt;\u00a050%, whereas gas exchange or lactate prescriptions exceeded 44% and 65%, respectively (\n                    <jats:italic>p<\/jats:italic>\n                    \u00a0&lt;\u00a00.01). DFA\u2010a1 appears to be a suitable tool for monitoring internal load, especially in moderate intensity exercise. It offers a non\u2010invasive, integrative measure sensitive to both intensity and duration, providing a valuable complementary perspective on systemic regulation.\n                  <\/jats:p>","DOI":"10.1002\/ejsc.70271","type":"journal-article","created":{"date-parts":[[2026,10,16]],"date-time":"2026-10-16T14:25:07Z","timestamp":1792160707000},"source":"Crossref","is-referenced-by-count":0,"title":["Correlation Properties of Heart Rate Variability for Exercise Intensity Monitoring and Prescription During Constant\u2010Load Cycling: A Comparison With Traditional Physiological Variables"],"prefix":"10.1002","volume":"26","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1271-7194","authenticated-orcid":false,"given":"Noem\u00ed","family":"Sempere\u2010Ruiz","sequence":"first","affiliation":[{"name":"Sports Research Centre Universidad Miguel Hern\u00e1ndez  Elche Spain"},{"name":"Institute for Health and Biomedical Research of Alicante (ISABIAL)  Alicante 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