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This study aimed at investigating whether prolonged low-intensity exercise induces shifts in the lactate threshold, and whether fatigue-induced changes differ between the sexes.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>A total of 31 (15 females) recreational runners performed an incremental treadmill test and a 90-min low-intensity exercise (LIT90) on two separate occasions. The LIT90 was performed at 90% of the first lactate threshold speed (LT1v), derived from the incremental treadmill test. The LT1v was determined from a 5-stage (3\u00a0min) submaximal threshold test (SubmaxLT), performed before and after LIT90. The SubmaxLTs were followed by a 10\/5 reactivity jump test. Respiratory gases, heart rate (HR), and HR-derived detrended fluctuation analysis alpha 1 (DFA-a1) were assessed every 15\u00a0min during the LIT90.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      A significant decrease (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.01) was observed in the LT1v in females (\u2212\u00a05.8\u2009\u00b1\u20094.4%) and in males (\u2212\u00a05.3\u2009\u00b1\u20096.4%). The HR increased (\n                      <jats:italic>p<\/jats:italic>\n                      \u2009&lt;\u20090.001) similarly in females (5.9\u2009\u00b1\u20093.1%) and in males (5.5\u2009\u00b1\u20093.6%) during the LIT90, while energy expenditure increased (3.1\u2009\u00b1\u20094.5%,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.013) in females but remained unchanged in males (0.9\u2009\u00b1\u20093.1%). Change in DFA-a1 during the LIT90 was the only marker that correlated significantly with the relative change of LT1v (\n                      <jats:italic>r<\/jats:italic>\n                      \u2009=\u20090.463,\n                      <jats:italic>p<\/jats:italic>\n                      \u2009=\u20090.013).\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>LIT90 induced significant decreases in the LT1v, and the changes were comparable between sexes. DFA-a1 could be a potential intra-session marker of durability.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.1007\/s00421-024-05631-y","type":"journal-article","created":{"date-parts":[[2024,10,9]],"date-time":"2024-10-09T14:01:56Z","timestamp":1728482516000},"page":"697-705","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Durability in recreational runners: effects of 90-min low-intensity exercise on the running speed at the lactate threshold"],"prefix":"10.1007","volume":"125","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4819-0619","authenticated-orcid":false,"given":"Olli-Pekka","family":"Nuuttila","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vesa","family":"Laatikainen-Raussi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Krista","family":"Vohlakari","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Iida","family":"Laatikainen-Raussi","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Johanna K.","family":"Ihalainen","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,10,9]]},"reference":[{"key":"5631_CR1","doi-asserted-by":"publisher","first-page":"865","DOI":"10.2165\/00007256-200535100-00004","volume":"35","author":"CR Abbiss","year":"2005","unstructured":"Abbiss CR, Laursen PB (2005) Models to explain fatigue during prolonged endurance cycling. 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