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However, no research has yet identified microinterval combinations that maintain acute responses entirely within the\u00a0low-intensity zone below LT<jats:sub>1<\/jats:sub>, accounting for oscillations caused by pulsating power output. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Thirteen endurance athletes cycled for\u00a0four 45-minute exercises: continuous low-intensity exercise (CON; power: 88% LT<jats:sub>1<\/jats:sub>) and 3 microinterval exercises alternating 111% power associated to maximum rate of VO<jats:sub>2<\/jats:sub> and \u223c60\u00a0W, with cycles of 4\u20136, 7\u201323, and 10\u201320\u00a0s. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Compared with CON, heart rate and VO<jats:sub>2<\/jats:sub> did not exceed LT<jats:sub>1<\/jats:sub> more during microintervals (<jats:italic>P<\/jats:italic>\u2009\u2265\u2009.26, effect size\u2009\u2264\u20090.44), and rating of perceived exertion was greater only during 10\u201320\u00a0s (3.1 [0.8] vs 2.4 [0.7], <jats:italic>P<\/jats:italic>\u2009=\u2009.01). Blood lactate and mean respiratory exchange ratio did not differ between exercises (analysis of variance <jats:italic>P<\/jats:italic>\u2009\u2265\u2009.36). All mean responses of 4\u201326 and 7\u201323 were equivalent to CON (<jats:italic>P<\/jats:italic>\u2009\u2264\u2009.02). Oscillation of the examined variables during microintervals was largely greater than CON only for heart rate (&gt;100% greater; <jats:italic>P<\/jats:italic>\u2009\u2264\u2009.001, effect size\u2009\u2265\u20091.7), while oscillation of VO<jats:sub>2<\/jats:sub> was at most 25% greater (<jats:italic>P<\/jats:italic>\u2009\u2265\u2009.02, effect size\u2009\u2264\u20090.70). <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> Microintervals could be classified as oscillating low-intensity exercises as they fulfill the traditional low-intensity criteria\u2014responses of almost all internal variables did not exceed those of CON, not even fat oxidation. Microinterval exercises form a unique exercise class in which high-intensity muscular work blends with mild metabolic perturbation.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0397","type":"journal-article","created":{"date-parts":[[2025,7,7]],"date-time":"2025-07-07T14:46:48Z","timestamp":1751899608000},"page":"1206-1214","source":"Crossref","is-referenced-by-count":2,"title":["Substituting Low-Intensity Endurance Exercise With High-Intensity Microintervals: Responses to Acute Exercise"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0241-8406","authenticated-orcid":true,"given":"Pekka","family":"Matom\u00e4ki","sequence":"first","affiliation":[{"name":"Faculty of Sport and Health Sciences, University of Jyv\u00e4skyl\u00e4, Jyvaskyla, Finland"},{"name":"Paavo Nurmi Center & Unit for Health and Physical Activity, University of Turku, Turku, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mimmi","family":"Iivari","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, University of Jyv\u00e4skyl\u00e4, Jyvaskyla, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4819-0619","authenticated-orcid":true,"given":"Olli-Pekka","family":"Nuuttila","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, University of Jyv\u00e4skyl\u00e4, Jyvaskyla, Finland"},{"name":"UKK Institute for Health Promotion Research, Tampere, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0006-2045-2815","authenticated-orcid":true,"given":"Timi","family":"Malinen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences, University of Jyv\u00e4skyl\u00e4, Jyvaskyla, Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"100","reference":[{"issue":"13","key":"r1","series-title":"Sportscience","first-page":"32","article-title":"Intervals, thresholds, and long slow distance: the role of intensity and duration in endurance training","volume":"13","author":"Seiler S","year":"2009","unstructured":"Seiler S, T\u00f8nnessen E. 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