{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,5,23]],"date-time":"2025-05-23T04:34:46Z","timestamp":1747974886422,"version":"3.41.0"},"reference-count":13,"publisher":"Human Kinetics","issue":"6","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":[],"published-print":{"date-parts":[[2025,6,1]]},"abstract":"<jats:p><jats:italic><jats:bold>Background<\/jats:bold>:<\/jats:italic> Critical power and critical\u00a0speed (CS) are key markers in exercise physiology for distinguishing between heavy- and severe-intensity domains and are useful for training prescription and performance prediction. Durability, defined as the rate and extent of physiological decline during prolonged exercise, has become a focus in endurance sports. This study aimed to investigate whether an hour of heavy-intensity running induces a decline in CS and other performance parameters using GPS-based assessments. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Seven trained runners completed a set of 3-minute all-out tests to measure CS and its reliability. On a subsequent visit, they ran for 1\u00a0hour at 85% of their CS while wearing a portable GPS device. After the run, they performed another 3-minute all-out test to assess CS under fatigue. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> The average speed during the fatiguing run was 3.6 (0.4)\u00a0m\u00b7s<jats:sup>\u22121<\/jats:sup>, representing 78% of CS and 86% of maximal heart rate. CS and D\u2032 significantly declined by 6% (4%) and 68% (26%), respectively (<jats:italic>P<\/jats:italic>\u2009=\u2009.0039 and <jats:italic>P<\/jats:italic>\u2009=\u2009.0033). Total running distance, maximal speed, and time to reach maximal speed were also significantly reduced. <jats:italic><jats:bold>Conclusion:<\/jats:bold><\/jats:italic> These findings demonstrate that 1\u00a0hour of heavy-intensity running impairs CS and other performance metrics in amateur runners, highlighting the importance of developing durability in endurance exercise.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0430","type":"journal-article","created":{"date-parts":[[2025,3,26]],"date-time":"2025-03-26T02:33:08Z","timestamp":1742956388000},"page":"866-868","source":"Crossref","is-referenced-by-count":0,"title":["Using the 3-Minute All-Out Test to Explore the Durability of the Speed\u2013Duration Relationship in Endurance Running"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0307-182X","authenticated-orcid":true,"given":"Jaume","family":"Lloria-Varella","sequence":"first","affiliation":[{"name":"Laboratoire Interuniversitaire de Biologie de la Motricit\u00e9, Universit\u00e9 Jean Monnet Saint-\u00c9tienne, Lyon 1, Universit\u00e9 Savoie Mont-Blanc, Saint-Etienne, France"},{"name":"Laboratoire Interdisciplinaire Performance Sant\u00e9 Environnement de Montagne (LIPSEM), Faculty of Sports Sciences, University of Perpignan Via Domitia, Font-Romeu, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5042-4384","authenticated-orcid":true,"given":"Thierry","family":"Busso","sequence":"additional","affiliation":[{"name":"Laboratoire Interuniversitaire de Biologie de la Motricit\u00e9, Universit\u00e9 Jean Monnet Saint-\u00c9tienne, Lyon 1, Universit\u00e9 Savoie Mont-Blanc, Saint-Etienne, France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8965-9861","authenticated-orcid":true,"given":"Frederic","family":"Sabater-Pastor","sequence":"additional","affiliation":[{"name":"Laboratoire Interuniversitaire de Biologie de la Motricit\u00e9, Universit\u00e9 Jean Monnet Saint-\u00c9tienne, Lyon 1, Universit\u00e9 Savoie Mont-Blanc, Saint-Etienne, France"},{"name":"Laboratoire Interdisciplinaire Performance Sant\u00e9 Environnement de Montagne (LIPSEM), Faculty of Sports Sciences, University of Perpignan Via Domitia, Font-Romeu, France"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"3","key":"r1","series-title":"J Appl Physiol","doi-asserted-by":"publisher","first-page":"446","DOI":"10.1152\/japplphysiol.00942.2016","article-title":"Muscle metabolic and neuromuscular determinants of fatigue during cycling in different exercise intensity domains","volume":"122","author":"Black MI","year":"2017","unstructured":"Black MI, Jones AM, Blackwell JR, et\u00a0al. 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