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While previous research showed how it is affected by neuromuscular fatigue and ageing, the underlying mechanisms remain unclear. It is currently under debate whether these changes are explained by central or peripheral neuromuscular mechanisms. Here, we experimentally manipulated the sleep of thirteen young adults through a supervised 24\u00a0h-sleep deprivation protocol. This study aimed to investigate the effect of sleep deprivation on the regularity of torque fluctuations, and other standard torque-related outcomes (Peak Torque \u2013 PT \u2013 and Rate of Torque Development \u2013 RTD). The participants were asked to perform knee extension maximal voluntary contractions (MVC) and submaximal knee extensions at 40% of MVC for 30\u00a0s. PT and RTD were calculated from the MVC and the regularity of the torque fluctuations was determined on the submaximal task through Sample Entropy (SampEn). In addition, rate of perceived effort (RPE) was collected. We found no significant changes in PT and RTD. The regularity of torque fluctuations significantly increased (i.e., a decrease in SampEn) after 24\u00a0h-sleep deprivation (PRE\u2009=\u20091.76\u2009\u00b1\u20090.268, POS24\u2009=\u20091.71\u2009\u00b1\u20090.306; <jats:italic>p<\/jats:italic>\u2009=\u20090.044). Importantly, we found a negative correlation between RPE and SampEn relative changes after sleep deprivation. This study brings new insights towards the understanding of the underlying mechanisms that explain changes in torque fluctuations, demonstrating that these changes are not limited to neuromuscular processes but are also likely to be affected by other domains, such as psychological profile, which can indirectly affect the neural drive to the muscles.<\/jats:p>","DOI":"10.1007\/s00221-024-06810-1","type":"journal-article","created":{"date-parts":[[2024,3,7]],"date-time":"2024-03-07T17:48:45Z","timestamp":1709833725000},"page":"1037-1046","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Sleep deprivation increases the regularity of isometric torque fluctuations"],"prefix":"10.1007","volume":"242","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-3244-4664","authenticated-orcid":false,"given":"Jo\u00e3o H.","family":"Oliveira","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2074-722X","authenticated-orcid":false,"given":"Paulo","family":"Santos","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6154-5563","authenticated-orcid":false,"given":"Pedro","family":"Pezarat-Correia","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9691-5456","authenticated-orcid":false,"given":"Jo\u00e3o R.","family":"Vaz","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,3,7]]},"reference":[{"issue":"6","key":"6810_CR1","doi-asserted-by":"publisher","first-page":"473","DOI":"10.1080\/09291016.2010.537444","volume":"42","author":"LG Araujo","year":"2011","unstructured":"Araujo LG, Waterhouse J, Edwards B, Santos HER, Tufik S, Tlio De Mello M (2011) Twenty-four-hour rhythms of muscle strength with a consideration of some methodological problems. 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