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This study aimed to examine the effects of local alternating heat and cold stimulation, using a wearable thermal device, on the hemodynamics of fatigued muscle tissue and autonomic nervous activity.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Twenty healthy individuals experienced fatigue in the periarticular muscles of the shoulder joint due to a typing task. Local alternating heat and cold stimulations were then applied to the upper trapezius muscle. Muscle hardness was measured using a muscle hardness meter, and muscle tissue hemodynamics and oxygenation were evaluated using near-infrared spectroscopy before and after the stimulation. Autonomic nervous activity was also evaluated using heart rate variability.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>Alternating heat and cold stimulation decreased muscle hardness of the fatigued trapezius muscle from 1.38\u2009\u00b1\u20090.15 to 1.31\u2009\u00b1\u20090.14 N (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01). The concentration of total hemoglobin in the trapezius muscle tissue increased from\u2009\u2212\u20090.21\u2009\u00b1\u20091.36 to 2.29\u2009\u00b1\u20093.42\u00a0\u00b5mol\/l (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01), and the tissue hemoglobin oxygen saturation also increased from 70.1\u2009\u00b1\u20095.4 to 71.1\u2009\u00b1\u20096.0% (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05). Additionally, the heart rate variability parameter, which is an index of sympathetic nervous activity, increased from 3.82\u2009\u00b1\u20092.96 to 6.86\u2009\u00b1\u20093.49 (<jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01). A correlation was found between increased tissue hemoglobin oxygen saturation and increased parameters of sympathetic nervous activity (<jats:italic>r<\/jats:italic>\u2009=\u20090.50, <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.05).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Local alternating heat and cold stimulation affected the hemodynamic response in fatigued muscle tissue and autonomic nervous activity. This stimulation is more efficient than conventional contrast baths in terms of mobility and temperature control and has potential as a new versatile therapeutic intervention for muscle fatigue.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Trial registration<\/jats:title>\n                <jats:p>UMIN-CTR (UMIN000040087: registered on April 7, 2020, <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/upload.umin.ac.jp\/cgi-open-bin\/ctr_e\/ctr_view.cgi?recptno=R000045710\">https:\/\/upload.umin.ac.jp\/cgi-open-bin\/ctr_e\/ctr_view.cgi?recptno=R000045710<\/jats:ext-link>. UMIN000040620: registered on June 1, 2020, <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"uri\" xlink:href=\"https:\/\/upload.umin.ac.jp\/cgi-open-bin\/ctr_e\/ctr_view.cgi?recptno=R000046359\">https:\/\/upload.umin.ac.jp\/cgi-open-bin\/ctr_e\/ctr_view.cgi?recptno=R000046359<\/jats:ext-link>).<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40101-024-00358-3","type":"journal-article","created":{"date-parts":[[2024,3,25]],"date-time":"2024-03-25T13:01:59Z","timestamp":1711371719000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Local alternating heat and cold stimulation affects hemodynamics and oxygenation in fatigued muscle tissue and autonomic nervous activity: a single-arm interventional study"],"prefix":"10.1186","volume":"43","author":[{"given":"Tomonori","family":"Sawada","sequence":"first","affiliation":[]},{"given":"Hiroki","family":"Okawara","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1105-2669","authenticated-orcid":false,"given":"Daisuke","family":"Nakashima","sequence":"additional","affiliation":[]},{"given":"Kentaro","family":"Aoki","sequence":"additional","affiliation":[]},{"given":"Mira","family":"Namba","sequence":"additional","affiliation":[]},{"given":"Shuhei","family":"Iwabuchi","sequence":"additional","affiliation":[]},{"given":"Yoshinori","family":"Katsumata","sequence":"additional","affiliation":[]},{"given":"Masaya","family":"Nakamura","sequence":"additional","affiliation":[]},{"given":"Takeo","family":"Nagura","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2024,3,25]]},"reference":[{"key":"358_CR1","doi-asserted-by":"publisher","first-page":"26","DOI":"10.1016\/j.ptsp.2003.10.002","volume":"5","author":"DJ Cochrane","year":"2004","unstructured":"Cochrane DJ. 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