{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T05:00:11Z","timestamp":1785214811058,"version":"3.55.0"},"reference-count":77,"publisher":"Frontiers Media SA","license":[{"start":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T00:00:00Z","timestamp":1785196800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["frontiersin.org"],"crossmark-restriction":true},"short-container-title":["Front. Physiol."],"abstract":"<jats:sec>\n                    <jats:title>Introduction<\/jats:title>\n                    <jats:p>The aim of this study is to investigate the effects of an 8-week Life Kinetics exercise program on salivary biomarkers (\u03b1-amylase, cortisol, and immunoglobulin-A) in U14 female cross-country skiers.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>\n                      A total of 20 female cross-country skiers volunteered to participate in this study. The study was designed as a pre-\/post-test controlled experimental study, and adolescent individuals were randomly assigned to either the cross-country skiing (control;\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a010) or cross-country skiing + Life Kinetics groups (experimental;\n                      <jats:italic>n<\/jats:italic>\n                      \u00a0=\u00a010). The control group participated in cross-country skiing training for 45\u00a0min, 3 days a week, for 8 weeks. The experimental group participated in Life Kinetics exercises in addition to the control group\u2019s exercises. Pre-test and post-test saliva measurements were taken before and after the 8-week protocols.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>\n                      No significant group, time, or group \u00d7 time interaction effects were observed for salivary cortisol levels (\n                      <jats:italic>p<\/jats:italic>\n                      &amp;gt; 0.05). For \u03b1-amylase, a significant group effect was detected (\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0=\u00a00.003), whereas neither the time effect nor the group \u00d7 time interaction reached statistical significance (\n                      <jats:italic>p<\/jats:italic>\n                      &amp;gt; 0.05). For sIgA, the group \u00d7 time interaction was significant (\n                      <jats:italic>p<\/jats:italic>\n                      \u00a0=\u00a00.003), while the main effects of group and time were not significant (\n                      <jats:italic>p<\/jats:italic>\n                      &amp;gt; 0.05). The experimental group demonstrated an increase in sIgA levels from pre- to post-intervention, whereas the sIgA levels decreased in the control group.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>The present findings indicate that the 8-week Life Kinetics intervention did not produce significant changes in salivary cortisol levels, suggesting no evidence of altered chronic stress regulation in adolescent female skiers. Although a significant group \u00d7 time interaction was observed for sIgA, the overall findings should be interpreted cautiously. Taken together, the results suggest that Life Kinetics training was well tolerated from a physiological stress perspective, while further studies with larger sample sizes, longer intervention periods, and repeated biomarker assessments are needed to better clarify its effects on stress- and immune-related responses.<\/jats:p>\n                  <\/jats:sec>","DOI":"10.3389\/fphys.2026.1847163","type":"journal-article","created":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T04:26:13Z","timestamp":1785212773000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["The effect of an 8-week Life Kinetics exercise program on salivary cortisol, alpha-amylase, and \u0131mmunoglobulin-A in U14 female cross-country skiers"],"prefix":"10.3389","volume":"17","author":[{"given":"Mehmet Emin","family":"Yelken","sequence":"first","affiliation":[{"name":"Ministry of Youth and Sports, Provincial Directorate of Youth and Sports","place":["Cank\u0131r\u0131, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Burcu S\u0131la","family":"Sezer","sequence":"additional","affiliation":[{"name":"Faculty of Sports Sciences, Bingol University","place":["Bing\u00f6l, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Sezgin","family":"Hepsert","sequence":"additional","affiliation":[{"name":"Ministry of Education","place":["Elaz\u0131\u011f, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hakan","family":"K\u00fc\u00e7\u00fcksayan","sequence":"additional","affiliation":[{"name":"Department of Medical Biology, Kastamonu University","place":["Kastamonu, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nisanur","family":"Canikli Temel","sequence":"additional","affiliation":[{"name":"Faculty of Sports Sciences, Ayd\u0131n Adnan Menderes University","place":["Ayd\u0131n, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"G\u00f6ktu\u011f","family":"Mugan","sequence":"additional","affiliation":[{"name":"Independent Researcher","place":["Ankara, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Umut","family":"Y\u0131lmaz","sequence":"additional","affiliation":[{"name":"Department of Coaching Education, Faculty of Sport Sciences, University of Hakkari","place":["Hakkari, T\u00fcrkiye"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1965","published-online":{"date-parts":[[2026,7,28]]},"reference":[{"key":"B1","doi-asserted-by":"publisher","first-page":"22","DOI":"10.63494\/jupisi.v2i2.155","article-title":"Metode life kinetik dan pengembangan teknik taekwondo","volume":"2","author":"Agus","year":"2023","journal-title":"Jurn. 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