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This study investigated how 8\u2010week moderate intensity endurance training (MIET) affects these outcomes in recreationally active women. Naturally menstruating women (NoOC,\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u200917) and combined oral contraceptive users (COC,\n                    <jats:italic>n<\/jats:italic>\n                    \u2009=\u20098) were assessed in the luteal\/follicular phases and active\/inactive phases before and after MIET. REE and respiratory exchange ratio (RER; by indirect calorimetry), body composition, estradiol, progesterone, free triiodothyronine (fT3), acylated and unacylated ghrelin were measured at rest. Linear mixed models with time, group, and their interaction were used to analyze the results in two stratified phase comparisons. No interaction effects were observed, but a main effect of time for RER was observed in the pooled sample, indicating a 5.6% increase (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009=\u20090.004) at follicular\/inactive phase. The COC group also had higher fT3 concentrations at all time points (\n                    <jats:italic>p<\/jats:italic>\n                    \u2009&lt;\u20090.05). Two participants from different groups showed consistent \u226510% REE changes. An 8\u2010week MIET did not induce detectable changes in REE, body composition, or metabolic hormones on a group level, but high individual variation was observed.\n                  <\/jats:p>","DOI":"10.14814\/phy2.70591","type":"journal-article","created":{"date-parts":[[2025,10,1]],"date-time":"2025-10-01T05:21:06Z","timestamp":1759296066000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Influence of 8\u2010week endurance training on resting energy expenditure and body composition in women"],"prefix":"10.14814","volume":"13","author":[{"given":"Ida E.","family":"L\u00f6fberg","sequence":"first","affiliation":[{"name":"Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aino","family":"Kuljukka","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Vera M.","family":"Salmi","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9428-4689","authenticated-orcid":false,"given":"Johanna K.","family":"Ihalainen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"},{"name":"Research Institute for Olympic Sport (KIHU)  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heikki","family":"Kyr\u00f6l\u00e4inen","sequence":"additional","affiliation":[{"name":"Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Jyv\u00e4skyl\u00e4 Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Anthony C.","family":"Hackney","sequence":"additional","affiliation":[{"name":"Department of Exercise &amp; Sport Science\u2013Department of Nutrition University of North Carolina  Chapel Hill North Carolina USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ritva S.","family":"Mikkonen","sequence":"additional","affiliation":[{"name":"Sports Technology Unit, Faculty of Sport and Health Sciences University of Jyv\u00e4skyl\u00e4  Vuokatti Finland"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2025,9,30]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0b013e31821ece12"},{"key":"e_1_2_11_3_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0b013e3182059eda"},{"key":"e_1_2_11_4_1","doi-asserted-by":"publisher","DOI":"10.1007\/s00421\u2010002\u20100737\u20107"},{"key":"e_1_2_11_5_1","doi-asserted-by":"publisher","DOI":"10.1371\/journal.pone.0236025"},{"key":"e_1_2_11_6_1","doi-asserted-by":"publisher","DOI":"10.1097\/00005768\u2010200106000\u201000012"},{"key":"e_1_2_11_7_1","doi-asserted-by":"publisher","DOI":"10.1007\/s10865\u2010018\u20109990\u2010z"},{"key":"e_1_2_11_8_1","doi-asserted-by":"publisher","DOI":"10.1210\/jcem\u201054\u20101\u201053"},{"key":"e_1_2_11_9_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.00818.2020"},{"key":"e_1_2_11_10_1","doi-asserted-by":"publisher","DOI":"10.1123\/ijsnem.2018\u20100142"},{"key":"e_1_2_11_11_1","doi-asserted-by":"publisher","DOI":"10.1123\/ijsnem.11.1.15"},{"key":"e_1_2_11_12_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40519\u2010018\u20100599\u20106"},{"key":"e_1_2_11_13_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.cub.2021.08.016"},{"key":"e_1_2_11_14_1","doi-asserted-by":"publisher","DOI":"10.1530\/EJE\u201011\u20100334"},{"key":"e_1_2_11_15_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jada.2006.02.009"},{"key":"e_1_2_11_16_1","doi-asserted-by":"publisher","DOI":"10.1123\/wspaj.2021\u20100028"},{"key":"e_1_2_11_17_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0b013e3181949333"},{"key":"e_1_2_11_18_1","doi-asserted-by":"publisher","DOI":"10.1152\/japplphysiol.00346.2023"},{"key":"e_1_2_11_19_1","doi-asserted-by":"publisher","DOI":"10.1002\/oby.21919"},{"key":"e_1_2_11_20_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40279\u2010020\u201001317\u20105"},{"key":"e_1_2_11_21_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40279\u2010021\u201001435\u20108"},{"key":"e_1_2_11_22_1","doi-asserted-by":"publisher","DOI":"10.1007\/s40279\u2010018\u20100897\u20101"},{"key":"e_1_2_11_23_1","doi-asserted-by":"publisher","DOI":"10.1172\/JCI9725"},{"key":"e_1_2_11_24_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.jand.2015.04.003"},{"key":"e_1_2_11_25_1","unstructured":"Golden Cheetah. 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