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However, few data exist on nonprofessional individuals, and none of them have investigated the regulation of energy balance in female participants during an Arctic expedition. Eleven nonathlete female adults who reached the North Pole by ski in full autonomy were studied. Before and the day after the expedition, resting metabolic rate (RMR) was measured by indirect calorimetry, and fat mass (FM) and fat\u2010free mass (FFM) by bioelectric impedance. Total daily energy expenditure (TDEE) and activity\u2010related energy expenditure (AEE) were assessed with the doubly labeled water (DLW) during the expedition. Before and throughout the expedition, daily physical activity was evaluated using accelerometry and heart rate, while surface skin temperature was measured using an iButton placed on the chest. Additionally, fasting salivary cortisol concentration was measured throughout the expedition as a stress marker. The seven\u2010day trekking was associated with a TDEE of 18.67 [SD 1.72] MJ\/d. Body mass decreased by 1.67 (SE 0.42) kg, mostly due to fat mass loss (\u22121.26 [0.39] kg), indicating a negative energy balance. These findings show that nonathlete females can greatly increase their AEE and, hence TDEE over a short time period. However, their food consumption was insufficient to meet their needs, thus leading to an energy deficit and body mass loss. Future studies should investigate whether this insufficient energy intake was due to a lack of available food or an inability to consume more, thereby deepening our understanding of energy balance regulation in extreme conditions.<\/jats:p>","DOI":"10.14814\/phy2.70443","type":"journal-article","created":{"date-parts":[[2025,6,30]],"date-time":"2025-06-30T23:07:41Z","timestamp":1751324861000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Energy balance in women during polar trekking\u2014The <scp>POWER<\/scp> study"],"prefix":"10.14814","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-4216-7725","authenticated-orcid":false,"given":"Pierre","family":"Bourdier","sequence":"first","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR7178  Strasbourg France"},{"name":"Universit\u00e9 de Haute\u2010Alsace, IRIMAS UR7499  Mulhouse France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jessica","family":"Devitt","sequence":"additional","affiliation":[{"name":"Department of Family Medicine University of Colorado, Anschutz Medical Campus  Aurora Colorado USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Susan","family":"Gallon","sequence":"additional","affiliation":[{"name":"Network of Marine Protected Areas in the Mediterranean (MedPAN)  Marseille France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alexandre","family":"Zahariev","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR7178  Strasbourg France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Isabelle","family":"Chery","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR7178  Strasbourg France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jacob R.","family":"Guzzetti","sequence":"additional","affiliation":[{"name":"Behaviour\u2010Brain\u2010Body Research Centre University of South Australia  Adelaide Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"St\u00e9phane","family":"Blanc","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR7178  Strasbourg France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chantal","family":"Simon","sequence":"additional","affiliation":[{"name":"CarMen Laboratory, INSERM 1060, INRAE 1397 University of Lyon  Oullins France"},{"name":"Human Nutrition Research Centre of Rh\u00f4ne\u2010Alpes Hospices Civils de Lyon  Lyon France"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1266-5144","authenticated-orcid":false,"given":"Audrey","family":"Bergouignan","sequence":"additional","affiliation":[{"name":"Universit\u00e9 de Strasbourg, CNRS, IPHC UMR7178  Strasbourg France"},{"name":"Division of Endocrinology, Metabolism and Diabetes Anschutz Health &amp; Wellness Center, University of Colorado, Anschutz Medical Campus  Aurora Colorado USA"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2025,6,30]]},"reference":[{"key":"e_1_2_11_2_1","doi-asserted-by":"publisher","DOI":"10.3390\/nu12061638"},{"key":"e_1_2_11_3_1","article-title":"Special considerations for measuring energy expenditure with doubly labeled water under atypical conditions","volume":"5","author":"Bhutani S.","year":"2015","journal-title":"Journal of Obesity & Weight Loss Therapy"},{"key":"e_1_2_11_4_1","first-page":"381","article-title":"Use of food quotients to predict respiratory quotients for the doubly\u2010labelled water method of measuring energy expenditure","volume":"40","author":"Black A. 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