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Yet, the impact of iron deficiency on physical capacities beyond endurance is not clear. <jats:italic><jats:bold>Purpose<\/jats:bold>:<\/jats:italic> The purpose of this study was to assess variations in seasonal micronutrient concentrations and how iron deficiency impacts external-load measures in elite female rugby league players. <jats:italic><jats:bold>Methods<\/jats:bold>:<\/jats:italic> Iron and vitamin D status were measured in 28 players (age 24 [4]\u00a0y, body mass 76 [11]\u00a0kg) across 3 time points of the 17-week National Rugby League Women\u2019s season. Physical demands were evaluated using external-load measures (eg,\u00a0total distance, PlayerLoad) for training and competition. Linear mixed-effects models were employed to assess the effect of change in serum ferritin concentration on external-load measures. Effect sizes with 95% CIs were calculated to interpret the magnitude of difference in change in indices and performance outcomes between iron-deficient and iron-sufficient players. <jats:italic><jats:bold>Results<\/jats:bold>:<\/jats:italic> Iron-deficiency prevalence ranged from 26% to 57% across the season, and &lt;22% of players were vitamin D deficient at each time point. Weak to strong positive associations (<jats:italic>R<\/jats:italic><jats:sup>2<\/jats:sup>\u2009=\u2009.3\u2013.6) were observed between all external-load measures and moderating variables (serum ferritin, week, position, and athlete). However, these associations were largely attributable to the contribution of week and position. Differences in load measures between iron-deficient and iron-sufficient players were mostly trivial to small. <jats:italic><jats:bold>Conclusions<\/jats:bold>:<\/jats:italic> Iron status of elite female rugby league players had little effect on most workload measures within this cohort. However, longitudinal monitoring is warranted to identify how external-load measures are affected individually in response to fluctuations in serum ferritin.<\/jats:p>","DOI":"10.1123\/ijspp.2024-0266","type":"journal-article","created":{"date-parts":[[2025,1,27]],"date-time":"2025-01-27T19:46:38Z","timestamp":1738007198000},"page":"411-419","source":"Crossref","is-referenced-by-count":1,"title":["Running Low: A Seasonal Analysis of Micronutrient Deficiencies on External-Load Measures in Elite Female Rugby League Players"],"prefix":"10.1123","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-6493-7172","authenticated-orcid":true,"given":"Michael","family":"Pengelly","sequence":"first","affiliation":[{"name":"Research Institute for Sport and Exercise (UCRISE), University of Canberra, Canberra, ACT, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3757-3972","authenticated-orcid":true,"given":"Kate","family":"Pumpa","sequence":"additional","affiliation":[{"name":"Research Institute for Sport and Exercise (UCRISE), University of Canberra, Canberra, ACT, Australia"},{"name":"Health Sciences Centre, University College Dublin, Belfield, Ireland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1555-5079","authenticated-orcid":true,"given":"David B.","family":"Pyne","sequence":"additional","affiliation":[{"name":"Research Institute for Sport and Exercise (UCRISE), University of Canberra, Canberra, ACT, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-0642-8230","authenticated-orcid":true,"given":"Naroa","family":"Etxebarria","sequence":"additional","affiliation":[{"name":"Research Institute for Sport and Exercise (UCRISE), University of Canberra, Canberra, ACT, Australia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"100","reference":[{"issue":"11","key":"r1","series-title":"J Strength Cond Res","first-page":"2970","article-title":"Physical demands on young elite European female basketball players with special reference to speed, agility, explosive strength, and take-off power","volume":"24","author":"Erculj F","year":"2010","unstructured":"Erculj F, Blas M, Bracic M. 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