{"doi":"10.1111/sms.70050","title":"Running Economy After a Low‐ and High‐Intensity Training Session in Naturally Menstruating Endurance‐Trained Female Athletes: The <scp>FENDURA</scp> Project","abstract":"The ability to maintain running economy is generally evaluated during a long continuous exercise bouts, and it is unclear whether the menstrual cycle phase acts as a confounder. The first aim of this study was to evaluate the ability to maintain running economy during typical 1-h low- (LIT) and high-intensity training (HIT) sessions in female athletes. The second aim was to investigate whether menstrual cycle phase affected the ability to maintain running economy. Naturally menstruating endurance-trained females performed three LIT (n = 16) (45%-55% of the maximal velocity achieved during the maximal incremental test) and/or three HIT sessions (n = 17) (5 × 4 min at 80% of the maximal velocity achieved during the maximal incremental test) during three distinct menstrual cycle phases: early follicular, ovulatory, and mid luteal. Running economy was determined before and after each session. Running economy, expressed as energy cost (before: 1.34; after: 1.34 kcal/kg/km, p = 0.797) and oxygen cost (before: 272, after: 273 mL/kg/min, p = 0.348), was not significantly different before versus after the LIT session. Energy cost (before 1.33; after: 1.34 kcal/kg/km, p = 0.130) was not significantly different before versus after the HIT session, but oxygen cost (before: 269; after: 274 mL/kg/km, p < 0.003) was slightly higher after the session. Menstrual cycle phase did not confound the ability to maintain running economy. Running economy can be maintained during a typical 1-h LIT session. The ability to maintain running economy during a typical HIT session depends on the expression used; energy cost was unaffected, while oxygen cost may be slightly increased after HIT sessions.","journal":"Scandinavian Journal of Medicine and Science in Sports","year":2025,"id":539175,"datarank":0.0,"base_score":0.0,"endowment":0.0,"self_citation_contribution":0.0,"citation_network_contribution":0.0,"self_endowment_contribution":0.0,"citer_contribution":0.0,"corpus_percentile":null,"corpus_rank":null,"citation_count":3,"citer_count":0,"citers_with_citation_signal":0,"citers_with_endowment":0,"datacite_reuse_total":0,"is_dataset":false,"is_dataset_confidence":0.9619,"is_data_producer":false,"deposit_databanks":null,"is_oa":true,"file_count":0,"downloads":0,"has_version_chain":false,"published_date":"2025-01-01","fair_score":null,"fair_percentile":null,"algorithm_id":"datarank_citation_only_1hop_v6","ranking_scope":"data_only","authors":[{"id":1426344,"name":"Madison Taylor","orcid":"0009-0000-4241-3004","position":1,"is_corresponding":false},{"id":1426719,"name":"Anna Lena Müller","orcid":null,"position":2,"is_corresponding":false},{"id":1426345,"name":"Jos J. de Koning","orcid":"0000-0002-5596-0282","position":3,"is_corresponding":false},{"id":1426346,"name":"Øyvind Sandbakk","orcid":"0000-0002-9014-5152","position":4,"is_corresponding":false},{"id":1426347,"name":"John O. Osborne","orcid":"0000-0001-8681-8521","position":5,"is_corresponding":false},{"id":1426348,"name":"Dionne A. Noordhof","orcid":"0000-0002-1630-4696","position":6,"is_corresponding":false},{"id":1426343,"name":"Heleen Docter","orcid":"0000-0001-9094-992X","position":0,"is_corresponding":true}],"reference_count":43,"raw_metadata":null,"created_at":"2026-07-19T02:52:30.048313Z","pmid":"40186379","pmcid":null,"fwci":null,"citation_percentile":null,"influential_citations":0,"oa_status":null,"license":null,"views":0,"total_file_size_bytes":0,"version_count":0,"fair_f":null,"fair_a":null,"fair_i":null,"fair_r":null,"fair_zscore":null,"fair_rationale":null,"fair_model":null,"fair_agent_version":null,"fair_fulltext_source":null,"fair_has_llm":null,"fair_computed_at":null,"clinical_trials":[],"software_tools":[],"db_accessions":[],"linked_datasets":[],"topics":[]}