{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,23]],"date-time":"2026-09-23T17:42:37Z","timestamp":1790185357019,"version":"4.1.0"},"reference-count":40,"publisher":"Wiley","issue":"2","license":[{"start":{"date-parts":[[2020,10,5]],"date-time":"2020-10-05T00:00:00Z","timestamp":1601856000000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Scandinavian Med Sci Sports"],"published-print":{"date-parts":[[2021,2]]},"abstract":"<jats:title>Summary<\/jats:title><jats:p>Anemia manifested as reduced red blood cell (RBC) amounts or hemoglobin levels has been associated with lower cardiorespiratory fitness. However, the relationship of smaller RBC with physical fitness was unknown. We included 2933 non\u2010anemic military males (hemoglobin levels: 11.1\u201015.9\u00a0g\/dL and mean corpuscular volume (MCV) &lt;100 fL) in Taiwan during 2014. Aerobic fitness was assessed by time for a 3000\u2010meter run, and anaerobic fitness was evaluated by numbers of sit\u2010ups and push\u2010ups, each performed within 2\u00a0minutes. Multiple linear and logistic regression models adjusting for age, service specialty, lipid profiles, and hemoglobin levels were used to determine the associations. Microcytosis and normocytosis were defined as MCV\u00a0\u2264\u00a070 fL (n\u00a0=\u00a0190) and MCV\u00a0&gt;\u00a070 fL (n\u00a0=\u00a02743), respectively. The linear regression shows that as compared with microcytosis, normocytosis was associated with more numbers of sit\u2010ups performed within 2\u00a0minutes (<jats:italic>\u03b2<\/jats:italic>\u00a0=\u00a01.51, <jats:italic>P<\/jats:italic>\u2010value\u00a0=\u00a00.02). The logistic regression also reveals that those males with microcytosis had higher probability as the worst 10% performers in the 2\u2010minute push\u2010up test (odds ratio: 1.91, 95% confidence intervals: 1.18\u20103.12). By contrast, there was no association of microcytosis with 3000\u2010meter running time. Our study suggests that non\u2010anemic microcytosis was associated with lower anaerobic fitness but not with aerobic fitness. Whether the causative factors for microcytosis such as iron deficiency status and thalassemia trait unavailable in the study might account for the relationship needs further investigations.<\/jats:p>","DOI":"10.1111\/sms.13836","type":"journal-article","created":{"date-parts":[[2020,9,26]],"date-time":"2020-09-26T13:06:29Z","timestamp":1601125589000},"page":"295-302","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Association of red blood cell size and physical fitness in a military male cohort: The CHIEF study"],"prefix":"10.1111","volume":"31","author":[{"given":"Shiue\u2010Wei","family":"Lai","sequence":"first","affiliation":[{"name":"Departments of Medicine Tri\u2010Service General Hospital National Defense Medical Center Taipei Taiwan"},{"name":"Department of Medicine Hualien Armed Forces General Hospital Hualien 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