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The feasibility of the physical fitness tests and IPAQ was explored. Forty\u2010three adults (22 women) participated. Mean age was 38\u2009years (range 16\u201369\u2009years). Mean differences (95% CI) for men and women with ACH compared to reference values were: VO<jats:sub>2<\/jats:sub> peak. \u22127.0 m\/min\/kg (\u221213.6 to \u22120.5, <jats:italic>p<\/jats:italic> =\u2009.037), and\u2009\u2212 7.9 ml\/kg\/min (\u221211.6 to \u22124.3, <jats:italic>p<\/jats:italic> &lt;\u2009.001); 6MWT \u2212270.8 m (\u2212340.4 to \u2212201.2, <jats:italic>p<\/jats:italic> &lt;\u2009.001), and\u2009\u2212\u2009196.7 m (\u2212244.3 to \u2212149.0, <jats:italic>p<\/jats:italic> =\u2009.001); 30sSTS \u20104.6 repetitions (\u22127.8 to \u22121.5, <jats:italic>p<\/jats:italic> =\u2009.006), and\u2009\u2212 1.1 repetitions (\u22123.4 to 1.1, <jats:italic>p<\/jats:italic> =\u2009.335). There were no differences within ACH participants, except for VO<jats:sub>2<\/jats:sub> peak, where men performed better. Sufficient physical activity (&gt;\u2009600 metabolic equivalent of task weekly) was achieved by 79% of the participants. The feasibility of the 6MWT and 30sSTS was good. There was a strong correlation between the VO<jats:sub>2<\/jats:sub> peak and 6MWT (men: r = 0.63, <jats:italic>p<\/jats:italic> =\u2009.007; women: r = 0.71, <jats:italic>p<\/jats:italic> &lt;\u2009.001). The findings indicate that the 6MWT and 30sSTS test are useful in assessing functional exercise capacity and muscle strength in adults with ACH.<\/jats:p>","DOI":"10.1002\/ajmg.a.62055","type":"journal-article","created":{"date-parts":[[2020,12,31]],"date-time":"2020-12-31T14:12:34Z","timestamp":1609423954000},"page":"1023-1032","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Physical fitness and activity level in Norwegian adults with achondroplasia"],"prefix":"10.1002","volume":"185","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7397-0321","authenticated-orcid":false,"given":"Olga Marieke","family":"de Vries","sequence":"first","affiliation":[{"name":"Sunnaas Rehabilitation Hospital, TRS National Resource Centre for Rare Disorders  Nesodden Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1396-6715","authenticated-orcid":false,"given":"Heidi","family":"Johansen","sequence":"additional","affiliation":[{"name":"Sunnaas Rehabilitation Hospital, TRS National Resource Centre for Rare Disorders  Nesodden Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2804-5783","authenticated-orcid":false,"given":"Svein Otto","family":"Fredwall","sequence":"additional","affiliation":[{"name":"Sunnaas Rehabilitation Hospital, TRS National Resource Centre for Rare Disorders  Nesodden Norway"},{"name":"Faculty of Medicine, Institute of Clinical Medicine University of Oslo  Norway"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2020,12,31]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/cge.12045"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1164\/ajrccm.166.1.at1102"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1161\/CIR.0b013e3181e52e69"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1097\/00005768-200001000-00012"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1016\/j.annepidem.2009.01.019"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/jep.12629"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.5271\/sjweh.1815"},{"key":"e_1_2_9_9_1","doi-asserted-by":"publisher","DOI":"10.5040\/9781492595717"},{"key":"e_1_2_9_10_1","doi-asserted-by":"publisher","DOI":"10.1249\/MSS.0000000000000263"},{"key":"e_1_2_9_11_1","doi-asserted-by":"publisher","DOI":"10.3810\/psm.2011.05.1904"},{"key":"e_1_2_9_12_1","volume-title":"Statistical power analysis for the behavioral sciences","author":"Cohen J. 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