{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,12,19]],"date-time":"2025-12-19T15:31:53Z","timestamp":1766158313220,"version":"build-2065373602"},"reference-count":17,"publisher":"Wiley","issue":"7","license":[{"start":{"date-parts":[[2019,8,14]],"date-time":"2019-08-14T00:00:00Z","timestamp":1565740800000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":["movementdisorders.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Movement Disord Clin Pract"],"published-print":{"date-parts":[[2019,9]]},"abstract":"<jats:title>ABSTRACT<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>Skater's cramp is an involuntary lower leg movement in skilled speed skaters. We aim to evaluate whether skater's cramp is compatible with task\u2010specific dystonia.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>A case\u2010control study tested 5 speed skaters exhibiting symptoms of skater's cramp and 5 controls. Affected skaters completed a standardized questionnaire and neurological examination. Video analyses included skating normally, intensely, and with extra mass around the skater's ankles. An Inertial Motion Capturing (IMC) device mounted on both skates provided angular velocity data for both feet.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Median time of onset of skater's cramp occurred after 12 (range 3\u201322) years of speed skating. Skater's cramp appeared as task specific; its onset was sudden and correlated to stress and aberrant proprioception. Symptoms presented acutely and consistently during skating, unilaterally in 4 and bilaterally in 1 skater. Visually, skater's cramp was an active, patterned, and person\u2010specific jerking of a skater's foot, either exo\u2010 or endorotationally. It presented asymmetrically, repeating persistently as the foot neared the end of the swing phase. The skater's affected leg had a longer swing phase (median, 1.37 [interquartile range {IQR}, 0.35]\/1.18 [IQR, 0.24] seconds; <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01), a shorter glide phase (median, 1.09 [IQR, 0.25]\/1.26 (IQR, 0.29) seconds; <jats:italic>P<\/jats:italic>\u2009&lt;\u20090.01), and higher angular velocity during the jerking motion. Symptoms remained constant irrespective of speed or extra mass around the ankle (<jats:italic>P<\/jats:italic>\u2009&gt;\u20090.05). No significant differences between legs were detected in the control group.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>Observed clinical, visual, and kinematic data could be an early and tentative indication of task\u2010specific dystonia.<\/jats:p><\/jats:sec>","DOI":"10.1002\/mdc3.12799","type":"journal-article","created":{"date-parts":[[2019,6,13]],"date-time":"2019-06-13T08:25:03Z","timestamp":1560414303000},"page":"559-566","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":8,"title":["Skater's Cramp: A Possible Task\u2010Specific Dystonia in Dutch Ice Skaters"],"prefix":"10.1002","volume":"6","author":[{"given":"Beorn","family":"Nijenhuis","sequence":"first","affiliation":[{"name":"Department of Neurology University Medical Center Groningen, University Groningen  Groningen the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Aron H.P.","family":"Schalkwijk","sequence":"additional","affiliation":[{"name":"Department of Neurology University Medical Center Groningen, University Groningen  Groningen the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sharon","family":"Hendriks","sequence":"additional","affiliation":[{"name":"Department of Neurology University Medical Center Groningen, University Groningen  Groningen the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Rodi","family":"Zutt","sequence":"additional","affiliation":[{"name":"Department of Neurology Haga Teaching Hospital  the Hague the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Egbert","family":"Otten","sequence":"additional","affiliation":[{"name":"Department of Movement Sciences University Groningen  Groningen Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8970-8774","authenticated-orcid":false,"given":"Marina A.J.","family":"Tijssen","sequence":"additional","affiliation":[{"name":"Department of Neurology University Medical Center Groningen, University Groningen  Groningen the Netherlands"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2019,8,14]]},"reference":[{"key":"e_1_2_8_2_1","article-title":"Een schaatser met een zwabbervoet [A skater with skater's cramp]","author":"Meijer L.","year":"2013","journal-title":"Fysiopraxis"},{"key":"e_1_2_8_3_1","article-title":"Reactie op \u2018Een schaatser met een zwabbervoet\u2019 [Reaction to \u2018A skater with skater's cramp']","author":"Dool 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