{"?xml":{"@version":"1.0"},"edm:RDF":{"@xmlns:dc":"http://purl.org/dc/elements/1.1/","@xmlns:edm":"http://www.europeana.eu/schemas/edm/","@xmlns:wgs84_pos":"http://www.w3.org/2003/01/geo/wgs84_pos","@xmlns:foaf":"http://xmlns.com/foaf/0.1/","@xmlns:rdaGr2":"http://rdvocab.info/ElementsGr2","@xmlns:oai":"http://www.openarchives.org/OAI/2.0/","@xmlns:owl":"http://www.w3.org/2002/07/owl#","@xmlns:rdf":"http://www.w3.org/1999/02/22-rdf-syntax-ns#","@xmlns:ore":"http://www.openarchives.org/ore/terms/","@xmlns:skos":"http://www.w3.org/2004/02/skos/core#","@xmlns:dcterms":"http://purl.org/dc/terms/","edm:WebResource":[{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7RFC7UUJ/e0a06600-e7b3-42e0-98a7-820b419a0263/PDF","dcterms:extent":"674 KB"},{"@rdf:about":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7RFC7UUJ/38590dfd-8c6d-4c6a-ab64-a91100bf2cb4/TEXT","dcterms:extent":"0 KB"}],"edm:TimeSpan":{"@rdf:about":"2005-2025","edm:begin":{"@xml:lang":"en","#text":"2005"},"edm:end":{"@xml:lang":"en","#text":"2025"}},"edm:ProvidedCHO":{"@rdf:about":"URN:NBN:SI:DOC-7RFC7UUJ","dcterms:isPartOf":[{"@rdf:resource":"https://www.dlib.si/details/URN:NBN:SI:spr-OTYUOTZX"},{"@xml:lang":"sl","#text":"Šport (Ljubljana)"}],"dcterms:issued":"2021","dc:creator":["Čoh, Milan","Gostiša, Jurij","Sečnik, Matej","Širok, Brane"],"dc:format":[{"@xml:lang":"sl","#text":"številka:1/2"},{"@xml:lang":"sl","#text":"letnik:69"},{"@xml:lang":"sl","#text":"str. 131-141"}],"dc:identifier":["ISSN:0353-7455","COBISSID:67588867","URN:URN:NBN:SI:doc-7RFC7UUJ"],"dc:language":"sl","dc:publisher":{"@xml:lang":"sl","#text":"Fakulteta za šport"},"dc:subject":[{"@xml:lang":"en","#text":"air flow"},{"@xml:lang":"en","#text":"biomechanics"},{"@xml:lang":"sl","#text":"biomehanika"},{"@xml:lang":"en","#text":"kinetics"},{"@xml:lang":"sl","#text":"kinetika"},{"@xml:lang":"en","#text":"running"},{"@xml:lang":"en","#text":"sport"},{"@xml:lang":"sl","#text":"šport"},{"@xml:lang":"sl","#text":"tek"},{"@xml:lang":"sl","#text":"tekoča preproga"},{"@xml:lang":"en","#text":"treadmill"},{"@xml:lang":"sl","#text":"vetrovniki"},{"@xml:lang":"en","#text":"wind tunnels"},{"@xml:lang":"sl","#text":"zračni tok"}],"dcterms:temporal":{"@rdf:resource":"2005-2025"},"dc:title":{"@xml:lang":"sl","#text":"Spremembe kinematičnih in kinetičnih parametrov tekaškega koraka v vetrovniku|"},"dc:description":[{"@xml:lang":"sl","#text":"The aim of the study was to establish the changes in biokinetic parameters of running in a wind tunnel, while generating different air flows, along with a presentation of the technology of kinetics in a wind tunnel. The study was conducted in the wind tunnel of the Planica Nordic Centre, Slovenia. The sample of subjects included three trained runners who participate in middle-distance running. We used the Air Runner Assault treadmill that was fastened in the wind tunnel and included 4 sensors for measuring vertical and horizontal ground reaction forces. The subjects were running within the wind tunnel, with air flow directed towards their back (wind speed towards the back: + 3 m/s and +5 m/s) and towards the chest (-5 m/s and -7 m/s). Further on, we measured stride frequency, contact and flight phases, vertical and horizontal components of ground reaction forces, and vertical and horizontal impulses in the running stride deceleration and acceleration phases. Each runner's speed was measured using the Photron UX100 high-speed camera, at a frequency of 1,000 Hz, which was fastened perpendicularly to the meridian plane of the wind tunnel horizontal channel. The measurements of forces and recordings of the high-speed camera were subsequently processed using the LabView software. The results show changes in the ratio of the contact and flight phases due to the specifics of running on a treadmill. The contact phases of the running stride lasted longer than the flight phases, i.e. from 0.15 to 0.20 s. Maximum vertical forces reached over 2,000 N. The vertical force values are independent from the direction and force of the air flow. Horizontal forces in the contact phase are strongly dependent on the air flow currents. When the wind is directed towards the back of the runner (+3 m/s and +5 m/s), the phase of negative force at the contact of the foot with the treadmill is prolonged (deceleration phase). When the wind is directed towards the chest of the runner (-5 m/s and -7 m/s), the deceleration phase becomes shorter and the gradient of the increasing force is higher. Maximum forces in the take-off are higher than in the case of running with air flow directed towards the back. It cannot be concluded that the stride frequency largely depends on the air flow currents"},{"@xml:lang":"sl","#text":"Namen študije je bil ugotoviti spremembe biokinetičnih parametrov teka v vetrovniku pri generiranju različnega zračnega toka ob hkratni predstavitvi tehnologije kinetike v vetrovniku. Raziskava je bila izvedena v vetrovniku \"Nordijskega centra Planica - NCP\". V vzorec merjencev so bili vključeni trije trenirani tekači v tekih na srednje proge. Uporabili smo tekočo preprogo (treadmill) Air Runner Assault, ki je bila pritrjena v kanal vetrovnika prek štirih senzorjev za merjenje vertikalnih in horizontalnih sil reakcije podlage. Merjenci so opravili teke v vetrovniku pri pogojih usmerjenega zračnega toka v hrbet (hitrost vetra v hrbet +3m/s in +5 m/s) in v prsi (-5 m/s in -7 m/s). Pri tem smo merili frekvenco korakov, kontaktne in letne faze, vertikalne in horizontalne komponente sile reakcije na podlago ter vertikalne in horizontalne impulze v fazi zaviranja in fazi pospeševanja tekaškega koraka. Hitrost tekača smo merili z ultrahitro kamero Photron UX100, s frekvenco 1000 Hz, nameščeno pravokotno na meridiansko ravnino horizontalnega kanala vetrovnika. Meritve sil in posnetke hitre kamere smo obdelali v programu LabView. Rezultati kažejo na spremembe v razmerju kontaktnih in letnih faz zaradi specifike teka na tekoči preprogi. Kontaktne faze tekaškega koraka so časovno daljše od letnih faz, njihovo trajanje je 0,15 do 0,20 s. Maksimalne vertikalne sile dosegajo vrednost več kot 2000 N. Vrednosti vertikalnih sil so neodvisne od smeri in jakosti zračnega toka. Horizontalne sile v fazi kontakta so v močni odvisnosti od strujanja zračnega toka. Pri vetru v hrbet (+3 m/s in +5 m/s) se podaljša faza negativne sile pri stiku stopala s tekočo preprogo (faza zaviranja). Pri vetru v prsi (-5 m/s in -7 m/s) se faza zaviranja skrajša, gradient naraščanja sile pa je večji. Maksimalne sile pri odrivu (take off) so večje kot v primeru teka s strujanjem vetra v hrbet. Za frekvenco korakov ne moremo zaključiti, da je v veliki meri odvisna od strujanja zračnega toka"}],"edm:type":"TEXT","dc:type":[{"@xml:lang":"sl","#text":"znanstveno časopisje"},{"@xml:lang":"en","#text":"journals"},{"@rdf:resource":"http://www.wikidata.org/entity/Q361785"}]},"ore:Aggregation":{"@rdf:about":"http://www.dlib.si/?URN=URN:NBN:SI:DOC-7RFC7UUJ","edm:aggregatedCHO":{"@rdf:resource":"URN:NBN:SI:DOC-7RFC7UUJ"},"edm:isShownBy":{"@rdf:resource":"http://www.dlib.si/stream/URN:NBN:SI:DOC-7RFC7UUJ/e0a06600-e7b3-42e0-98a7-820b419a0263/PDF"},"edm:rights":{"@rdf:resource":"http://rightsstatements.org/vocab/InC/1.0/"},"edm:provider":"Slovenian National E-content Aggregator","edm:intermediateProvider":{"@xml:lang":"en","#text":"National and University Library of Slovenia"},"edm:dataProvider":{"@xml:lang":"sl","#text":"Univerza v Ljubljani, Fakulteta za šport"},"edm:object":{"@rdf:resource":"http://www.dlib.si/streamdb/URN:NBN:SI:DOC-7RFC7UUJ/maxi/edm"},"edm:isShownAt":{"@rdf:resource":"http://www.dlib.si/details/URN:NBN:SI:DOC-7RFC7UUJ"}}}}