277 KB0 KB200520252019Čop, KatjaTomažin, Katjaštevilka:3/4letnik:67str. 203-208ISSN:0353-7455COBISSID:5639089URN:URN:NBN:SI:doc-B53H6T3KslFakulteta za športŠport (Ljubljana)balancepost-activation potentationpost-aktivacijska potenciacijaravnotežjesportšporttandem stancetandemska stojaUčinek nalog, ki kratkotrajno izboljšajo delovanje živčno mišičnega sistema na ravnotežje|The aim was to compare the effects of three warm up protocols on postural control. Seventeen volunteers performed tandem stance with eyes closed (EC) pre- and post-warm up (0.5 min, 6 min and 12 min). Pre- and post-warm up, the displacement velocities and amplitudes of the center of pressure during tandem stance were assessed. Three different warm up protocols in randomized order were performed: (i) six minutes of low-intensity (20 cm, 60 to 65 % of maximal heart rate) stepping, (ii) six minutes of low-intensity stepping with additional plyometric conditioning activity, i.e., jumps (6 repetitions in 3 sets, 2.5 min inter-set rest) and (iii) six minutes of low-intensity stepping with additional maximal isometric conditioning activity (maximal leg extension, 3 repetitions in 5 to 8 s, 2.5 min inter-set rest). In comparison with pre-warm up, only low-intensity stepping with added plyometric conditioning activity improves the quality of performing the tandem stance with EC, probably due to increased sensitivity of muscle spindle. But 12 minutes of recovery are required to obtain postural control enhancement. On the other hand, low-intensity stepping with isometric conditioning activity diminished postural control. In conclusion, plyometric conditioning activity should precede balance exercise, particularly, when warm-up procedure consists of low-intensity whole body exerciseNamen raziskave je bil primerjati učinke treh ogrevanj na kakovost izvedbe tandemske stoje z zaprtimi očmi. Sedemnajst prostovoljcev je izvedlo tandemsko stojo pred ogrevanjem in po ogrevanju v treh časovnih točkah (0,5 min, 6 min in 12 min). Med tandemsko stojo smo s pritiskovno ploščo merili hitrost in amplitudo nihanja oprijemališča sile reakcije podlage. Ogrevanja so bila izvedena po naključnem vrstnem redu: (i) nizko intenzivno stopanje na klopco (20 cm, 6 min, 60-65 % največje frekvence srčnega utripa), (ii) nizko-intenzivno stopanje z dodanimi poskoki (6 ponovitev x 3 serije, 2,5 min odmor med serijami), (iii) nizko intenzivno stopanje z dodanimi izometričnimi iztegi nog na sankah (3 ponovitve, 5 do 8 s, odmor med ponovitvami 2,5 min). Rezultati so pokazali, da ogrevanje z dodanimi poskoki izboljša kakovost tandemske stoje 12 minut po ogrevanju, medtem ko dodana izometrična naprezanja povzročijo poslabšanje ravnotežja. Poskoke kot potenciacijsko aktivnost je smiselno vključiti pred vadbo ravnotežja, še posebej takrat, ko za ogrevanje izvajamo nizkointenzivne ciklične obremenitveTEXTznanstveno časopisjejournalsSlovenian National E-content AggregatorNational and University Library of SloveniaUniverza v Ljubljani, Fakulteta za šport