20.500.12556/RUL-180530 Acute effects of fast eccentric contractions with different load on the postactivation potentiation Akutni učinki hitrih ekscentričnih kontrakcij z različno obremenitvijo na postaktivacijsko potenciranje Background: This study aimed to investigate the acute effects of fast eccentric contractions with different load on the postactivation potentiation (PAP). Methods: Potentiation was performed using 3 sets of 3 repetitions with dynamic contractions (EC90%) at 90% of one repetition maximum (1RM), fast eccentric contractions at 60% (ECC60%), and 40% (ECC40%) 1RM on a sample of 20 students. The procedure was carried out in four sessions with a 7-day rest between sessions. Anthropometric measurements and 1RM assessment using the barbell squat on the Smith machine were conducted in the first session. Acute PAP effects were assessed based on kinematic parameters (h - maximal jump height) using pretest and posttest Countermovement Jump (CMJ) tests in the second, third, and fourth sessions. The rest period between the potentiation stimulus and CMJ was 6 minutes for all conditions. Results: Repeated measures ANOVA showed significant differences in jump height after all three types of potentiation (p < .001). Bonferroni post-hoc analysis revealed significant differences between EC90% (2.81 ± 1.08 cm) and ECC60% (2.45 ± 0.8 cm) potentiation (p < .005). Additionally, jump height after EC90% and ECC60% was significantly higher compared to ECC40% (1 ± 0.3 cm). Conclusions: The results suggest that dynamic loads of 90% 1RM, along with 60% and 40% via fast eccentric contractions, can be used for acute increases in CMJ height after 6 minutes of rest. Furthermore, potentiation with fast eccentric contractions and moderate load shows similar effects on CMJ height as dynamic submaximal loads, a valuable finding for strength and conditioning coaches. Ozadje: Namen te študije je bil preučiti akutne učinke hitrih ekscentričnih kontrakcij z različnimi obremenitvami na postaktivacijsko potenciranje (PAP). Metode: Potenciranje je bilo izvedeno s 3 serijami po 3 ponovitve z dinamičnimi kontrakcijami (EC90%) pri 90 % enega maksimalnega ponavljanja (1RM), hitrimi ekscentričnimi kontrakcijami pri 60 % (ECC60%) in 40 % (ECC40%) 1RM na vzorcu 20 študentov. Postopek je bil izveden v štirih sejah s 7-dnevnim premorom med njimi. V prvi seji so bile opravljene antropometrične meritve in ocena 1RM pri počepu s palico na Smithovi napravi. Akutni učinki PAP so bili ocenjeni na podlagi kinematičnih parametrov (h – maksimalna višina skoka) s predtestnimi in potestnimi testi skoka z uporabo protokola Countermovement Jump (CMJ) v drugi, tretji in četrti seji. Odmor med potencirajočim dražljajem in CMJ je bil za vse pogoje 6 minut. Rezultati: Ponovljena analiza variance (ANOVA) je pokazala statistično značilne razlike v višini skoka po vseh treh vrstah potenciranja (p < .001). Bonferronijeva post-hoc analiza je razkrila pomembne razlike med potenciranjem EC90% (2.81 ± 1.08 cm) in ECC60% (2.45 ± 0.8 cm) (p < .005). Poleg tega je bila višina skoka po EC90% in ECC60% značilno višja v primerjavi z ECC40% (1 ± 0.3 cm). Zaključki: Rezultati kažejo, da lahko dinamične obremenitve pri 90 % 1RM ter hitre ekscentrične kontrakcije pri 60 % in 40 % 1RM povzročijo akutno povečanje višine CMJ po 6-minutnem odmoru. Nadalje je potenciranje s hitrimi ekscentričnimi kontrakcijami in zmerno obremenitvijo pokazalo podobne učinke na višino CMJ kot dinamične submaksimalne obremenitve, kar je dragocena ugotovitev za trenerje moči in kondicije. sport PAP fast eccentric contraction explosive strength CMJ OptoGait šport PAP hitra ekscentrična kontrakcija eksplozivna moč CMJ OptoGait true false true Angleški jezik Slovenski jezik Članek v reviji 2026-03-11 08:59:52 2026-03-11 08:59:53 2026-03-26 08:35:56 0000-00-00 00:00:00 2025 0 0 Str. 34-50 no. 2 Vol. 31 2025 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 796.01 1318-2269 10.52165/kinsi.31.2.34-50 254358787 03_Zlojutro_Final_180530.pdf 03_Zlojutro_Final_180530.pdf 1 B6E68F00D3BC6546DED123560198C9A6 f9acff47778bdab0f4ff7c38e12c6993bfd886e25cfcf4d02580b213a25eb144 ea5f2eec-1d59-11f1-b0ab-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=230125 https://journals.uni-lj.si/kinsi/article/view/22060 0 dc81ea2a-1d1f-11f1-a1ba-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=229980 Fakulteta za šport Kinesiologia Slovenica 0 0 0