Primerjava različnih protokolov inercijske vadbe za moč nog

doktorska disertacija

Darjan Spudić (Author), Igor Štirn (Mentor), Primož Pori (Co-mentor)

Abstract

Namen randomizirane kontrolirane raziskave na študentih Fakultete za šport je bil preveriti učinke dveh osemtedenskih protokolov inercijske vadbe za moč nog na mehanske in elektromiografske (EMG) spremenljivke gibalnih testov ter arhitekturo mišice vastus lateralis (VL). Protokola vadbe sta se razlikovala v velikosti inercijskega bremena, določenega iz odnosa sila-hitrost-moč (F-v-P) pri počepanju na inercijski napravi. Skupina Popt (n = 16) je vadila z bremenom, s katerim je proizvedla največjo moč (P), in skupina P70 (n = 18) z bremenom 70 % P. Kontrolna (K) skupina (n = 13) vadbe ni izvajala. Z analizo variance z mešanim načrtom (čas [pred, po], skupina [K, Popt in P70]) smo odkrili različne spremembe med skupinami v a) največji hoteni izometrični kontrakciji pri iztegu noge v nožni preši, b) velikosti prirastka sile, sili (F) in P odriva pri skoku iz polčepa, c) višini skoka, F in P odriva ter P zaviranja pri skoku z nasprotnim gibanjem, d) vseh spremenljivkah odnosa F-v-P pri počepanju na inercijski napravi v koncentričnem delu počepa in pri največji teoretični sili (F0) v ekscentričnem delu počepa, e) pri največji teoretični P in največji teoretični hitrosti pri skokih z bremeni ter e) debelini in penacijskem kotu mišice VL (vse p < 0,05). Skupina P70 je v večji meri izboljšala večino mehanskih spremenljivk, vendar kljub temu med vadbenima skupinama nismo odkrili razlik (p > 0,05). Počepanje na inercijski napravi z velikim bremenom (P70) povzroči izboljšanje F0 na odnosu F-v-P pri počepanju na inercijski napravi in, nasprotno, izboljšanje največje teoretične hitrosti na odnosu F-v-P pri skokih z bremeni. Izboljšanje mehanskih spremenljivk v obeh skupinah lahko v večji meri pojasnimo s povečanjem debeline mišice VL in ne s spremembami v delovanju živčnih mehanizmov.

Keywords

izoinercija;sila;hitrost;moč;elektromiografija;trening;odrivna moč;meritve;testi;študenti;Fakulteta za šport;

Data

Language:	Slovenian
Year of publishing:	2022
Typology:	2.08 - Doctoral Dissertation
Organization:	UL FŠ - Faculty of Sport
Publisher:	[D. Spudić]
UDC:	796.015.52:611.98-057.875(043.3)
COBISS:	120008707
Views:	21
Downloads:	9
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Comparison of different flywheel resistance exercise protocols for lower extremity strength and power
Secondary abstract:	The aim of the randomized controlled study, which included physical education students, was to investigate the mechanical and electromiographic (EMG) outcomes of motor tests and vastus lateralis (VL) architecture after eight weeks of lower extremity resistance training with different flywheel loads (FW). Loads were individually determined based on Force-velocity-Power (F-v-P) characteristics during FW squats. The Popt group (n = 16) performed squats with the FW load that maximazed power (P) output and P70 group (n = 18) with the load that corresponded to 70% of maximal theoretical P (Pmax). The control group (C; n = 13) received no intervention. Mixed model analysis of variance (time [pre, post], factor group [C, Popt, P70]) revealed different changes between groups in a) maximal voluntary isometric contraction during knee extension, b) squat jump push-off rate of force development, force (F), and P, c) countermovement jump (CMJ) height, push-off F, P, and braking P, (d) all F-v-P outcomes in the concentric phase of FW squats and the maximal theoretical force (F0) in the eccentric phase of the FW squats, (d) the maximal theoretical velocity (v0) and Pmax derived from loaded CMJ F-v-P profile, and finally e) the VL muscle thickness and the pennation angle (all p < 0.05). There was a trend toward higher improvements in the mechanical variables in the P70 group; nevertheless, we found no differences in the adaptations between the two training groups (p > 0.05). Training with higher inertial load (P70) resulted in improvements of F0 in FW squats and conversely in improvements of v0 in loaded CMJ. The improvements in mechanical variables can be explained to a greater extent by the adjustment in VL muscle thickness than by the neural activation enhancement.
Secondary keywords:	isoinertia;force;velocity;power;electromiography;training;jumping performance;graduation thesis;Noga;Disertacije;Moč;Trening;
Type (COBISS):	Doctoral dissertation
Study programme:	0
Embargo end date (OpenAIRE):	1970-01-01
Thesis comment:	Univ. v Ljubljani, Fak. za šport
Pages:	XI, 173 f.
ID:	16326960