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Bilateral synergies in foot force production tasks
Nejc Šarabon, Goran Marković, Pavle Mikulić, Mark L. Latash, 2013, izvirni znanstveni članek

Opis: We analysed the effects of task symmetry during bilateral accurate force production tasks performed by the two feet. In particular, we tested a hypothesis that bilateral deficit would lead to higher indices of synergies defined as co-varied adjustments in the two forces across trials that reduced total force variability. The subjects produced steady-state force followed by a quick force pulse into the target. The two feet could be acting both into plantar flexion and into dorsiflexion (symmetrical tasks), or in opposite directions (asymmetrical task). We used the framework of the uncontrolled manifold hypothesis to quantify two variance components, one of which did not change total force (VUCM), while the other did (VORT). Synergy indices during the asymmetrical task were higher than in either symmetrical task. The difference was due to higher VUCM (compared to the symmetrical plantar flexion task) or lower VORT (compared to the symmetrical dorsiflexion task). The synergy index showed a drop (anticipatory synergy adjustment, ASA) starting 100150 ms prior to the force pulse initiation. The ASA tended to be shorter and of a smaller magnitude for the asymmetrical task. This is the first demonstration of bilateral synergies during accurate force production by the legs. We conclude that bilateral deficit has no or weak effects on two-leg synergies. The results fit the earlier introduced scheme with two groups of neural variables defining average performance of a redundant system and patterns of co-variation among its elemental variables, respectively
Najdeno v: ključnih besedah
Povzetek najdenega: Zadetek v naslovu
Ključne besede: kinesiology, force, synergy, legs, bilateral deficit, symmetry
Objavljeno: 15.10.2013; Ogledov: 1712; Prenosov: 66
URL Polno besedilo (0,00 KB)
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Differences in the knee torque between high- and low-bar back squat techniques
Uroš Marušič, Mitja Gerževič, Matej Supej, Janez Logar, Matej Kleva, 2014, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: ...inverse dynamics, force, kinematics, kinetics, weightlifting, squat, knee, powerlifting, ...
Ključne besede: inverse dynamics, force, kinematics, kinetics, weightlifting, squat, knee, powerlifting
Objavljeno: 15.10.2015; Ogledov: 1560; Prenosov: 29
URL Polno besedilo (0,00 KB)

Adhesion force mapping on wood by atomic force microscopy: influence of surface roughness and tip geometry
X. Jin, Bohumil Kasal, 2016, izvirni znanstveni članek

Najdeno v: ključnih besedah
Povzetek najdenega: Zadetek v naslovu
Ključne besede: atomic force microscopy, wood, natural fibre, surface roughness, adhesion force measurement, tip geometry
Objavljeno: 19.11.2018; Ogledov: 199; Prenosov: 46
URL Polno besedilo (0,00 KB)

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