Bilateral synergies in foot force production tasks

Šarabon, Nejc; Marković, Goran; Mikulić, Pavle; Latash, Mark L.

ENG

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Naslov:	Bilateral synergies in foot force production tasks
Avtorji:	ID Šarabon, Nejc (Avtor) ID Marković, Goran (Avtor) ID Mikulić, Pavle (Avtor) ID Latash, Mark L. (Avtor)
Datoteke:	http://link.springer.com/content/pdf/10.1007%2Fs00221-013-3494-4.pdf
Jezik:	Angleški jezik
Vrsta gradiva:	Delo ni kategorizirano
Tipologija:	1.01 - Izvirni znanstveni članek
Organizacija:	IAM - Inštitut Andrej Marušič
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
Ključne besede:	kinesiology, force, synergy, legs, bilateral deficit, symmetry
Leto izida:	2013
Št. strani:	str. 121-130
Številčenje:	Vol. 227, iss. 1
PID:	20.500.12556/RUP-2620
ISSN:	0014-4819
UDK:	796.012
COBISS.SI-ID:	2372051
Datum objave v RUP:	15.10.2013
Število ogledov:	25328
Število prenosov:	245
Metapodatki:
:	ŠARABON, Nejc, MARKOVIĆ, Goran, MIKULIĆ, Pavle in LATASH, Mark L., 2013, Bilateral synergies in foot force production tasks. [na spletu]. 2013. Vol. 227, no. 1, p. 121–130. [Dostopano 11 april 2025]. Pridobljeno s: http://link.springer.com/content/pdf/10.1007%2Fs00221-013-3494-4.pdf Kopiraj citat

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