Naslov
EFFECTS OF UNILATERAL STRENGTH TRAINING ON CONTRALATERAL ONE - LEGGED STANDING BALANCE

Autori
Josipa Bradić ; Erol Kovačević ; Asim Bradić

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
8th International Conference on Strength Training / Håvard Wiig, Truls Raastad, Jostein Hallén, Jens Bojsen-Møller, Gøran Paulsen, Olivier Seynnes, Tron Krosshaug, Tormod Skogstad Nilsen, Ina Garthe - Oslo, 2012, 191-192

Skup
8􀇦􀇚 INTERNATIONAL CONFERENCE ON STRENGTH TRAINING

Mjesto i datum
Oslo, Norveška, 24.10.2012. - 28.10.2012

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Strength training; ipsilateral limb; contralateral limb; physically active women; contralateral one-legged standing balance

Sažetak
Obtained results significantly extend our perception about cross education phenomenon, or phenomenon of contralateral strength training effects. Contralateral training effects are relevant and these results could provide the implementation potential in many areas, especially in the field of physical medicine, rehabilitation, prevention of falls and injuries. The results of this study show that unilateral concentric strengths training of lower extremities improve balance of ipsilateral leg for 35 %, and contralateral for more than 15 %. The results of this study are in accordance with the study from 2011. [9]. These results suggest that contralateral training with unilateral hip isokinetic exercise increases one-legged standing balance of the contralateral limb. In our research were trained muscles that surround the joints relevant for one-legged standing balance. For example, one of important postural strategies in balance preservation is so-called Strategy of ankle joint [5]. According to this Strategy, human body is rotating around ankle joint by principle of the reverse pendulum, therefore ; it stands to a reason, that training of strengths muscles that surround ankle joints significantly improves stability and upright standing balance. The results of t-test for dependent samples showed that there is no statistically significant difference in BALANCE test of dominant and undominant leg between groups in Pre testing. For this reason, statistically significant changes in the ipsilateral and contralateral single leg balance between Pre and Post testing (Table 1.) attributed to the effects of training program. Subjects. 30 young, healthy, and physically active women (age: 21 yrs., mass: 60 kg, height: 67 cm, percent body fat: 26%) were randomly allocated to one of two groups: 1) control group (n=15), 2) experimental group (n=15). Training program. The training program consisted of unilateral concentric contractions of knee extensors and flexors, and ankle dorsi and plantar flexors and it was performed on isokinetic dynamometer (Biodex System 3, Biodex Corporation, Shirley, NY). The training velocity was 60°/s for knee, and 30°/s for ankle. Over the 4-week program the training volume increased progressively with the increase in sets number, starting first with two (first training), then three (from second to fifth training) and finally with four sets (from 6th to 12th training). Testing procedure. Each participant was tested on two occasions: 1) prior to commencement of training (Pre), and 2) one week after the completion of the 4-week training period (Post). The testing procedure included one-legged standing balance measurement, followed by leg strength (i.e. muscle function) measurement. One - legged standing balance. Single-limb postural stability was assessed on a Biodex Stability System, level 5 (Biodex, Shirley, New York, USA). BSS was used in a numerous of studies before (1, 13, 15, 16, 9). The measures of dynamic balance included overall stability index scores (OSI). The OSI represents the variance of foot-platform displacement in degrees from a level position, in all motions during a test. A high stability score indicates poor balance. Data analyses. Pre and Post training Means and SDs were calculated for ipsilateral (trained) and contralateral (untrained) one – legged standing balance in both group. T-test for independent (EXP – CON) and dependent (Pre-Post) samples was set at p < 0, 01.

Izvorni jezik
Engleski

Znanstvena područja
Pedagogija

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