The size of asymmetry in relation to the strength and speed-strength indices of lower extremities in alpine skiers
Journal Title: Antropomotoryka. Journal of Kinesiology and Exercise Sciences - Year 2012, Vol 22, Issue 58
Abstract
[b]Introduction.[/b] The phenomenon of functional asymmetry in sports has significant influence on performance in sports. In individual cases, especially in those sports disciplines that are highly symmetric, functional asymmetry may hamper the achievement of success. In addition, significant asymmetry may become a foundation for numerous injuries.[b]Aim of the study.[/b] The aim of the study was to examine the level of functional asymmetry of the lower limbs in alpine skiers.[b]Material and methods.[/b] Three adolescent girls and eight adolescent boys participated in the study. During the tests, the level of the asymmetry of participants’ lower extremities was assessed while performing motor tasks that required use of fitness abilities. The following indicators were studied: maximum force and the relative force developed under isometric contraction (knee joint and hip joint extensors) and kinematic indicators describing a countermovement jump (CMJ) on the force platform. The results for dominant and non-dominant limbs were analyzed separately.[b]Results.[/b] In most the subjects, the asymmetry coefficient was around 10% or exceeded this value. The direction of asymmetry points to the stronger left knee extensor muscle. Individuals with knee extensors that have higher asymmertry can be characterized by lower asymmetry of the hip extensors. Analysis of the mean values indicates significant differences between the asymmetry coefficients determined for the hip joints and the absence of such differences for the knee joints. Analysis of the jump results reveals symmetry index (SI) values at the level of 20% or above, thus indicating significant asymmetry. The direction of the asymmetry confirms the dominance of the left lower limb.[b]Conclusions.[/b] A significant asymmetry of strength abilities is characteristic for young alpine skiers. This could become an obstacle for their further development, but it could also give direction for further actions focused on achieving symmetry.
Authors and Affiliations
Przemysław Bujas, Dariusz Tchórzewski, Janusz Jaworski
Keywords
Related Articles
- EP ID EP60351
- DOI -
- Views 113
- Downloads 0
A scientific evening with N.A. Bernstein, A. Einstein, S. Hawking and D.R. Hofstadter
In the presented paper, the author tries to place motor control within the general structure of contemporary science. By its nature, motor control is highly abstract and cannot be supported by empirical findings to such...
Analiza wskaźników wagowo-wzrostowych pilotów samolotów wojskowych i cywilnych w Polsce w latach 1992-2002
Artykuł zawiera analizę wymiarów morfologicznych wybranej grupy pilotów wojskowych i cywilnych (n=9811). Uzyskany materiał posłużył do obliczenia wskaźników wagowo - wzrostowych. Analiza statystyczna wskaźników Rohrera i...
The influence of plyometrics training on the maximal power of the lower limbs in basketball players aged 16–18
[b]Aim of the work. [/b]The study was aimed at assessing the influence of plyometric training on explosive strength development dynamics in running and jumping among basketball players, since basketball is a sport discip...
Badanie wpływu zajęć z wychowania fizycznego na wielkość wskaźnika BMI uczniów szkół pdstawowych w Ahwazie
[b]Wprowadzenie[/b]. W alarmującym tempie nasila się otyłość wśród dzieci. Aby przeciwdziałać temu zjawisku, wiele samorządów uznaje za priorytet promocję kultury fizycznej w szkołach. Zamieszczony w niniejszym artykule...
Na tropach bredni i banałów w naukach o kulturze fizycznej na poziomie habilitacji
W przedłożonym niżej materiale cytuje się fragmenty z prac habilitacyjnych autorów wywodzących się z różnych środowisk w Polsce. Cytaty te przygotowano w nadziei zwrócenia uwagi na symptomy zagrożeń dla nauk o kulturze f...