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Muskelaktiveringsmönster i quadriceps i relation till dynamisk valgus vid ett drop-landingtest.: – En studie gjord på kvinnliga fotbollsspelare
Umeå University, Faculty of Medicine, Department of Community Medicine and Rehabilitation, Sports medicine.
2018 (Swedish)Independent thesis Basic level (degree of Bachelor), 180 HE creditsStudent thesisAlternative title
Muscle activation pattern in quadriceps in relation to dynamic valgus in a drop landing test. : - A study on female soccer players (English)
Abstract [sv]

Både biomekaniska och neuromuskulära faktorer hos kvinnliga fotbollsspelare har visat sig påverka risken att drabbas av främre korsbandsskador. Obalanserad muskelaktivering kring knäleden har visat sig påverka ledstabiliteten. Syftet med studien var därför att undersöka sambandet mellan muskelaktiveringen i vastus medialis och vastus lateralis i relation till valgusvinkel hos fotbollsspelande kvinnor vid ett drop-landingtest. Studien gjordes i samarbete med det finska företaget Fibrux OY, som har utvecklat en bärbar sEMG-apparatur. I studien deltog 15 kvinnliga fotbollsspelare som under en drop-landing bar sEMG-elektroder på vastus medialis och vastus lateralis samtidigt som rörelsen filmades framifrån för att möjliggöra 2D analys av valgusvinkel. Resultaten visar en tendens till samband mellan muskelaktiveringsgrad och valgusvinkel (r=0,51) (p>0,05) samt ett svagt samband mellan muskelaktiveringsordning och valgusvinkel (r=0,32) (p>0,05). Det svaga sambandet gör att det inte går att utesluta att det är andra muskler kring knäleden som har större inverkan på ledstabiliteten. Framtida forskning bör utföras på en större population och rikta sig på prospektiv epidemiologisk forskning eftersom det är den enda studiedesignen som avslöjar vilka variabler som kan associeras med risken att drabbas av en knäskada.

Abstract [en]

Both biomechanical and neuromuscular factors affect the risk of suffering an ACL rupture among female soccer players. Unbalanced muscle activation around the knee has been found to affect the joint stability. The aim of this study was therefor to investigate the muscle activation in vastus medialis and vastus lateralis in relation to dynamic valgus among female soccer players. The study was conducted in cooperation with the Finnish company Fibrux OY, who has developed a portable sEMG testing equipment. The participants consisted of 15 female soccer players who were tested with sEMG electrodes on vastus medialis and vastus lateralis during a drop-landingtest that was filmed to enable 2D analysis of valgus angle. The results show a tendency to correlation between the activation ratio and valgus(r=0,51) (p>0,05), and between activation delay in vastus medialis and valgus (r=0,32) (p>0,05). But both correlations lack significance. The results could be explained by that there might be other muscles around the knee at that affects the joint stability even more than vastus lateralis and medialis do. Future studies should be conducted with larger sample size and focus on prospective epidemiological research because that is the only study design that reveals what variables can be associated with the risk of suffering a knee injury.

 

Place, publisher, year, edition, pages
2018.
Keywords [en]
ACL injury, EMG, soccer, dynamic valgus
Keywords [sv]
Korsbandsskada, ACL, EMG, fotboll, dynamisk valgus
National Category
Sport and Fitness Sciences
Identifiers
URN: urn:nbn:se:umu:diva-149473OAI: oai:DiVA.org:umu-149473DiVA, id: diva2:1222065
External cooperation
Fotbollslag Kraft FF Närpes, Finland; EMG-utrustning Fibrux OY, Finland
Educational program
Physical Trainer Pogramme
Available from: 2018-06-20 Created: 2018-06-20

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