O efeito de sprints repetidos com mudança de direção na assimetria entre membros de atletas de futebol americano
Introduction: Sports asymmetry arise from motor demand. Therefore, motor demand can influence the behaviour of asymmetry in fatigue. Purpose: Verify the effect of repeated-sprint with change-of-direction protocol on inter-limb asymmetry in American football athletes. Methods: Ten American footbal...
Na minha lista:
| Autor principal: | |
|---|---|
| Outros Autores: | |
| Formato: | Dissertação |
| Idioma: | pt_BR |
| Publicado em: |
Universidade Federal do Rio Grande do Norte
|
| Assuntos: | |
| Endereço do item: | https://repositorio.ufrn.br/handle/123456789/32829 |
| Tags: |
Adicionar Tag
Sem tags, seja o primeiro a adicionar uma tag!
|
| Resumo: | Introduction: Sports asymmetry arise from motor demand. Therefore, motor demand
can influence the behaviour of asymmetry in fatigue. Purpose: Verify the effect of
repeated-sprint with change-of-direction protocol on inter-limb asymmetry in American
football athletes. Methods: Ten American football athletes were recruited for study
participation. The participants realized a control (NFAT) and repeated-sprint with
change-of-direction (FAT) session. The Single-leg countermovement jump (SLCMJ)
was realized following the recommendations of countermovement jump, but the
impulsion carried out with a single-leg alternately. Knee extensors (PTE) and flexors
(PTF) peak of torque was evaluated from isokinetic concentric contraction with 60º/s
velocity. Asymmetry was calculated by the percentage difference between members.
Results: Dominant limb (DL) has more PTE (~18,26 N∙m) than non-dominant limb
(NDL) in NFAT, but no has significant difference post-FAT. PTF no has fatigue and
dominance limb effect (F(1,9)= 1,57; p= 0,242; η
2= 0,149). PTE and PTF asymmetry no
have significant difference post-FAT. DL have more SLCMJ performance (~1.34cm)
than NDL in NFAT, but no has significant difference post-fatigue. SLCMJ asymmetry
no have means statistical difference in NFAT and FAT conditions, besides no
correlation. Only SLCMJ asymmetry have variance homogeneity (p= 0.581), but no
measurement of study present showed reproducibility in FAT condition. Conclusion:
The protocol of repeated-sprints with change of direction fatigue promotes more
pronounced fatigue in the peak torque of knee extensors than in the peak torque of
knee flexors and the asymmetry seems to be affected in fatigue condition. |
|---|