Diferenças na cinemática entre dois tipos de aterrissagens em atletas masculinos de voleibol

Leporace, Gustavo; Praxedes, Jomilto; Fonseca, Rodrigo; Chagas, Daniel das Virgens; Júnior, João de Deus Brandão; Rodrigues, Christian Fragoas Fernandez; Pereira, Geraldo; Batista, Luiz Alberto

doi:10.5007/1980-0037.2010v12n6p464

Cited by 3 publications

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References 26 publications

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“…Thus, it is expected that the quadriceps activity is higher in the former than in the latter type of landing. The lack of statistical differences in this study may be related to different heights reached by the sample used in this study in the vertical jump in each landing situation presented by Leporace et al (20) . Our population reached higher vertical dislocation in the jump with subsequent doubleleg landing.…”

Section: Discussionmentioning

confidence: 80%

Ativação muscular do quadril e do joelho em duas aterrissagens realizadas por atletas do sexo masculino

Leporace

Praxedes

Pereira

et al. 2011

Rev Bras Med Esporte

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Objective: To compare the myoelectric activity before and after ground contact between single-leg (SL) and double-leg (DL) landings in male athletes. Participants: Fifteen male volleyball athletes without signs and symptoms of lesions in the lower extremities, with a minimum of three years experience in the sport (13 ± 1 years, 1.70 ± 0.12 m, 60 ± 12 kg). Measurements: Participants performed two vertical jumps, landing unilaterally and bilaterally. The myoelectric activity of the rectus femoris (RF), biceps femoris (BF), hip adductors (HA) and the BF/RF ratio were compared between the two landings and between the phases characterized by 100ms before (PRE) and after 100 ms (POST) ground contactusing ANOVA two-way test with post hoc test of Bonferroni (α = 5%). Results: In both landings activation of RF was higher in the POST in relation to the PRE (p <0.0001). Comparing the landings in the same phase statistical differences (p = 0.2212) were not found. Although the BF did not present significant differences between the PRE and POST in each landing (p = 0.2321), its activation was higher in SL (p = 0.0051). The HA showed greater activation in the POST during the SL (p = 0.0013), however there were no differences when comparing the two landings (p = 0.9233). The BF/RF ratio was higher in both landings during PRE (p = 0.0012). Nevertheless, no differences between the landings (p = 0.7037) were found. Conclusion: The results suggest that each muscle has a different role during landing tasks in men. While RF has the main function to decelerate the knee and the downward movement, characterized by increased activation in the POST, BF seems to attenuate the loads on the knee in activities of higher impact, staying more active throughout the cycle in the SL. The increased activation of HA after ground contact in the SL highlights the importance of core region in stabilizing the pelvis in situations of great instability. Further studies are needed to determine the effects of muscle activation at the imposition of mechanical load on the knee that are potentially harmful to male athletes.

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Section: Discussionmentioning

confidence: 80%