Gender differences in knee kinematics and muscle activity during single limb drop landing

Nagano, Yuichiro; Ida, Hirofumi; Akai, Masami; Fukubayashi, Toru

doi:10.1016/j.knee.2006.11.008

Cited by 117 publications

(98 citation statements)

References 34 publications

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“…The rectus femoris presented increase in its activation in the pre-contact phase for the post-contact phase, as reported in other studies for other quadriceps muscles (17,18) and for the rectus femoris itself (9,18) . These findings seem to be related to the knee joint function, more specifically through the eccentric contraction of the quadriceps in absorbing the energy generated by the forces ground reaction (19) and, consequently, stop the movement.…”

Section: Discussionsupporting

confidence: 88%

“…Excessive quadriceps activation with no sufficient activation of the hamstrings muscles increases the tension in the ACL (11) , constituting in a possible risk factor for injuries in this ligament (23) . Decrease in the values after landing demonstrates increase of activation of the rectus femoris with more magnitude than presented by the biceps femoris, which is according to the literature (9,18) . Nevertheless, an important factor was the absence of differences between the two types of landing.…”

Section: Discussionsupporting

confidence: 68%

“…Nevertheless, an important factor was the absence of differences between the two types of landing. Concerning gender comparison, the studies demonstrated that women present lower BF/RF ratio after contact with the ground (9,17,18) , which is usually called quadriceps dominance. However, in the present study, differences between the two types of landing have not been found, which suggests that in order to attenuate the articular stress men present different strategies of muscular activation to keep the BF/ RF ratio constant even between motor conducts with different mechanical stress.…”

Section: Discussionmentioning

confidence: 99%

“…Subsequently, each athlete performed three landings with one lower limb and three landings with the two lower limbs for the myoelectric activity (EMG). Data collection was performed in the dominant lower limb (7,9) . The jumps were randomly performed to minimize the possible fatigue or learning process effects.…”

Section: Methodsmentioning

confidence: 99%

“…However, the sample used in this study was composed only of women. It is known that women and men are different about the myoelectric activation in landings, making it impossible hence to generalize the results (8,9) . Pappas et al (7) examined the effects of the type of jump, namely single-leg or double-leg, and the sex in kinetic and kinematic variables, besides assessing the muscular activity of the rectus femoris, hamstrings and lateral gastrocnemius when the knee was at 40º of flexion.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionsupporting

confidence: 88%

Section: Discussionsupporting

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

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

View full text Add to dashboard Cite

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The intercondylar fossa—A narrative review

2021

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The intercondylar fossa ("intercondylar notch," IN) is a groove at the distal end of the femur, housing important stabilizing structures: cruciate ligaments and meniscofemoral ligaments. As the risk for injury to these structures correlates with changes to the IN, exact knowledge of its morphology, possible physiological and pathological changes and different approaches for evaluating it are important. The divergent ways of assessing the IN and the corresponding measurement methods have led to various descriptions of its possible shapes. Ridges at the medial and lateral wall are considered clinically important because they can help with orientation during arthroscopy, whereas ridges at the osteochondral border could affect the risk of ligament injury. Changes related to aging and sex differences have been documented, further emphasizing the importance of individual assessment of the knee joint. Overall, it is of the utmost importance to remember the interactions between the osseous housing and the structures within.

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