Foot placement modifies kinematics and kinetics during drop jumping

Kovács, István; Tihanyi, József; DeVita, Paul; Rácz, L; Barrier, J; Hortobágyi, Tibor

doi:10.1097/00005768-199905000-00014

Cited by 122 publications

(83 citation statements)

References 15 publications

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“…[24][25][26] The foot position at initial contact is also believed to be important because landing with a heel-to-toe movement pattern (landing on heel of foot) results in significantly greater vertical ground-reaction force and rate of force development, external knee-and hip-flexion moment, and quadriceps activation than a forefoot landing movement pattern (landing on metatarsal heads; LESS-RT item 6). 27 Thus, jump-landing movement patterns consisting of decreased sagittal-plane joint flexion (decreased knee, hip, and trunk flexion) and a heel-to-toe landing pattern were thought to be high-risk movement patterns for noncontact ACL injury and were included as movement errors on the LESS-RT.…”

Section: Discussionmentioning

confidence: 99%

Reliability of the Landing Error Scoring System-Real Time, a Clinical Assessment Tool of Jump-Landing Biomechanics

Padua¹,

Boling²,

DiStefano³

et al. 2011

Journal of Sport Rehabilitation

108

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Context:There is a need for reliable clinical assessment tools that can be used to identify individuals who may be at risk for injury. The Landing Error Scoring System (LESS) is a reliable and valid clinical assessment tool that was developed to identify individuals at risk for lower extremity injuries. One limitation of this tool is that it cannot be assessed in real time and requires the use of video cameras.Objective:To determine the interrater reliability of a real-time version of the LESS, the LESS-RT.Design:Reliability study.Setting:Controlled research laboratory.Participants:43 healthy volunteers (24 women, 19 men) between the ages of 18 and 23.Intervention:The LESS-RT evaluates 10 jump-landing characteristics that may predispose an individual to lower extremity injuries. Two sets of raters used the LESS-RT to evaluate participants as they performed 4 trials of a jump-landing task.Main Outcome Measures:Intraclass correlation coefficient (ICC2,1) values for the final composite score of the LESS-RT were calculated to assess interrater reliability of the LESS-RT.Results:Interrater reliability (ICC2,1) for the LESS-RT ranged from .72 to .81 with standard error of measurements ranging from .69 to .79.Conclusions:The LESS-RT is a quick, easy, and reliable clinical assessment tool that may be used by clinicians to identify individuals who may be at risk for lower extremity injuries.

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Section: Discussionmentioning

confidence: 99%

Reliability of the Landing Error Scoring System-Real Time, a Clinical Assessment Tool of Jump-Landing Biomechanics

Padua¹,

Boling²,

DiStefano³

et al. 2011

Journal of Sport Rehabilitation

108

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show abstract

“…In this study, the author verified that 55% of attack landings and 57% of the defense landings are performed with symmetrical support from the two lower limbs (bipedal), as used in our research. However, the landing using oneleg support is described as a potential mechanism of sprain in the knees and ankle for volleyball athletes (14) . This aspect suggests the need to evaluate the electrical activity of the muscles studied also during the jump and the landing in one-leg support, and such aspect was not mentioned in this study.…”

Section: E Discussionmentioning

confidence: 99%

Influência da utilização da órtese de tornozelo durante atividades do voleibol: avaliação eletromiográfica

Cardoso

Guerino

Santos

et al. 2005

Rev Bras Med Esporte

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The ankle sprain is the most frequently found acute injury in volleyball. Aiming to prevent the occurrence of ankle injuries, prophylactic equipment as the bracing had been developed. This study had the purpose to evaluate the performance of the ankle muscles (tibialis anterior, peroneous longus, and medial and lateral gastrocnemius) by measuring the electrical activity in different volleyball activities (vertical jumping and lateral shuffling) with and without using ankle bracing. Nine young female volleyball athletes with ages ranging from 14 to 17 years (x: 15.8 ± 1.3) were evaluated, all of them without previous injuries in the dominant member. Maximal voluntary isometric contractions (MVIC) of each muscle was collected, and after that, the electromyographic activity in different situations with and without using the bracing, randomly. The bracing used had two lateral supports. The electromyographic signal was quantified by the root mean square (RMS), and normalized by the MVIC. Analysis of the variance with repeated measurement was used to verify the difference of the electric activity of the muscles involved in each activity, with and without using the bracing, with 5% (p < 0.05) significance level. It was identified a statistically significant difference in phase I of the jumping in favor of the tibialis anterior (p < 0.001) and in phase II in favor of the three flexors muscles (p < 0.001; p = 0.01; p = 0.003) in both situations, with and without using the bracing. As to the lateral jump activity, a significant difference was observed in the phase of braked in favor of the tibialis anterior and the lateral gastrocnemius (p = 0.013) in both situations. It was found no statistical difference among muscles of the two groups. Results suggest that using the ankle bracing cannot influence the electrical activity of the muscles studied during the vertical jumping and the lateral shuffling.

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“…Consequently, great part of the mechanical loads is absorbed by only one lower limb. Kovacs et al (2) proposed that the most common mechanism of knee injury in volleyball is the asymmetrical landing , when the lower limbs are in contact with the ground at different moments.…”

Section: Introductionmentioning

confidence: 99%

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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Foot placement modifies kinematics and kinetics during drop jumping

Abstract: Foot placement strategy modifies the individual joint contributions to the total power during drop jumping.

Cited by 122 publications

References 15 publications

Reliability of the Landing Error Scoring System-Real Time, a Clinical Assessment Tool of Jump-Landing Biomechanics

Reliability of the Landing Error Scoring System-Real Time, a Clinical Assessment Tool of Jump-Landing Biomechanics

Influência da utilização da órtese de tornozelo durante atividades do voleibol: avaliação eletromiográfica

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

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