Lower-Extremity Bilateral Differences During Step-Close and No-Step Countermovement Jumps With Concern for Gender

Lawson, Brooke R.; Stephens, Thomas M.; DeVoe, Dale; Reiser, Raoul F.

doi:10.1519/r-18265.1

Cited by 10 publications

(12 citation statements)

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“…In doing so, minimizing asymmetry may merely be a consequence of targeted training interventions which aim to address deficits in the weaker limb. With asymmetries evident across a range of team sports such as basketball [10][11][12], soccer [13] and volleyball [14,15], it is surprising that there are currently no clear conclusions about how inter-limb asymmetries affect athletic performance [9].…”

Section: Introductionmentioning

confidence: 99%

Inter-limb asymmetries are associated with decrements in physical performance in youth elite team sports athletes

et al. 2020

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Actually, there is scarce literature looking for the relationship between inter-limb asymmetries and performance in youth elite team sports. The main purpose of this cross-sectional study was to examine the relationships between inter-limb asymmetries and physical performance in youth elite team-sports players. A secondary objective was to evaluate the presence of between-sexes differences in inter-limb asymmetries in elite youth team sports players. Eighty-one young elite team-sports athletes (age: u-14 to u-18) performed the star excursion balance test in the anterior direction (SEBT ANT), a single leg vertical countermovement jump test (SLCMJ), the one leg hop test for distance (OLHT), a 30 m sprint test, and the V-cut test. Inter-limb asymmetries were calculated for SEBT ANT, SLCMJ and OLHT. Pearson r was used to analyse the relationships between inter-limb asymmetries and physical performance. Results showed significant (p < 0.05) but small (r = 0.26) relationships between SLCMJ asymmetries and 30 m sprint time for the total group. Significant negative correlations with small to moderate magnitude of correlation were also found between SLCMJ asymmetries and SLCMJ performance on the lowest performing limb for the total group (p < 0.05; r =-0.26), males (p < 0.01; r =-0.48) and females (p < 0.05; r =-0.30). Moreover, significant negative correlations with moderate and large magnitude were also present between OLHT asymmetries and OLHT performance on the lowest performing limb for the total group (p < 0.01; r =-0.44), males (p < 0.01; r =-0.56) and females (p < 0.01; r =-0.64). No correlations were observed between asymmetries and either the V-cut test or SEBT ANT performance. No correlation were observed between SEBT ANT asymmetries and physical performance. In addition, when comparing asymmetry values between sexes there were no significant differences in vertical (p = 0.06) and horizontal (p = 0.61) jumping tests. However, there were significant differences in asymmetry between sexes in the ANT SEBT (p = 0.04). In conclusion, the current study indicated that jumping asymmetries were

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Section: Introductionmentioning

confidence: 99%

Inter-limb asymmetries are associated with decrements in physical performance in youth elite team sports athletes

et al. 2020

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“…The relationship between strength and power asymmetry and injury risk or poor performance could be related to the inability of a weaker lower limb to produce and / or absorb the same amount of force that a stronger limb can. Previous research suggests that lower limb imbalances exist in cutting and pivoting sports such as basketball (Theoharopoulos and Tsitskaris, 2000), soccer (Rahnama et al, 2005) and volleyball (Lawson et al, 2006; Markou and Vagenas, 2006). Moreover, these imbalances have also been identified in activities that have no rapid changes of direction such as running and cycling (Carpes et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

Lower Limb Neuromuscular Asymmetry in Volleyball and Basketball Players

Fort-Vanmeerhaeghe

Gual

Romero-Rodríguez

et al. 2016

Journal of Human Kinetics

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The primary objective of the present study was to evaluate the agreement between the dominant leg (DL) (determined subjectively) and the stronger leg (SL) (determined via a functional test) in a group of basketball and volleyball players. The secondary objective was to calculate lower limb neuromuscular asymmetry when comparing the DL vs the non-dominant leg (NDL) and the SL vs the weaker (WL) leg in the whole group and when differentiating by sex. Seventy-nine male and female volleyball and basketball players (age: 23.7 ± 4.5 years) performed three single-leg vertical countermovement jumps (SLVCJ) on a contact mat. Vertical jump height and an inter-limb asymmetry index (ASI) were determined. Only 32 (40%) of the subjects had a concordance between the perception of their dominant leg and the limb reaching the highest jump height. Using the DL as the discriminating variable, significant (p<0.05) inter-limb differences were found in the total group of players. When comparing between sexes, significant differences (p<0.05) arose in the female group only. With regard to the WL vs. the SL, significant (p<0.05) differences were noted in the whole group and when stratified into males and females. The mean ASI ranged from 9.31% (males) to 12.84% (females) and from 10.49% (males) to 14.26% (females), when comparing the DL vs. the NDL and the SL vs. the WL, respectively. Subjective expression of leg dominance cannot be used as a predictor of limb jump performance. Vertical jump asymmetry of 10-15% exists and this can be considered as a reference value for male and female basketball and volleyball players.

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“…Additionally, when comparing between‐sex landing technique, individual anthropometry should be considered to ensure that any observed differences are not merely due to varying anthropometrics rather than sex (Mura et al., ). Despite potential explanations for differences in patellar tendon load, previous studies that compared the landing technique of male and female volleyball players did not match the participants for anthropometry (Salci et al., ; Lawson et al., ; Hughes et al., ). As body mass has been identified as a critical factor for developing patellar tendinopathy (Lian et al., , ), it remains unknown whether between‐sex differences in landing technique or patellar tendon loading may simply be a result of variations in anthropometry rather than sex‐specific factors per se .…”

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confidence: 99%

Variations in jump height explain the between‐sex difference in patellar tendon loading during landing

Janssen

Brown²,

Munro

et al. 2014

Scandinavian Med Sci Sports

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Patellar tendinopathy is the most common overuse knee injury in volleyball, with men reporting more than twice the injury prevalence than women. Although high patellar tendon loading is thought to be a causative factor of patellar tendinopathy, it is unknown whether between-sex variations in landing technique account for differences in patellar tendon loading. It was hypothesized that male volleyball players would display differences in landing technique and would generate higher patellar tendon loading than their female counterparts. The landing technique and patellar tendon loading of 20 male and 20 female volleyball players performing a lateral stop-jump block movement were collected. Independent t-tests were used to identify any between-sex differences in landing technique with the data grouped to account for differences in jump height and in anthropometry. Male volleyball players were taller and heavier, landed from a higher height, displayed differences in landing kinematics, generated a significantly greater knee extensor moment, and experienced higher patellar tendon loading than female players when all 40 participants were compared. However, when participants were matched on jump height, they generated similar patellar tendon loading, irrespective of their sex. These results imply that jump height is a more important determinant of patellar tendon loading than sex.

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Lower-Extremity Bilateral Differences During Step-Close and No-Step Countermovement Jumps With Concern for Gender

Cited by 10 publications

References 0 publications

Inter-limb asymmetries are associated with decrements in physical performance in youth elite team sports athletes

Inter-limb asymmetries are associated with decrements in physical performance in youth elite team sports athletes

Lower Limb Neuromuscular Asymmetry in Volleyball and Basketball Players

Variations in jump height explain the between‐sex difference in patellar tendon loading during landing

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