Differences in take-off leg kinetics between horizontal and vertical single-leg rebound jumps

Kariyama, Yasushi; Hobara, Hiroaki; Zushi, Koji

doi:10.1080/14763141.2016.1216160

Cited by 19 publications

(33 citation statements)

References 30 publications

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“…With regard to the correlations of the Bosco test, it was observed that the performance on this test correlated moderately-to-largely with torso lateral flexors muscle endurance. This observation was in agreement with research showing that torso lateral flexors had substantial potentials as stabilizers and energy generators during jumps [34] and played an important role in single-leg jumps independently of vertical or horizontal direction [35].…”

Section: Discussionsupporting

confidence: 92%

Core Stability and Symmetry of Youth Female Volleyball Players: A Pilot Study on Anthropometric and Physiological Correlates

Papadopoulou

Zorzou²,

Drikos

et al. 2020

Symmetry

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The aim of the present study was to examine the variation in core stability and symmetry of youth female volleyball players by age, and its relationship with anthropometric characteristics, the 30 s Wingate anaerobic test (WAnT), and the 30 s Bosco test. Female volleyball players (n = 24, age 13.9 ± 1.9 years, mean ± standard deviation) performed a series of anthropometric, core stability tests (isometric muscle endurance of torso flexors, extensors, and right and left lateral bridge), WAnT (peak power, mean power, Pmean, and fatigue index, FI) and Bosco test (Pmean). Flexors-to-extensors ratio and right-to-left lateral bridge ratio were also calculated. Participants were grouped into younger (n = 12, 12.3 ± 1.2 years) or older than 14 years (n = 12, 15.4 ± 1.0 years), and into normal (flexors-to-extensors ratio < 1; n = 17) or abnormal flexors-to-extensors ratio (≥1; n = 7). The older age group was heavier (+11.3 kg, mean difference; 95% CI, 2.0, 20.6) and with higher body mass index (+2.8 kg m−2; 95% CI, 0.4, 5.1) than the younger age group. The group with abnormal flexors/extensors had larger flexors muscle endurance (+77.4 s; 95% CI, 41.8, 113.0) and higher flexors/extensors ratio (+0.85; 95% CI, 0.61, 1.10) than the normal group. Body fat percentage (BF) correlated moderately-to-largely with flexors (r = −0.44, p = 0.033), extensors (r = −0.51, p = 0.011), and left lateral bridge (r = −0.45, p = 0.027); WAnT Pmean moderately-to-largely with right (r = 0.46, p = 0.027) and left lateral bridge (r = 0.55, p = 0.006); FI moderately-to-largely with right (r = −0.45, p = 0.031) and left lateral bridge (r = −0.67, p < 0.001), and right/left ratio (r = 0.42, p = 0.046); Bosco Pmean correlated moderately-to-largely with right (r = 0.48, p = 0.020) and left lateral bridge (r = 0.67, p = 0.001). A stepwise regression analysis indicated FI and BF as the most frequent predictors of core stability. The findings of the present study suggested that increased core stability was related to decreased BF and increased anaerobic capacity. A potential misbalance between torso flexors and extensors might be attributed to bidirectional variations (either high or low scores) of flexors muscle endurance rather than decreased extensors muscle endurance.

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Section: Discussionsupporting

confidence: 92%

Core Stability and Symmetry of Youth Female Volleyball Players: A Pilot Study on Anthropometric and Physiological Correlates

Papadopoulou

Zorzou²,

Drikos

et al. 2020

Symmetry

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“…The plyometric training outcome is influenced by the exerted joint torques and power in the lower extremities [31,32,36]. One of the most important training outcomes in the horizontal jump is the jump distance, which is determined by the joint kinetics of the stance leg [21]. The jump distance per step during bounding exercises from the standing position increases with an increasing number of steps (until around the fifth or seventh step) [21].…”

Section: Introductionmentioning

confidence: 99%

“…One of the most important training outcomes in the horizontal jump is the jump distance, which is determined by the joint kinetics of the stance leg [21]. The jump distance per step during bounding exercises from the standing position increases with an increasing number of steps (until around the fifth or seventh step) [21]. From the first to third steps in the bounding exercise, propulsive (horizontal) impulses of ground reaction forces (GRFs) are crucial for increasing horizontal velocity (acceleration steps).…”

Section: Introductionmentioning

confidence: 99%

“…The biomechanical characteristics of bounding exercises have been demonstrated by GRF, kinematics and electromyography [2,17,23]. Although one study only reported joint kinetics during bounding exercises [21], its results were obtained at a constantvelocity step, not during acceleration steps. Thus, little is known about how the joint kinetics of the stance leg vary in accordance with successive steps taken during bounding exercises.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, the goal of this study was to examine the hypothesis that the joint kinetic variables of the stance leg during bounding exercises increase with an increasing number of steps from the standing position. Hip abduction torque and power are important for resisting the impact GRF and maintaining lateral balance while performing bounding at a constant velocity [21]. We therefore focused on the three-dimensional hip joint kinetics of the stance leg.…”

Section: Introductionmentioning

confidence: 99%

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The Effect of Increasing Jump Steps on Stance Leg Joint Kinetics in Bounding

2018

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Jump distance per step in bounding exercises from the standing position increases with increasing number of steps. We examined the hypothesis that the joint kinetic variables of the stance leg would also increase accordingly. Eleven male athletes (sprinters and jumpers) performed bounding exercise, starting from the double-leg standing posture, and covered the longest distance possible by performing a series of seven forward alternating single-leg jumps. Kinematic and kinetic data were calculated using the data by a motion capture system and force platforms. Hip extension joint work were decreased at third step (1: 1.07±0.22, 3: 0.45±0.15, 5: 0.47±0.14 J•kg; partial η: 0.86), and hip abduction joint power were increased (1: 7.53±3.29, 3: 13.50±4.44, 5: 21.37±9.93 W•kg; partial η: 0.58); the knee extension joint power were increased until the third step (1: 14.43±4.94, 3: 17.13±3.59, 5: 14.28±2.86 W•kg; partial η: 0.29), and ankle plantar flexion joint power increased (1: 34.14±5.33, 3: 37.46±4.45, 5: 40.11±5.66 W•kg; partial η: 0.53). These results contrast with our hypothesis, and indicate that increasing the jump distance during bounding exercises is not necessarily accompanied by increases in joint kinetics of stance leg. Moreover, changes in joint kinetics vary at different joints and anatomical axes.

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Hip Abductors and Lumbar Lateral Flexors act as Energy Generators in Running Single-leg Jumps

2018

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In humans, hip abductor and lumbar lateral flexor muscles are well-developed as side-to-side lumbopelvic stabilizers. We hypothesized that the hip abductors and lumbar lateral flexors act as energy generators during a running single-leg jump, although they are generally recognized as stabilizers. We collected kinematics and ground reaction force data in running single-leg jumps by 13 male high jumpers and calculated three-dimensional kinetic variables. Hip abduction and lumbosacral lateral flexion towards free leg side torques were exerted during almost the entire take-off phase, exerting positive power during the terminal 2/3 of the phase. The positive work of the hip abductors (1.08±0.30 J/kg) was as large as that of the ankle plantar-flexors, suggesting that the energy-generating potential of the hip abductors compares with that of the extensors of the stance-leg joints. The lumbosacral lateral flexors also performed positive work (0.36±0.18 J/kg), which was 47±25% of the knee extensors, albeit less than the extensors of the stance leg joints. The results implied that the hip abductors and lumbar lateral flexors have substantial potentials not only as stabilizers but also as energy generators and that they act as substantial energy generators during running single-leg jumps.

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Differences in take-off leg kinetics between horizontal and vertical single-leg rebound jumps

Cited by 19 publications

References 30 publications

Core Stability and Symmetry of Youth Female Volleyball Players: A Pilot Study on Anthropometric and Physiological Correlates

Core Stability and Symmetry of Youth Female Volleyball Players: A Pilot Study on Anthropometric and Physiological Correlates

The Effect of Increasing Jump Steps on Stance Leg Joint Kinetics in Bounding

Hip Abductors and Lumbar Lateral Flexors act as Energy Generators in Running Single-leg Jumps

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