Optimal Drop Height in Prepubertal Boys Is Revealed by the Performance in Squat Jump

Bassa, Eleni; Adamopoulos, Ilias; Panoutsakopoulos, Vassilios; Xenofondos, Anthi; Yannakos, Athanasios; Galazoulas, Christos; Patikas, Dimitrios

doi:10.3390/sports11010001

Cited by 4 publications

(3 citation statements)

References 58 publications

(90 reference statements)

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“…This can be related to the increased BCM velocity at the instant of impact in the VDJ. This possibly resulted in higher stimulation of the neuromuscular system during the breaking phase to optimally regulate the power output and stiffness in the VDJ [45,63,64] compared to the HPRJ.…”

Section: Discussionmentioning

confidence: 99%

Reliability of a Pendulum Apparatus for the Execution of Plyometric Rebound Exercises and the Comparison of Their Biomechanical Parameters with Load-Matching Vertical Drop Jumps

Panoutsakopoulos

Kollias

2023

Biomechanics

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The inability to control the body center of mass (BCM) initial conditions, when executing plyometric exercises, comprises a restrictive factor to accurately compare jumps executed vertically and horizontally. The purpose of the study was to present a methodological approach for the examination of BCM initial conditions during vertical drop jumps (VDJ) and plyometric rebound jumps performed with a pendulum swing (HPRJ). A system consisting of two force plates was used for the evaluation of VDJ. A bifilar pendulum, equipped with a goniometer and accelerometer, was constructed for the evaluation of the HPRJ. Kinematic parameters from both jump modalities were obtained by means of videography (100 Hz). Thirty-eight physically active young males executed VDJ and HPRJ with identical BCM kinetic energy at the instant of impact (KEI). Results revealed that participants produced higher power and lower force outputs at HPRJ (p < 0.01). The rate of force development was larger in VDJ, while hip movement was less in HPRJ. The use of the presented methodology provided the means to reliably determine the exact BCM release height during the execution of the examined jumps. This provided an accurate determination of the amount of KEI, being the main parameter of calculating load during plyometric exercise.

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Section: Discussionmentioning

confidence: 99%

Reliability of a Pendulum Apparatus for the Execution of Plyometric Rebound Exercises and the Comparison of Their Biomechanical Parameters with Load-Matching Vertical Drop Jumps

Panoutsakopoulos

Kollias

2023

Biomechanics

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“…The first-time derivative of the recorded vertical GRF defined RFD, while P MAX was the peak value of the multiplication product of the vertical GRF by the vertical CoM velocity during the propulsive phase [ 17 ]. Based on h JUMP , the following vertical jump performance parameters were also calculated [ 35 , 36 ]: SSC gain (Equation (1)):

…”

Section: Methodsmentioning

confidence: 99%

Vertical Jump Kinetic Parameters on Sand and Rigid Surfaces in Young Female Volleyball Players with a Combined Background in Indoor and Beach Volleyball

Giatsis

Panoutsakopoulos

Frese

et al. 2023

JFMK

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Little is known about the differences in vertical jump biomechanics executed on rigid (RJS) and sand (SJS) surfaces in female indoor and beach volleyball players. Eleven young female beach volleyball players with a combined indoor and beach volleyball sport background performed squat jumps, countermovement jumps with and without an arm swing, and drop jumps from 40 cm on a RJS (force plate) and SJS (sand pit attached to the force plate). The results of the 2 (surface) × 4 (vertical jump test) repeated-measure ANOVA revealed a significant (p < 0.05) main effect of the surface and the vertical jump test on the jump height and time to achieve peak vertical body center of mass velocity. A significant (p < 0.05) main effect of the test, but not of the surface (p > 0.05), was observed for the other examined biomechanical parameters. The only significant (p < 0.05) jump height gain difference between RJS and SJS was observed for the utilization of the stretch-shortening cycle, which was higher in SJS (15.4%) compared to RJS (7.5%). In conclusion, as the testing was conducted during the beach volleyball competitive season, the examined female players showed adaptations relating the effective utilization of the pre-stretch and enhanced stability during the execution of the vertical jump tests on a SJS compared to RJS.

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“…In particular, the differences in Ground Reaction Force (GRF) in the landing phase between adults and youth are known to lead to bias towards the landing technique itself (Bassa et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

The Effects of Fatigue on Landing Performance in Young Female Soccer Players

Sannicandro,

Esposito,

D’Onofrio

et al. 2024

Teor. metod. fiz. vihov.

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Objectives. Jumping and landing constitute two movements that are used with a very high frequency in all sports and are two skills that have received a lot of attention in the literature because of their relationship with injury risk. The aim of this study is to analyze the following aspects: (a) to determine whether fatigue negatively affects landing technique after a jump, and (b) to test whether different metabolic and neuromuscular exercises have an effect on the landing technique. Materials and methods. The sample is composed of young female soccer players Under 14 (n = 29, 13.06 ± 1.27 years, 47.8 ± 2.6 kg; 143.2 ± 3.4 cm). Before and after two training protocols aimed at determining the state of fatigue (functional agility short-term fatigue protocol, and RSA protocol), landing technique was assessed using the Landing ErrorScoring System (LESS). Results. The LESS assessment for the pre-fatigue and post-functional agility short-term fatigue protocol conditions showed a value of 6.78 ± 0.81 and 8.74 ± 0.77 respectively (p > 0.001, ES: 1.39). The LESS assessment for the post-RSA protocol condition was 8.52 ± 0.87; this score was statistically significantly higher than the pre-fatigue condition (p > 0.001, ES: 1.24). Conclusions. Intensive exercise, both neuromuscular and metabolic, appears to have an effect on the landing technique of young female soccer players.

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Optimal Drop Height in Prepubertal Boys Is Revealed by the Performance in Squat Jump

Cited by 4 publications

References 58 publications

Reliability of a Pendulum Apparatus for the Execution of Plyometric Rebound Exercises and the Comparison of Their Biomechanical Parameters with Load-Matching Vertical Drop Jumps

Reliability of a Pendulum Apparatus for the Execution of Plyometric Rebound Exercises and the Comparison of Their Biomechanical Parameters with Load-Matching Vertical Drop Jumps

Vertical Jump Kinetic Parameters on Sand and Rigid Surfaces in Young Female Volleyball Players with a Combined Background in Indoor and Beach Volleyball

The Effects of Fatigue on Landing Performance in Young Female Soccer Players

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