The relationship between leg stiffness, forces and neural control of the leg musculature during the stretch-shortening cycle is dependent on the anticipation of drop height.

European Journal of Applied Physiology
Michael HelmRamona Ritzmann

Abstract

This study aimed at investigating how prior knowledge of drop heights affects proactive and reactive motor control in drop jumps (DJ). In 22 subjects, the effect of knowledge of three different drop heights (20, 30, 40 cm) during DJs was evaluated in seven conditions: three different drop heights were either known, unknown or cheated (announced 40 cm, but actual drop height was 20 cm). Peak ground reaction force (Fmax) to body weight (BW) ratio (Fmax/BW) and electromyographic (EMG) activities of three shank and five thigh muscles were assessed 150 ms before and during ground contact (GC). Ankle, knee and hip joint kinematics were recorded in the sagittal plane. Leg stiffness, proactive and reactive EMG activity of the leg muscles diminished in unknown and cheat conditions for all drop heights (7-33% and 2-26%, respectively). Antagonistic co-activation increased in unknown (3-37%). At touchdown, increased flexion in knee (~ 5.3° ± 1.9°) and hip extension (~ 2° ± 0.6°) were observed in unknown, followed by an increased angular excursion in hip (~ 2.3° ± 0.2°) and knee joints (~ 5.6° ± 0.2°) during GC (p < 0.05). Correlations between changes in activation intensities, joint kinematics, leg stiffness and Fmax/BW (p < 0.05) indicate...Continue Reading

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Citations

Aug 11, 2020·European Journal of Applied Physiology·Riccardo Di GiminianiMasedu Francesco
Nov 26, 2020·International Journal of Environmental Research and Public Health·Riccardo Di GiminianiFrancesco Masedu
Apr 6, 2021·Frontiers in Physiology·Janice WaldvogelMarco Narici

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