A new sledge jump system that allows almost natural reactive jumps

Journal of Biomechanics
A KramerMarkus Gruber

Abstract

Sledge jump systems (SJS) are often employed to examine the underlying mechanical and neuromuscular mechanisms of the stretch-shortening cycle (SSC) as they allow the systematic variation of impact velocity and energy. However, in existing SJS the jumps are not very comparable to natural jumps because of the long contact times (∼200%), which prevent the storage of kinetic energy. The aim of the present study was to evaluate if an ultra-light sledge, built in a way that joint movement is barely restricted, allows jumps that are comparable to natural jumps. Ground reaction forces, kinematic and electromyographic (EMG) data of 21 healthy subjects were compared between normal hoppings (NH) on the ground and hoppings in a custom-built SJS (sledge hoppings, SH). Normalized to NH, the ground contact times for the SH were prolonged (+22%), while the peak forces (-21%) and the preactivity of the soleus and gastrocnemius medialis muscles were reduced (-20% and -22%, respectively). No significant changes were observed for the iEMG of the short latency response of those muscles (+1% and +8%) and the ranges of motion in the ankle, knee and hip joint (differences of 1, 1 and 2 degrees). The reduced peak forces were associated with a reduced ...Continue Reading

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Citations

May 6, 2011·European Journal of Applied Physiology·Andreas KramerAlbert Gollhofer
Feb 11, 2016·Physiotherapy Theory and Practice·Isabelle JuchlerLorenz Radlinger
Feb 3, 2016·BMC Sports Science, Medicine and Rehabilitation·Jakob KümmelMarkus Gruber
Oct 8, 2013·Journal of Biomechanics·Pat McLaughlin
Jun 28, 2014·Sports Biomechanics·Robin Healy, Andrew J Harrison
Sep 6, 2019·Scandinavian Journal of Medicine & Science in Sports·Michael HelmRamona Ritzmann
Mar 26, 2013·Physiological Measurement·Laura-Anne M Furlong, Andrew J Harrison
Mar 7, 2013·Journal of Applied Biomechanics·Hiroaki HobaraKazuyuki Kanosue
Sep 2, 2017·Frontiers in Physiology·Charlotte RichterTobias Weber
Apr 11, 2019·Frontiers in Physiology·Markus GruberJörn Rittweger
Jul 19, 2018·Frontiers in Physiology·Britt SchoenrockDieter Blottner
Dec 5, 2018·Frontiers in Physiology·Martina A MaggioniAlexander C Stahn
Apr 6, 2021·Frontiers in Physiology·Janice WaldvogelMarco Narici

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