A new sledge jump system that allows almost natural reactive jumps

Kramer, Andreas; Ritzmann, Ramona; Gollhofer, Albert; Gehring, Dominic; Gruber, Markus

A new sledge jump system that allows almost natural reactive jumps

Dateien

Kramer_127842.pdfGröße: 1.02 MBDownloads: 525

Datum

2010

Autor:innen

Kramer, Andreas

Ritzmann, Ramona

Gollhofer, Albert

Gehring, Dominic

Gruber, Markus

Open Access-Veröffentlichung

Open Access Green

Sammlungen

Sportwissenschaft

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Journal of Biomechanics. 2010, 43(14), pp. 2672-2677. ISSN 0021-9290. eISSN 1873-2380. Available under: doi: 10.1016/j.jbiomech.2010.06.027

Zusammenfassung

Aim: 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 (not, vert, similar200%), 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.
Methods: 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).
Results: 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 leg stiffness (−21%).
Conclusion: The new system allows reactive jumps that are rather comparable to natural jumps. Therefore, the new SJS seems to be an adequate system in order to examine the SSC under controlled and almost natural conditions.

Fachgebiet (DDC)

796 Sport

Schlagwörter

Sledge, SSC, Motion analysis, Hopping, Electromyography

Zitieren

ISO 690

KRAMER, Andreas, Ramona RITZMANN, Albert GOLLHOFER, Dominic GEHRING, Markus GRUBER, 2010. A new sledge jump system that allows almost natural reactive jumps. In: Journal of Biomechanics. 2010, 43(14), pp. 2672-2677. ISSN 0021-9290. eISSN 1873-2380. Available under: doi: 10.1016/j.jbiomech.2010.06.027

BibTex

@article{Kramer2010-10-19sledg-12784,
  year={2010},
  doi={10.1016/j.jbiomech.2010.06.027},
  title={A new sledge jump system that allows almost natural reactive jumps},
  number={14},
  volume={43},
  issn={0021-9290},
  journal={Journal of Biomechanics},
  pages={2672--2677},
  author={Kramer, Andreas and Ritzmann, Ramona and Gollhofer, Albert and Gehring, Dominic and Gruber, Markus}
}

RDF

<rdf:RDF
    xmlns:dcterms="http://purl.org/dc/terms/"
    xmlns:dc="http://purl.org/dc/elements/1.1/"
    xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
    xmlns:bibo="http://purl.org/ontology/bibo/"
    xmlns:dspace="http://digital-repositories.org/ontologies/dspace/0.1.0#"
    xmlns:foaf="http://xmlns.com/foaf/0.1/"
    xmlns:void="http://rdfs.org/ns/void#"
    xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > 
  <rdf:Description rdf:about="https://kops.uni-konstanz.de/server/rdf/resource/123456789/12784">
    <dcterms:isPartOf rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/35"/>
    <dc:creator>Kramer, Andreas</dc:creator>
    <dc:contributor>Kramer, Andreas</dc:contributor>
    <dc:rights>terms-of-use</dc:rights>
    <dc:creator>Gollhofer, Albert</dc:creator>
    <dc:language>eng</dc:language>
    <dc:creator>Gehring, Dominic</dc:creator>
    <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-07-05T09:25:08Z</dcterms:available>
    <void:sparqlEndpoint rdf:resource="http://localhost/fuseki/dspace/sparql"/>
    <foaf:homepage rdf:resource="http://localhost:8080/"/>
    <dc:contributor>Gehring, Dominic</dc:contributor>
    <dspace:isPartOfCollection rdf:resource="https://kops.uni-konstanz.de/server/rdf/resource/123456789/35"/>
    <dspace:hasBitstream rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/12784/2/Kramer_127842.pdf"/>
    <dcterms:hasPart rdf:resource="https://kops.uni-konstanz.de/bitstream/123456789/12784/2/Kramer_127842.pdf"/>
    <dc:contributor>Gruber, Markus</dc:contributor>
    <dc:creator>Gruber, Markus</dc:creator>
    <dcterms:rights rdf:resource="https://rightsstatements.org/page/InC/1.0/"/>
    <dc:creator>Ritzmann, Ramona</dc:creator>
    <dc:contributor>Ritzmann, Ramona</dc:contributor>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-07-05T09:25:08Z</dc:date>
    <dc:contributor>Gollhofer, Albert</dc:contributor>
    <dcterms:abstract xml:lang="eng">Aim: 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 (not, vert, similar200%), 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.&lt;br /&gt;Methods: 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).&lt;br /&gt;Results: 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 leg stiffness (−21%).&lt;br /&gt;Conclusion: The new system allows reactive jumps that are rather comparable to natural jumps. Therefore, the new SJS seems to be an adequate system in order to examine the SSC under controlled and almost natural conditions.</dcterms:abstract>
    <dcterms:issued>2010-10-19</dcterms:issued>
    <dcterms:title>A new sledge jump system that allows almost natural reactive jumps</dcterms:title>
    <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/12784"/>
    <dcterms:bibliographicCitation>Journal of Biomechanics ; 43 (2010), 14. - pp. 2672-2677</dcterms:bibliographicCitation>
  </rdf:Description>
</rdf:RDF>

Universitätsbibliographie

Ja