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Erschienen in: European Journal of Applied Physiology 2/2018

20.12.2017 | Original Article

Bilateral deficit of spring-like behaviour during hopping in sprinters

verfasst von: Mitsuo Otsuka, Toshiyuki Kurihara, Tadao Isaka

Erschienen in: European Journal of Applied Physiology | Ausgabe 2/2018

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Abstract

Purpose

Unilateral leg stiffness is a key contributor to sprint running speed, thereby great bilateral deficit (BLD) of leg stiffness would be expected to be observed in sprinters. However, it remains clear only BLD of leg stiffness at the preferred hopping frequency in non-sprinters. The purpose of this study was to clarify the BLD of spring-like behaviour in hopping at various frequencies and the effect of chronic adaptation via sprint running experience on BLD during the hopping.

Methods

Fifteen male experienced sprinters and 12 male novices participated in this study. They were instructed to hop in place at three frequencies (2.0, 2.5, and 3.0 Hz), and to perform hopping with maximal effort. Ground reaction forces (GRF) of both legs during the hopping were recorded using two force plates.

Results

At higher hopping frequencies during the unilateral and bilateral hopping, smaller peak value of vertical GRF (F max) and greater leg stiffness (K leg) were significantly observed. The BLD index of F max and the BLD index of K leg were significantly smaller at higher hopping frequencies. No significant differences of BLD index of F max and BLD index of K leg were observed between sprinters and novices.

Conclusion

Our results demonstrate that neuromuscular inhibition in the contralateral leg changes during the hopping based on hopping frequency. This suggests that plyometric training in the beginning of rehabilitation should involve bilateral jumping at a high frequency. In experienced sprinters, detailed mechanics of chronic neuromuscular adaptation via unilateral facilitation of spring-like behaviour should be assessed by measuring electromyographic activity.
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Metadaten
Titel
Bilateral deficit of spring-like behaviour during hopping in sprinters
verfasst von
Mitsuo Otsuka
Toshiyuki Kurihara
Tadao Isaka
Publikationsdatum
20.12.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Applied Physiology / Ausgabe 2/2018
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-017-3791-x

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