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  • Landing Impact Intensities for Jumping Exercises From the OPTIMA-Ex Trial in Trained and Untrained Women

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    Lambert246659.pdf (590.0Kb)
    Author(s)
    Lambert, Conor
    Beck, Belinda R
    Weeks, Benjamin K
    Griffith University Author(s)
    Weeks, Benjamin K.
    Lambert, Conor
    Beck, Belinda R.
    Year published
    2019
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    Abstract
    High-intensity mechanical loads are required to elicit a positive adaptive bone response. Our aim was to quantify the mechanical loads of impact exercises used in each progressive stage of a bone-targeted exercise intervention (the OPTIMA-Ex trial) and to investigate differences in mechanical loads between untrained and trained subjects. A randomized repeated measures experimental design was used to quantify and compare the mechanical loads, including vertical ground reaction force (vGRF) and the rate of loading (RoL) of the landing phase, of all impact exercises applied in the OPTIMA-Ex trial and to determine the load ...
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    High-intensity mechanical loads are required to elicit a positive adaptive bone response. Our aim was to quantify the mechanical loads of impact exercises used in each progressive stage of a bone-targeted exercise intervention (the OPTIMA-Ex trial) and to investigate differences in mechanical loads between untrained and trained subjects. A randomized repeated measures experimental design was used to quantify and compare the mechanical loads, including vertical ground reaction force (vGRF) and the rate of loading (RoL) of the landing phase, of all impact exercises applied in the OPTIMA-Ex trial and to determine the load intensity for each training stage of the impact intervention. Fifteen healthy young adult women aged 18–30 years (mean 23.1 ± 3.5 years) were recruited (5 trained and 10 untrained). Overall, vGRF was classified as high impact (>4 times body mass [BM]) for all 7 training stages (4.70 ± 1.89 to 6.79 ± 2.17 BM), whereas RoL ranged from 207.01 ± 175.09 to 371.52 ± 393.43 BM·s−1 across the stages. Furthermore, a significant time effect was observed between training stages for vGRF/BM (p = 0.001) and RoL (p < 0.001). Trained subjects exhibited greater impact loads than untrained subjects for activities at every training stage (p < 0.01). We found that impact activities at every stage of the OPTIMA-Ex trial not only met the GRF criteria for high intensity but also exhibited progressive increases in load for successive stages. Furthermore, trained subjects were capable of producing greater impact loads than untrained subjects.
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    Journal Title
    Journal of Strength and Conditioning Research
    DOI
    https://doi.org/10.1519/JSC.0000000000003204
    Copyright Statement
    © 2019 LWW. This is a non-final version of an article published in final form in Journal of Strength and Conditioning Research. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal link for access to the definitive, published version.
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Human Movement and Sports Sciences
    Medical Physiology
    Publication URI
    http://hdl.handle.net/10072/386641
    Collection
    • Journal articles

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