Hamstring strength and architectural adaptations following inertial flywheel resistance training

Joel Presland, David A. Opar, Morgan Williams, Jack Hickey, Nirav Maniar, Connor Lee Dow, Matthew N. Bourne, Ryan Timmins

    Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

    11 Wedi eu Llwytho i Lawr (Pure)

    Crynodeb

    Objectives: To investigate the architectural and strength adaptations of the hamstrings following 6-weeks of inertial flywheel resistance training.

    Design: Randomised, stratified training intervention

    Methods: Twenty healthy males undertook 6-weeks of a conventional (n=10) or eccentrically-biased (n=10) flywheel leg-curl training intervention as well as a subsequent 4-week detraining period. Biceps femoris long head (BFlh) architecture was assessed weekly, whilst assessments of eccentric and isometric knee flexor strength and rate of force development (RFD) was conducted prior to and following the intervention and detraining periods.

    Results: The participants who undertook the eccentrically-biased flywheel intervention showed a significant 14±5% (p<0.001, d=1.98) increase in BFlh fascicle length after 6-weeks of training. These improvements in fascicle length subsequently declined by 13±4% (p<0.001. d=-2.04) following the 4-week detraining period. The conventional flywheel leg-curl training group saw no changes in BFlh fascicle length after the intervention (-0.5%±0.8%, p=0.939, d=-0.04) or detraining (-1.1%±1%,p=0.984, d=-0.03) periods. Both groups saw no changes in any of the strength or RFD variables after the intervention or the detraining period.

    Conclusions: Flywheel leg-curl training performed with an eccentric bias led to significant lengthening of BFlh fascicles without a change in RFD, eccentric or isometric strength. These increases in fascicle length were lost following a 4-week detraining period. Conventional flywheel leg-curl training resulted in no changes in fascicle length and strength. These findings suggest that additional eccentric bias is required during inertial flywheel resistance training to promote fascicle lengthening in the BFlh, however this may still be insufficient to cause alterations to strength and RFD.  

    Iaith wreiddiolSaesneg
    Tudalennau (o-i)1093-1099
    Nifer y tudalennau7
    CyfnodolynJournal of Science and Medicine in Sports
    Cyfrol23
    Rhif cyhoeddi11
    Dyddiad ar-lein cynnar19 Mai 2020
    Dynodwyr Gwrthrych Digidol (DOIs)
    StatwsCyhoeddwyd - 19 Mai 2020

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