Comparing biomechanical time series data across countermovement shrug loads
The effect of load on time-series data has yet to be investigated during weightlifting derivatives. This study compared the effect of load on the force-time and velocity-time curves during the countermovement shrug (CMS). Twenty-nine males performed the CMS at relative loads of 40%, 60%, 80%, 100%, 120%, and 140% one repetition maximum (1RM) power clean (PC). A force plate measured the vertical ground reaction force (VGRF), which was used to calculate the barbell-lifter system velocity. Time-series data were normalized to 100% of the movement duration and assessed via statistical parametric mapping (SPM). SPM analysis showed greater negative velocity at heavier loads early in the unweighting phase (12-38% of the movement), and greater positive velocity at lower loads during the last 16% of the movement. Relative loads of 40% 1RM PC maximised propulsion velocity, whilst 140% 1RM maximized force. At higher loads, the braking and propulsive phases commence at an earlier percentage of the time-normalized movement, and the total absolute durations increase with load. It may be more appropriate to prescribe the CMS during a maximal strength mesocycle given the ability to use supramaximal loads. Future research should assess training at different loads on the effects of performance.
© Copyright 2022 Journal of Sports Sciences. Taylor & Francis. Kaikki oikeudet pidätetään.
Aiheet: | painonnosto harjoittelu voima, vahvuus nopeus biomekaniikka tutkimusmenetelmä maan reaktiovoima |
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Aihealueet: | voima ja nopeus urheilu |
Tagging: | Kraft-Zeit-Verlauf Geschwindigkeits-Zeit-Verlauf |
DOI: | 10.1080/02640414.2022.2091351 |
Julkaisussa: | Journal of Sports Sciences |
Julkaistu: |
2022
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Vuosikerta: | 40 |
Numero: | 15 |
Sivuja: | 1658-1667 |
Julkaisutyypit: | artikkeli |
Kieli: | englanti (kieli) |
Taso: | kehittynyt |