Document Type

Journal Article

Publication Title

Journal of Sports Sciences


Taylor & Francis


School of Medical and Health Sciences




Meechan, D., McErlain-Naylor, S. A., McMahon, J. J., Suchomel, T. J., & Comfort, P. (2022). Comparing biomechanical time series data across countermovement shrug loads. Journal of Sports Sciences, 40(15), 1658-1667.


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.



Creative Commons License

Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.