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Change of direction (COD) total time is influenced by linear sprint ability and technique. Therefore, COD performance should be isolated from COD total time by measuring only the time taken to perform the COD and COD technique should be controlled. Current COD studies focus on the plant and penultimate (PEN) braking steps (Dos’ Santos et al, 2017, Jones et al, 2017), however, deceleration during a COD extends beyond these two steps (Nedergaard et al, 2014), thus, more braking steps ground reaction forces (GRF) needs to be examined. Cross sectional COD studies have shown that athletes with faster COD performance were stronger during eccentric squat (Spiteri et al, 2015) and produced higher force during eccentric isokinetic knee extensor and flexor test than athletes who exhibit slower COD performance (Jones et al, 2017). Therefore, it seems that eccentric strength is associated with COD performance. It is necessary to examine braking steps before the PEN step to examine braking strategies of faster and slower performers. Additionally, eccentric strength, which is deemed advantageous for COD braking should be further examined using a multi-joint strength assessment to further determine eccentric capacity during COD performance.

Publication Date



School of Medical and Health Sciences


Sports Sciences


Originally published as: Yu, W., Nimphius, S., Haff, G. G. & Nosaka, K. (2018). Braking ground reaction force during 900 sidestep cut and leg muscle strength. Poster presented at the11th International Conference on Strength Training 2018, held Perth, Western Australia, 30 November – 3 December, 2018.

Braking ground reaction force during 90deg sidestep cut and leg muscle strength.