PT  - JOURNAL ARTICLE
AU  - Byungjoo Noh
AU  - Chang Hong Youm
AU  - Myeounggon Lee
AU  - Hwayoung Park
AU  - Minji Son
AU  - Jinhee Kim
TI  - Effect of knee extensor fatigue level and sex on bilateral jump-landing
AID  - 10.1136/bmjsem-2019-000660
DP  - 2020 Jan 01
TA  - BMJ Open Sport & Exercise Medicine
PG  - e000660
VI  - 6
IP  - 1
4099  - http://bmjopensem.bmj.com/content/6/1/e000660.short
4100  - http://bmjopensem.bmj.com/content/6/1/e000660.full
SO  - BMJ OPEN SP EX MED2020 Jan 01; 6
AB  - Objective The purpose of this study was to determine the effect of fatigue level and sex on the range of motions of the lower extremities and impulses during the jump-landing phase after performing bilateral fatiguing tasks.Methods In total, 41 healthy young adults volunteered for this study. Participants’ jump-landing trajectories were monitored using nine cameras, and ground reaction forces were measured using a force plate. Participants performed five maximal bilateral countermovement jumps as prefatiguing tasks. The fatiguing tasks consisted of maximal effort contractions of the knee extensor at 60°/s on a dynamometer until task failure, defined as the inability to reach 50% of the peak knee extension torque for three consecutive times. The post-task maximal bilateral jumps were immediately captured after the participants failed the fatiguing task. Participants were asked to perform this cycle again, performing the fatiguing contraction task until failure to reach 30% of the peak knee extension torque.Results and conclusion It was found that the knee joint was more extended in the post-30% fatiguing task, which was due to the reduction of the flexion angle of the hip and knee joints in response to fatigue level. The impulses for both sexes were reduced at the severe fatigue level. Fatigability altered jump-landing kinematics, jump heights and impulses in response to fatigue level. The post-30% fatiguing task elicited more fatigue than the post-50% fatiguing task.