Effects of task and hip-abductor fatigue on lower limb alignment and muscle activation

Abstract Purpose Fatigue-induced hip-abductor weakness may exacerbate lower-limb misalignments during different dynamic single-leg tasks. We sought to evaluate the effects of fatigue and task on lower limb kinematics muscle activation find associations between measurements obtained in two Methods One-group pretest–posttest design. Seventeen healthy adults (9 W) performed squat (SL SQUAT ) hop HOP before after a hip-abduction protocol. Hip adduction, knee frontal plane projection angle (knee FPPA) heel inversion displacement were measured eccentric phase SL , as well gluteus medius (GMed), tensor fascia latae (TFL), peroneus longus (PER) tibialis anterior (TA). Moments tasks compared using repeated-measures two-way ANOVA. Correlation was evaluated Spearman’s correlation. Results No differences or found moments. Hip-adduction ( P = 0.005), GMed 0.008) PER 0.037) higher while TA < 0.001). FPPA inversion. not correlated tasks, ankle positively r s 0.524–0.746). Conclusion Different characteristics (slower deeper) seem have led increased hip adduction displacement, GMed, decreased activation, likely due balance requirements. However, didn’t influence alignment Finally, evaluations should be with since they don’t give same information.