Eccentric Quasi-Isometric (EQI) training is a relatively new approach to resistance training that combines submaximal isometric contraction with maximal eccentric resistance. The purpose of this paper is to review the existing scientific literature on EQI training and summarize the current findings. Six studies examining the acute effects of EQI contractions on biomechanical, muscle activation, and morphological variables were included in the review. Most research was conducted on young adults and involved knee extensors, biceps brachii, and knee flexors. Differences in fatigue, time under tension, torque, and muscle activation were reported depending on gender and muscle group. Compared to traditional eccentric and isotonic training, EQI caused less delayed-onset muscle soreness and associated negative changes, despite the same cumulative mechanical load. Despite promising results, the field is still under-researched. Further studies are needed for a comprehensive understanding of the effects and potential applications of EQI training in sports, rehabilitation, and prevention.
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