Speed-endurance is the ability to prolong the amount of time where a near maximal speed can be maintained. During activity such as this, accumulation of blood lactate disturbs the excitation-contraction coupling and cross-bridge formation. The muscle's mechanical properties are disturbed, resulting in a decrease in force production, peak force and velocity. Speed-endurance training can improve the clearance rate of lactate and reduce early lactate formation. Speed endurance is crucial to a multitude of athletes and a lack of it will result in reduced sports capability.