What happens to the muscle during an eccentric contraction?

During an eccentric contraction, the muscle actively resists lengthening while under tension. This occurs when the muscle is subjected to an external force greater than the force it generates, causing it to elongate. The control over the lengthening muscle helps manage the movement and prevent injury, allowing for greater strength and stability. For instance, during the lowering phase of a bicep curl, the biceps lengthen while still applying force against the weight. This is crucial for various movements in strength training, rehabilitation, and athletic performance, as it helps in maintaining control and stability during dynamic activities.