What is the key difference between concentric and eccentric resistance training?

The key distinction in resistance training between concentric and eccentric movements lies in the function of the muscle during each type of contraction. Concentric resistance training specifically refers to muscle contractions that occur when the muscle shortens as it produces force. This is commonly experienced during the lifting phase of an exercise, such as when you curl a dumbbell upward in a bicep curl.

In this phase, the muscle fibers actively shorten and generate enough force to overcome any resistance, leading to joint movement. This process is essential for building strength, power, and muscle endurance.

Understanding this concept is fundamental for trainers and clients alike, as it informs how different types of resistance training can be employed to achieve specific fitness goals. Eccentric training, in contrast, involves the lengthening of the muscle under tension, showcasing a different aspect of muscle coordination and strength development.