What is an eccentric contraction in resistance training?

• A. When a muscle shortens under tension
• B. When a muscle lengthens under tension
• C. When a muscle is held at a static position
• D. When a muscle relaxes after tension

Answer: (B)

An eccentric contraction in resistance training refers to the process where a muscle lengthens while still under tension. This type of contraction typically occurs when a muscle is controlled as it returns to its original length after being shortened. For example, during the lowering phase of a bicep curl, as you lower the weight, the biceps muscle is lengthening while still maintaining tension to control the descent of the weight. This is crucial in resistance training as it helps in building muscle strength, as well as improving muscle endurance and stability, due to the greater force production capabilities during eccentric phases.