What is a key difference in adaptations between eccentric and concentric training?

• A. Eccentric contractions produce greater force and remodeling with more muscle damage; concentric contractions have less mechanical strain but still contribute to strength.
• B. Concentric contractions produce more damage.
• C. Eccentric contractions do not affect tendons.
• D. Concentric contractions cause more remodeling.

Answer: (A)

A key distinction in how the muscle adapts to load is that eccentric contractions, where the muscle lengthens under tension, can generate higher force and tend to cause more mechanical strain and micro-damage to the muscle fibers. That damage triggers remodeling and growth during recovery, so eccentric training often leads to greater increases in muscle size and strength per training stimulus—though it comes with more soreness and longer recovery. In contrast, concentric contractions, which shorten the muscle under tension, produce less mechanical strain and typically cause less damage, yet they still build strength through neural adaptations and some hypertrophy. So the best answer captures that eccentric work yields more force and remodeling with more damage, while concentric work provides strength gains with less damage and strain.