During gait evaluation, which contraction type is primarily responsible for deceleration?

The correct answer is that eccentric contraction plays a crucial role in deceleration during gait evaluation. Eccentric contractions occur when a muscle lengthens while generating force, which is essential in controlling movement and slowing down body segments. For instance, during walking, as a person prepares to place their foot on the ground, the quadriceps undergo eccentric contraction to decelerate the leg and control knee flexion. This mechanism helps stabilize the body and maintain balance, reducing the risk of falls.

On the other hand, isometric contractions involve muscle activation without changing its length, mainly providing stability rather than controlling movement dynamics. Concentric contractions, which occur when a muscle shortens while generating force, are involved in accelerating movements rather than deceleration. Static contraction is not a recognized term in the context of muscle contractions in gait evaluation, further emphasizing that eccentric contraction is the one primarily responsible for the deceleration phase.