National Certification Board for Therapeutic Massage & Bodywork (NCBTMB) Practice Exam

Question: 1 / 400

Which type of muscle contraction involves no visible movement?

Isometric contraction

An isometric contraction occurs when a muscle exerts force without changing its length, resulting in no visible movement at the joint. This type of contraction is essential for stabilizing joints and maintaining posture. For example, when you push against a wall or hold a heavy weight in a fixed position, your muscles are contracting isometrically as they generate force but do not change length or cause any movement.

In contrast, eccentric and concentric contractions involve visible movement; eccentric contractions lengthen the muscle under tension, while concentric contractions shorten the muscle, both resulting in the joint moving. Isokinetic contractions occur at a constant speed and usually involve the use of specialized equipment to maintain that speed, also leading to visible movement. Thus, isometric contraction is distinctly characterized by its lack of movement despite the application of force.

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Eccentric contraction

Concentric contraction

Isokinetic contraction

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