Question

performing planks is an example of which of the following types of contractions?
a) isotonic
b) isometric
c) concentric
d) isokinetic

Explanation:

To determine the type of muscle contraction in planks:

• Isotonic contractions involve muscle length change (e.g., lifting weights).
• Isometric contractions occur when muscle tension is generated but there is no visible change in muscle length or joint movement (planks require holding a position, so muscles contract without shortening/lengthening).
• Concentric contractions are a type of isotonic where muscle shortens (e.g., bicep curl up).
• Isokinetic contractions involve constant speed of movement (not applicable to planks).

So planks are isometric.

Answer:

b) Isometric