Question

you are holding a plank position for 30 seconds. what type of exercise is this?
select one:
o a. eccentric, dynamic
o b. dynamic, isotonic
o c. concentric, static
o d. static, isometric

Explanation:

• Static exercise: In a plank position, there is no visible movement of the joints or body parts. The body is held in a fixed position.
• Isometric exercise: Isometric exercises involve muscle contraction without a change in muscle length or joint angle. In a plank, the muscles (such as the core muscles) are contracting to hold the position, but there is no shortening or lengthening of the muscles in a way that would change the joint angles significantly.
• Eccentric and concentric: Eccentric (muscle lengthening while contracting) and concentric (muscle shortening while contracting) are types of dynamic muscle actions which involve joint movement. Since there is no joint movement in a plank, options with these terms (a, c) can be eliminated.
• Dynamic and isotonic: Dynamic exercises involve movement. Isotonic exercises involve muscle contraction with a change in muscle length (either concentric or eccentric). Since a plank is a non - moving (static) exercise, options with dynamic (a, b) can be eliminated.

Answer:

d. Static, isometric