Skeletal Muscle Contractions: Types (Nursing)

by Jasmine Clark

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    00:01 So now let's switch gears again and talk a little bit about different types of muscle contractions that can occur.

    00:08 So you have isotonic muscle contractions.

    00:11 In which the tension is constant while the muscle length is changing.

    00:17 If the muscle length gets smaller, it is referred to as a concentric isotonic contraction.

    00:24 And if the muscle length increases, it is referred to as an eccentric isotonic contraction.

    00:33 The other type of muscle contraction is isometric.

    00:37 And this we contract the muscles but we do not change the length.

    00:42 A good example of this is doing wall sits.

    00:46 So, as you can see in this demonstration, we're looking at both concentric and eccentric isotonic contractions.

    00:55 So as they move the weight up toward the shoulder, they're exhibiting a concentric contraction.

    01:01 The muscle length is shortening as the muscles contract.

    01:05 As we move the weight back down toward the hip.

    01:08 This is an eccentric contraction.

    01:10 And this case the muscle length is lengthening and the muscle is contracting.

    01:16 Now, we are exhibiting isometric contractions.

    01:21 And this demonstration, the weight is just being held and has not moved.

    01:26 The muscles are still having to contract in order to hold the weight up, but there's actually no change in the length of the muscle.

    About the Lecture

    The lecture Skeletal Muscle Contractions: Types (Nursing) by Jasmine Clark is from the course Musculoskeletal System – Physiology (Nursing).

    Included Quiz Questions

    1. Isometric
    2. Isotonic
    3. Eccentric
    4. Concentric

    Author of lecture Skeletal Muscle Contractions: Types (Nursing)

     Jasmine Clark

    Jasmine Clark

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