**multiple choice question, please provide explanation to answer for full points
ID: 19024 • Letter: #
Question
**multiple choice question, please provide explanation to answer for full points!**Lets say you're positioned with both legs side by side and you contract your calf muscles to the point where the head of your foot carries your weight.
-The period where you raised your heel off the floor, were your calf muscles experiencing:
(1) Concentric, (2) Eccentric, or (3) Isometric contraction?
Likewise, when you've finally reached a state where you can balance yourself on your toes are your calf muscles experiencing:
(1) Concentric, (2) Eccentric, or (3) Isometric conctraction?
Explanation / Answer
A concentric muscle contraction is a type of muscle activation that increases tension on a muscle as it shortens. Concentric contractions are the most common types of muscle activation athletes perform in a gym when lifting weights.
Exercises That Cause Concentric Contractions
Common exercises that cause concentric contractions include the lifting phase of a bicep curl, a squat or a pull up. Running up hill or climbing stairs also causes the quadriceps to contract concentrically. Concentric contractions are common to many sports in which you need to generate a lot of power or explosive force.
concentric contraction is atype of muscle contraction which the muscle shortens while genrating aforce
The muscle shortens to produce movement.
A muscle contraction in which shortening occurs.
An eccentric contraction is a type of muscle movement where the muscle lengthens as it is put under tension. While the word “contraction” often conjures up an image of a muscle shortening, it is important to note that eccentric contractions involve an extension of the muscle. These types of muscle movements are very common. For athletes, the risk of injury is often higher when muscles are being lengthened in an eccentric contraction. Injuries classified as pulls and strains often involve a muscle that was stretched too far.
The purpose of an eccentric contraction is to regulate a movement. The lengthening muscle resists the tension to keep the movement smooth and even. It also protects the joints by controlling the speed, angle, and direction of the movement. Multiple muscles usually work at the same time and can pull in different directions for highly controlled movements.
A contraction in which a muscle exerts force but does not change in length. Isometric contractions are common in activities such as yoga and stretching.
Muscle contractions are defined according to how they lengthen or respond to force. The four types of muscular contractions are concentric, eccentric, isotonic and isometric. Isometric exercises or training is commonly used in strength training and relates to exercises where there is no range of motion and no visible movement of the joint or muscle. Because the muscle does not move under force, its length does not change.
Isometric exercises are commonly used in strength training, yoga and martial arts. In yoga or martial arts, isometric contractions can be a safe and effective way to hold a pose and work on balance and flexibility. With strength training, isometrics can cause more muscles to react through stabilization. For example, if you are holding a weight overhead, the abdominal and back muscles will be engaged to help stabilize the weight.
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