Concentric Action

Can't Do One Pullup? Stay Positive

Countless articles have been written about pullups. MOST of those articles are assuming one has the ability to do at least a couple of pullups already. For those that can't even do one, which are MANY, well, that room is so silent you can hear a pin drop.

And when someone does speak up…it's questionable at best.

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Common Misnomers and Mix-ups: Muscle Actions, Balance, Stability, Single Legs and Straight Back

All muscle contractions involve the muscle shortening or attempting to shorten against resistance. There are not different types of contractions only different types of actions (movement or lack thereof) depending on the circumstances. A muscle is producing force by contraction but this may lead to shortening (concentric action), lengthening (eccentric action), or maintaining length (isometric action). So the concept of muscle actions specifically describe the type of length changes that skeletal muscle may undergo after it has been activated by the nervous system.

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The Stretching Handbook 2

The purpose of this chapter is to introduce you to some of the basic physiological concepts that come into play when a muscle is stretched. Concepts will be introduced initially with a general overview and then (for those who want to know the gory details) will be discussed in further detail. If you aren't all that interested in this aspect of stretching, you can skip this chapter. Other sections will refer to important concepts from this chapter and you can easily look them up on a "need to know" basis.

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