Unlike concentric and eccentric actions, which involve the muscle changing length as it works, with isometric actions, the muscle is working but not changing length. The fact that you can lower the weight slowly and under control can be attributed to the eccentric actions of your biceps. If the biceps weren’t working against the dumbbell in your hand, the weight would flop right down with the speed of gravity. The biceps curl is a great example: As the weight lowers and your elbows straighten, the biceps muscle works to control the lowering weight. “Conversely, eccentric exercises are when the muscle is firing, but rather than shortening, it is actually lengthening.” That’s what pulls the weight up to your shoulder. As you flex your elbow and fire your biceps, the biceps muscle activates and shortens,” Erickson says. An example of this would be the biceps muscle when doing a biceps curl. “In concentric motions, the muscle fires and shortens during the exercise. “Rather, it remains the same length.” That’s in contrast to traditional exercises, which are made up of concentric and eccentric muscle actions. Erickson, a sports medicine physician at the Rothman Orthopaedic Institute in New York. “Isometric muscle actions are exercises in which the muscle is activating or firing but is not shortening or lengthening,” says Dr. Isometric exercises, compared with traditional exercises that involve moving your body or weights up and down, are all about working your muscles to hold a position. WHILE IT MAY SEEM counterintuitive, one way to build strength, endurance and healthy muscles is to not move. Business & Finance Click to expand menu.
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