Both.
Concentric: Exercise where the muscle is contracted under a load
Eccentric: Exercise where the muscle is stretched under a load.
So when you squat down its eccentric, when you come back up its concentric.
Most exercises are both, with a few exceptions (i.e. jumping of a wall is mainly eccentric, while a punch is mainly concentric.
Eccentric contraction is associated with increased muscle growth, but also DOMS (Delayed onset muscle soreness, when your muscles are very sore after a workout).
The strongest muscle contractions are normally achieved by increasing the stimulation up to the maximal stimulus. There are various classifications of contractions, including eccentric and concentric.
Concentric lamellae
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concentric
Compact Bone-The compact bone is a dense bone found in the diaphysis. Its repeated pattern is arranged in concentric layers of solid bone tissue.
Glutes and quads contract when you stand, lengthen when you squat. So it's eccentric for those muscles. There are a bunch of muscles involved in a squat, some may be concentric.
Concentric
Let me know about the usage of Eccentric and Concentric pipe intersection in oil and gas industry? What are the major differences and concerns about Eccentric and Concentric pipe intersection in oil and gas industry?
In Resistance Training, concentric and eccentric contractions are two movements done by opposing muscles. Eccentric contractions are said to cause delayed onset of muscle sorennes( DOMS).
Concentric and eccentric movements.
muscular friction
The quads
eccentric on the way down concentric on the way up
Isometric
eccentric and concentric contractions
B. Isotonic contraction
Concentric, which is an adjective meaning, "having a common center".electric