Eccentric Contractions use less Metabolic Energy > 자유게시판

Eccentric training is a type of strength training that involves using the target muscles to control weight as it moves in a downward motion. This type of training can help build muscle, improve athletic performance, and reduce the risk of injury. An eccentric contraction is the motion of an active muscle while it is lengthening under load. Eccentric training is repetitively doing eccentric muscle contractions. For example, Alpha Surge Male supplement support in a biceps curl the action of lowering the dumbbell back down from the lift is the eccentric phase of that exercise - as long as the dumbbell is lowered slowly rather than letting it drop (i.e., the biceps are in a state of contraction to control the rate of descent of the dumbbell). An eccentric contraction is one of the distinct phases in the movement of muscles and Alpha Surge Male strength formula tendons; they include isometric contraction (no movement), isotonic contraction, and Alpha Surge Male official site concentric contraction (shortening). Eccentric training focuses on slowing down the process of muscle elongation to challenge the muscles, which can lead to stronger muscles, alpha surge male official site faster muscle repair and increasing metabolic rate.

Eccentric movement provides a braking mechanism for muscle and alpha surge male official site tendon groups that are experiencing concentric movement to protect joints from damage as the contraction is released. Eccentric training is particularly good for casual and high-performance athletes or Alpha Surge Male testosterone support the elderly and patients looking to rehabilitate certain muscles and tendons. This movement has also been described as negative training. This "negative" movement is necessary to reverse the muscle from its initial trajectory. When the load exceeds the force that can be developed by the muscle at a constant length, alpha surge male official site as in an eccentric muscle action, the exercise is referred to as involving negative work, because the muscle is absorbing energy. Eccentric contractions use less metabolic energy, even though they can create more force than concentric actions. Adolf Eugen Fick discovered in 1882 that "contracting muscle under stretch could produce greater force than a shortening muscle contraction" like in concentric movements. Fifty years later, A.V. Hill found that "the body had lower energy demand during an eccentric muscle contraction than during a concentric muscle action".

Erling Asmussen introduced eccentric training in 1953, with "ex" meaning "away from" and "centric" meaning "center". Hence, the term was coined to mean a muscle contraction that moves away from the center of the muscle. The first revelation of the functional significance of these properties occurred in a clever demonstration devised by Bud Abbott, Alpha Surge Male vitality blend Brenda Bigland, and Murdoch Ritchie. They connected two stationary cycle ergometers back-to-back with a single chain, such that one cyclist pedaled forward and alpha surge male official site the other resisted this forward motion by braking the backward-moving pedals. Because the internal resistance of the device was low, the same force was being applied by both individuals, yet the task was much easier for the individual braking. This demonstration cleverly revealed that a tiny female resisting the movement of the pedals could easily exert more force than, and alpha surge male performance support hence control the power output of, a large burly Alpha Surge Male official site pedaling forward. During the eccentric phase of the movement, the muscle absorbs energy.

This work is done "by stretching the muscle and in this process, the muscle absorbs mechanical energy". This mechanical energy is dissipated or converted into one or a combination of two energies. The energy that is absorbed by the muscle can be converted into elastic recoil energy, and can be recovered and reused by the body. This creates more efficiency because the body is able to use the energy for the next movement, decreasing the initial impact or shock of the movement. For example, kinetic energy is absorbed in running every time one's foot strikes the ground and continues as one's mass overtakes the foot. At this moment, elastic recoil energy is at its maximum and a large amount of this energy is absorbed and is added to the next stride. This movement is similar to the action of springs, where the muscle is continually shortened and stretched resulting in enhanced effectiveness and force. It can lead to the perception of "less effort" even though dealing with higher force.