Hugo Noya Enríquez
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Depending on the relationship that an individual establishes with external resistances, muscle activation can lead to three different contractions: CONCENTRIC: With shortening of muscle fibers. Overcoming external resistance. The external force acts in the opposite direction to the movement. ECCENTRIC: With lengthening of muscle fibers. Assignment to external resistance. The external force acts in the…
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Skeletal muscle is a tissue capable of making a wide range of functional demands, from performing highly precise movements for which little force is required, to maximum contractions, to maintaining the body’s posture. This versatility is due, in part, to the existence of several types of muscle cells or fibers, which have different functional, metabolic…
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At rest, the thin and thick filaments of a sarcomere slightly overlap. During contraction, the thin and thick filaments slide past each other bringing the Z lines closer to the center of the sarcomere. Contraction is stimulated when the muscle fiber innervating α motor neuron releases the neurotransmitter acetylcholine as a consequence of an action…
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The human body contains approximately 650 muscles and the different sets of muscles are enveloped by a membrane of connective tissue called the fascia (e.g., thoracolumbar fascia). The functional and structural unit of muscle tissue is the muscle fiber, differentiated muscle cell or myocyte. Each muscle fiber is surrounded by a fine network of reticular…
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Strength training consists of following a program that increases an individual’s ability to produce muscular effort against resistance for the purpose of displacing it. This resistance is almost always external, like when we lift an Olympic bar, but it can also be internal resistance, like when we lift our body when performing a pull-up.
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In sprinting form makes function. What does this mean? It means that the sprint technique is highly dependent on the differences in muscular balance between agonist and antagonist muscles. Kelly Baggett distinguishes in his book “No-Bull Speed Development Manual” two types of runners based on the predominance of one muscle group or another, with its…
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Surely you have heard phrases like this from the mouths of many sports coaches: “If you start lifting weights you will get stronger, but you will sacrifice your flexibility and joint mobility.” And vice versa: “If your goal is to gain a lot of flexibility you have to avoid lifting weights so that it doesn’t…
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One way we can classify strengthening exercises is into multi-joint and single-joint. An exercise is considered multi-joint when several joints move during its execution, so that all muscle groups belonging to a kinetic chain are strengthened. In this way we can say that the entire body is strengthening at the same time since it intervenes…
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When performing a movement, the muscles of our body act in the form of kinetic chains. But what is a kinetic chain? We understand the kinetic chain as each part of the body (including muscles, joints and nerves), which is related together to produce a certain movement of the bones. There are several ways to…
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According to Kelly Baggett in his book “No-Bull Speed Development Manual”, if we look at the way athletes sprint, especially at the amateur level, we can broadly differentiate two types of sprinters: athletes who are faster than strong and athletes who are stronger than fast. Below we are going to explain the differences of this…
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