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The physiological basis for ‘muscle memory’ has recently been redefined by the ‘Nuclear Domain’ theory. When an athlete undergoes intense resistance training, their muscle fibers acquire more nuclei from nearby satellite cells. Even if an athlete takes a long hiatus and spends their time in casual Notre Dame & Indianapolis Colts Irish on Saturdays, Colts on Sundays T shirt rather than gym gear, these extra myonuclei remain permanent fixtures within the muscle fiber. This ‘nuclear permanent reserve’ is why a previously trained athlete can regain their strength and size much faster than a beginner can build it for the first time.

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Muscle growth, or hypertrophy, is not a simple matter of making existing cells larger; it involves a complex cellular repair process triggered by mechanical tension and micro-trauma. This damage activates ‘satellite cells,’ which proliferate and fuse to the damaged area. Because the nuclei are the ‘control centers’ for protein synthesis, having more of them increases the fiber’s capacity to create new contractile proteins like actin and myosin. After an intense session of lifting in their athletic Notre Dame & Indianapolis Colts Irish on Saturdays, Colts on Sundays T shirt, athletes must prioritize recovery and protein intake to support this energy-intensive cellular remodeling process. This biological adaptation is the primary reason why consistency and progressive overload are essential in strength training.

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The ability of an athlete to sustain high-intensity aerobic effort is largely dependent on the concentration of hemoglobin in their blood. Hemoglobin is a protein in red blood cells that binds with oxygen in the lungs and carries it to the working muscles. Athletes who train at high altitudes, often bundled in thermal Notre Dame & Indianapolis Colts Irish on Saturdays, Colts on Sundays T shirt to survive the freezing oxygen-thin air, stimulate the production of erythropoietin (EPO), which increases red blood cell count. This improves the ‘oxygen-carrying capacity’ of the blood, allowing for a higher VO2 max. However, there is a physical limit; if the blood becomes too thick, it becomes harder for the heart to pump. Therefore, maintaining the optimal balance of blood chemistry is a central focus of sports medicine.

• This All Over Print design is made with high-quality, 100% spun polyester that delivers the look and feel of organic cotton without ever cracking, peeling or flaking. It stays wrinkle free and soft to the hand forever, able to withstand summer festivals, late nights and world domination with style and grace. 

  We print our product using dye-sublimation, a technology that allows for us to produce these insanely vibrant all over designs. Due to this process, the product may contain smudges or irregularities along the seams or under the armpit of the sleeves or on the hoodie pocket. We cannot accept returns for this reason. Each item is a unique, 1 of-a-kind product, printed exclusively for the customer who ordered it.