The dynamic blend of energy substrates—including glycogen, circulating glucose, free fatty acids, and amino acids—that are mobilized and utilized by the body to sustain physical and cognitive performance during periods of acute demand. The matrix’s composition directly influences endurance, power output, and recovery kinetics. A flexible and well-stocked matrix is crucial for peak human function.
Origin
This is a conceptual term from sports physiology and metabolic science, using “Matrix” to represent the complex, interwoven nature of the body’s energy sources and “Performance Fuel” to specify the context of high-demand states. It provides a framework for understanding and manipulating energy metabolism in performance settings.
Mechanism
During high-intensity activity, the matrix shifts to prioritize readily available glycogen and glucose, while lower-intensity or prolonged efforts increase the reliance on fatty acid oxidation. Optimal function requires a flexible matrix that can rapidly transition between fuel sources, a capacity known as metabolic flexibility. Hormones like adrenaline and glucagon play a key role in regulating the mobilization of these substrates from storage depots.
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