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High Intensity Training Response

Meaning

The High Intensity Training Response is the acute, profound cascade of physiological and endocrine adaptations triggered by brief, near-maximal bursts of physical effort, characteristic of High-Intensity Interval Training (HIIT). This response includes rapid shifts in autonomic nervous system activity, significant elevation of lactate production, and a robust pulsatile secretion of anabolic hormones. This acute systemic shock stimulates long-term adaptations in mitochondrial density, cardiorespiratory fitness, and muscle fiber recruitment. The intensity of the stimulus is key to unlocking these beneficial, systemic remodeling effects.