Shivering Thermogenesis
TL;DR
Maximum-intensity crisis response that generates 5× normal output but depletes reserves in hours - the physiology of sprint mode that explains both its power and its unsustainability.
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Shivering thermogenesis generates heat through involuntary muscle contractions at 10-20 Hz, producing 5× resting metabolic rate with 100% efficiency (all muscle work becomes heat). Limitation: exhausting, depleting glycogen in 2-4 hours.
Business Application of Shivering Thermogenesis
PayPal demonstrated shivering thermogenesis during dot-com crash - cutting all products except payments, focusing 200 employees with laser precision. Intense but unsustainable; emerged dominant while competitors froze.