Supercharge Exercise Performance & Recovery with Cooling | Huberman Lab Essentials

Muscle contraction depends on ATP and temperature‑sensitive enzymes such as pyruvate kinase. Once local or systemic temperature approaches ~39–40°C, ATP-driven contraction rapidly fails and performance plummets—even if you don’t consciously feel ‘overheated.’ Actively managing temperature lets you maintain output for more sets, reps, or distance.

Glabrous skin on the palms, soles, and face contains arteriovenous anastomoses (AVAs), which can move heat in and out of the body far more efficiently than other skin regions. Cooling these areas can quickly lower core and muscle temperature, allowing you to safely extend effort and delay fatigue.

In Heller’s lab, subjects doing repeated pull-up sets went from about 100 total pull-ups to ~180 when they briefly cooled their palms between sets using a properly cooled device. The cooling medium must be cool—but not ice-cold—so it doesn’t cause vasoconstriction, which would block heat transfer.

On a treadmill at constant speed, simply raising ambient temperature increases heart rate via cardiac drift (heat-driven HR increase at constant effort). The brain integrates heat-driven HR plus effort-driven HR; when the combined load crosses a threshold, you quit. Cooling the palms reduces thermal load, blunts cardiac drift, and lets you continue longer at the same pace.

You can approximate lab-grade palmar cooling by briefly placing your hands (and optionally feet) in cool—not icy—water between sets or during breaks (e.g., 10–30 seconds between early sets, 30–60 seconds later as you heat up). Huberman reports about a 60% increase in total dips in a session using a basic bucket of cool tap water for hands and feet.