Whole Body Cryotherapy involves briefly exposing the body to extremely cold air, typically between -110°C and -160°C, for two to three minutes. This intense, short-term exposure triggers physiological responses designed to protect the body from the sudden temperature drop. Users often wonder if the shock of the cold will leave them drained or energized. The complex interaction between the nervous system and hormonal release usually leans toward invigoration rather than exhaustion.
The Body’s Immediate Reaction to Extreme Cold
When the skin is exposed to hyper-cooled air, the body initiates a rapid, protective physiological response. The sudden cold immediately triggers the sympathetic nervous system, often called the “fight or flight” mechanism. This stress response conserves core heat and prepares the body for perceived danger. One of the first reactions is rapid vasoconstriction, shunting blood toward the body’s core to protect internal organs. Concurrently, the adrenal glands release catecholamines, specifically adrenaline and noradrenaline, into the bloodstream. This surge of noradrenaline heightens alertness, increases heart rate, and enhances metabolic processes.
Why Users Report Increased Energy
The experience of increased energy is directly linked to the rapid hormonal changes initiated during the cold exposure. The release of noradrenaline, a key part of the stress response, plays a major role in improving focus and vigilance, translating into mental clarity and greater attention. Beyond the stimulating catecholamines, the cold exposure prompts the release of endorphins. These natural compounds act as mood elevators and pain suppressors, contributing to a sense of euphoria and general well-being. By reducing systemic inflammation and pain, cryotherapy allows the body to redirect energy otherwise spent on recovery, decreasing delayed-onset muscle soreness and improving recovery time.
When Fatigue Might Occur
While an energy boost is the typical outcome, a minority of users may experience subsequent tiredness due to secondary factors. One potential cause is the post-adrenaline “crash,” the dip in energy that occurs as the stimulating effects of catecholamines fade. After the initial hormonal peak, the body must normalize its levels, which can leave a temporary feeling of sluggishness. Fatigue can also signal that the body is expending significant metabolic energy to address pre-existing conditions, such as high systemic inflammation or chronic pain. Failing to replenish fluids or having low reserves can also contribute to exhaustion, as the body struggles to maintain homeostasis after the thermal shock.