Heat and cold therapy backed by science
Your body is designed to adapt to controlled stress.
Heat and cold create predictable physiological responses that strengthen the cardiovascular system, regulate hormones, improve recovery, and increase resilience.
The benefits of heat therapy
Heat exposure elevates heart rate to levels similar to light – moderate exercise.
Studies show increased stroke volume, improved endothelial function, and reduced blood pressure in regular sauna users.
Heat increases blood flow and promotes vasodilation, helping deliver oxygen and nutrients to muscles while clearing metabolic waste faster.
This is why saunas are widely used by athletes for efficient recovery after training.
Controlled heat exposure reduces cortisol and increases endorphins.
This creates a calming effect and supports better sleep quality.
Heat stress elevates metabolic rate as the body works to maintain temperature.
Studies suggest a 1.5 – 2x temporary increase in metabolic activity during a session.
Sauna exposure increases the expression of heat shock proteins – cellular repair agents linked to:
- Improved longevity pathways
- Reduced inflammation
- Enhanced stress resilience
The benefits of cold therapy
Cold exposure causes vasoconstriction (narrowing of blood vessels), which reduces inflammation and swelling.
This is why ice baths are used clinically and in sports recovery.
Multiple studies show cold immersion reduces DOMS (delayed-onset muscle soreness) 24 – 48 hours post-exercise.
Cold slows nerve conduction, which decreases pain signals and enables quicker return to training.
Cold exposure activates the body’s cold shock response, triggering norepinephrine levels to rise sharply – up to 2–3x.
This neurotransmitter is directly linked to focus, alertness, and sustained attention.
Cold immersion trains the autonomic nervous system to handle stress more efficiently.
With repeated exposure, people show:
- Lower cortisol baseline
- Improved mood regulation
- Better adaptability to daily stress
Cold exposure stimulates brown adipose tissue, which:
- Increases calorie burn
- Improves metabolic health
- Supports blood sugar regulation
How we build based on the science
Every True North product is engineered around these principles:
Optimal heat delivery – Fast, stable temperature to trigger cardiovascular and HSP responses.
Optimised airflow – Even distribution of heat for consistent physiological adaptation.
Cold immersion physics – Accurate temperature regulation for reliable cold shock response.
Material performance – Timber, insulation, and components selected for thermal stability and long-term durability.
