If the idea of an ice-bath or cold shower sends shivers (or fear or excitement) down your spine, then we need to differentiate between the hype of cold and the actual science and strategy.
Elite athletes aren’t jumping into ice baths “because it feels hardcore.”
They are strategic.
They match the tool to the phase of training and performance (and life) goals.
We know that cold exposure can:
activate brown fat (hello increased metabolism)
regulate insulin sensitivity
support muscle growth and longevity
But how and when to use cold is more nuanced.
It’s not a one-size-fits-all. Recovery, adaptation, endurance, fat burning, and longevity are not the same goal.
Different biological signals are sent and your body responds accordingly.
Let’s break it all down.
The Core Physiology
Cold = Recovery + Resilience Tool
How cold? XY-chromosome people react differently than XX-chromosome people. (XY are often primary testosterone producers and previously referred to as “men”. Whereas XX are often primary estrogen producers and previously referred to as “women”.)
Ice cold is too cold is you’re main hormone is estrogen. This temperature causes a severe constriction and shutdown of the system - because it's a huge stress! We’re better off to focus on 16C. This temperateure offsets the severe constricitons but cold enough to elicit the positive effects of cold exposure.
Cold exposure:
Reduces soreness and perceived fatigue
Improves short-term performance readiness
Increases norepinephrine 200–500%
Increases dopamine
Improves alertness and pain tolerance
Activates brown adipose tissue
Improves insulin sensitivity and metabolic flexibility
Acts as a “good stress” that strengthens autonomic nervous system resilience (1)
But here’s the edge:
Regular cold immersion after strength training can reduce muscle growth.
How does the cold have a negative effect?
Suppresses mTOR signaling
Reduces the inflammatory cascade needed for adaptation
Decreases muscle stem cell (satellite cell) activity
May impair long-term strength gains when used frequently
However - ya, it's never a black and white science discussion.
Local cold wrapped on a muscle after resistance exercise may NOT significantly disrupt early gene signalling for muscle adaptation. (2)
Cold immersion (full-body) can “short-circuit” the adaptive stress signal that drives hypertrophy.
Cold improves short-term performance.
It does not build muscle.
Competition / High-Volume Blocks
Goal: Recover fast. Perform again tomorrow – and the day after
This is where cold shines.
Use cold when:
You have multi-day competition like tournament play
Back-to-back high output sessions
Short turnaround between efforts
Cold helps:
Reduce soreness
Lower perceived fatigue
Improve performance readiness
Increase norepinephrine for focus
Here, performance is MORE important than adaptation.
Elite athletes shift tools when the goal shifts.
Endurance & Aerobic Training
Goal: Aerobic capacity, mitochondrial efficiency.
Cold does not appear to impair aerobic adaptations.
Endurance relies less on inflammatory hypertrophy signaling.
Cold may:
Support recovery between sessions
Improve mitochondrial efficiency
Help maintain training volume
Cold can be used more liberally here — especially in high mileage phases.
Fat Burning & Metabolic Health
Goal: Improve metabolic flexibility.
Cold exposure:
Activates brown adipose tissue
Improves insulin sensitivity
Enhances metabolic efficiency
This is a systemic effect — not a muscle-building effect.
Use strategically. Not compulsively.
Longevity & Resilience
Goal: Nervous system resilience and capacity. Stress tolerance.
Cold is a “good stress”.
It strengthens:
Autonomic nervous system regulation to balance sympathetic and parasympatethic responses
Stress response capacity
Mental resilience
Side note – You can also consider heat here to support:
Cardiovascular health
Adaptation signaling
Longevity physiology
Both can fit here.
It depends on what you’re trying to stimulate.
Practical Protocols For Using Cold
🔥 For Muscle & Strength Gains
• Do NOT cold plunge immediately post-lift
• Wait 4–6 hours minimum if using cold
• Avoid daily post-lift cold during hypertrophy blocks
❄️ For Competition Recovery
• Use cold immediately post-event
• 5–10 minutes immersion
• For XX-chromosome (female) don’t go colder than 16C. For XY (male) go for the icy cold.
• Especially useful in multi-day events, tournaments
• Prioritize performance over adaptation
❄️ For Endurance Blocks
• Cold post-session acceptable
• Especially during high-volume phases
• Focus on maintaining training frequency
🔥 For Longevity
• Regular heat exposure
• Strategic cold exposure for resilience
The Athlete Mindset
Cold is not “hardcore.”
The question is not:
“Is cold good or bad?”
The question is:
“What signal am I trying to send my body right now?”
Olympic and elite athletes don’t act ad hoc.
They periodize stress.
You should too.
If you’re unsure which phase you’re in —
adaptation, recovery, endurance, metabolic reset —
that’s where strategy comes in.
Recover with intention.
References
Dr. Andrea Proulx, ND — helping female athletes crush fatigue, fix their hormones, and finally perform like the athlete they know they are. Read full bio