Cold water immersion does help with sore muscles, and the evidence is fairly strong. A large network meta-analysis of 55 randomized controlled trials found that soaking in cold water for 10 to 15 minutes significantly reduces delayed onset muscle soreness, lowers markers of muscle damage in the blood, and improves jump performance afterward. But there’s an important catch: if you’re trying to build muscle, cold water right after a strength workout can blunt your long-term gains.
How Cold Water Reduces Soreness
When you sit in cold water, your blood vessels constrict and blood flow to your muscles drops. This slows the metabolic activity in damaged tissue, which limits the cascade of swelling and inflammation that causes that deep, achy soreness a day or two after hard exercise. Cold also reduces nerve conduction velocity, meaning pain signals travel more slowly from your muscles to your brain. The combined effect is that you feel less sore and can move more freely in the hours and days after a tough workout.
The soreness cold water targets is specifically delayed onset muscle soreness (DOMS), the stiffness and tenderness that peaks 24 to 72 hours after exercise. Cold water immersion at 50°F (10°C) for 10 minutes has been shown to produce effective recovery at the 72-hour mark. Neuromuscular performance also improves for up to 24 hours after a cold soak, though the benefit doesn’t extend much beyond that window.
The Best Temperature and Duration
Not all cold water soaks are equal. Research categorizing different protocols by temperature and duration found two clear winners:
- For reducing soreness: 10 to 15 minutes at 52°F to 59°F (11°C to 15°C). This moderate cold range was the most effective protocol for lowering perceived muscle soreness.
- For reducing muscle damage markers and restoring power: 10 to 15 minutes at 41°F to 50°F (5°C to 10°C). This colder range was best for biochemical recovery and restoring jump performance.
Sessions shorter than 10 minutes or warmer than 68°F (20°C) showed weaker effects. Going longer than 15 minutes didn’t add much benefit and becomes harder to tolerate. The American College of Sports Medicine offers two practical options: either a single 11- to 15-minute soak at 52°F to 59°F, or two 5-minute soaks at 50°F with a 2-minute break at room temperature between them. Both have been studied enough to support their use.
If you don’t have a thermometer, water from your cold tap in most homes runs around 55°F to 65°F. Adding a bag or two of ice to a bathtub of cold tap water will bring you into the effective range.
The Tradeoff With Muscle Growth
This is where cold water gets complicated. The same cooling that eases soreness also interferes with the signals your muscles need to grow. A study published in the Journal of Physiology found that cold water immersion after strength training attenuated long-term gains in both muscle mass and strength. The mechanism is straightforward: by reducing blood flow, cold water limits the delivery of amino acids to your muscles and suppresses the protein-building pathways that drive adaptation. It also blunts the activity of satellite cells, which are the repair cells that fuse with damaged muscle fibers to make them bigger and stronger. These effects persisted for up to two days after a single strength session.
Over weeks and months of training, those small disruptions compound. If your primary goal is getting stronger or building muscle, routine cold water immersion right after lifting is counterproductive. You’re essentially treating the inflammation that your body needs to trigger growth.
The ACSM suggests a practical workaround: delay cold water exposure for four to six hours after strength training. This gives your muscles time to initiate the repair and growth process before you cool them down. Another option is to take your cold soak early in the morning, well before your workout. Cold exposure triggers a release of stimulating neurochemicals like dopamine and norepinephrine, which can boost alertness and mood without interfering with strength gains later in the day.
Cold Water vs. Heat for Sore Muscles
Heat therapy also helps with sore muscles, but the two work differently. In a study of 100 subjects, both cold and heat applied immediately after exercise preserved about 96% of muscle strength, compared to greater losses in the control group. Both also prevented significant damage to elastic tissue when used right after exercise. The key difference was pain: cold was superior to heat for reducing soreness both immediately after exercise and when applied 24 hours later. Cold at the 24-hour mark was also better than heat for strength recovery.
Heat tends to increase blood flow and relax tight muscles, making it useful for chronic stiffness or tension. Cold is better suited for acute soreness after intense or unfamiliar exercise, where limiting inflammation is the priority. Using both in sequence, sometimes called contrast therapy, is another approach, though the evidence for it is less clear-cut than for cold alone.
When Cold Water Can Be Risky
Cold water immersion triggers two competing reflexes in your body. The cold shock response fires when cold hits your skin, causing a spike in heart rate, a sharp gasp, uncontrollable rapid breathing, and a sudden rise in blood pressure. The diving response activates when cold water contacts your face and nostrils, which slows the heart and redirects blood to vital organs. These two responses pulling in opposite directions can create dangerous cardiac arrhythmias in vulnerable people.
The greatest risks are cardiovascular. People with heart disease, uncontrolled high blood pressure, Raynaud’s disease, sickle cell disease, or diabetes should avoid cold immersion or get medical clearance first. Age, body composition, and experience also matter. If you’ve never done a cold soak, start with warmer water (closer to 59°F) and shorter durations, then work your way colder as your body adapts. Never submerge alone, especially in natural bodies of water where the temperature may be colder than expected.
When It Makes Sense to Use Cold Water
Cold water immersion is most useful in specific situations. During competition periods or tournament weekends when you need to recover quickly between events, a 10- to 15-minute soak can meaningfully reduce soreness and restore some explosive power. After endurance sessions, long runs, or high-volume conditioning work where hypertrophy isn’t the goal, cold water helps without a meaningful downside. It’s also reasonable after a particularly brutal workout that leaves you dreading the next two days.
Where it makes less sense is as a daily habit after every strength training session. The short-term comfort comes at the cost of long-term adaptation. If you’re in an off-season phase focused on building size and strength, either skip the cold plunge, push it to a different time of day, or save it for rest days. The soreness you feel after lifting is part of the process, and blunting it consistently means blunting your results.