Healing Tendon Injuries Using Contrast Therapy: Are Showers or Baths Better?

by Nils Osmar

• © Nils Osmar 2025.  October 27, 2025
• This post is not intended as, and should not be taken as, medical advice. 
• See full Medical Disclaimer

Key Points in a Nutshell:

• Tendon injuries can occur at any age, but as we age, they become more common. Tendon integrity plays a key role in maintaining mobility and independence; supporting tendon health is a key part of healthy aging
• Preventative measures include things like taking collagen and vitamin C, steering clear of repetitive motion injuries, and exercising carefully while being careful not to stress the tendons. But when injuries occur, we need additional interventions.
• For targeted tendon pain (wrist, elbow, ankle): contrast baths have the most evidence to support them; contrast showers have not been studied as deeply, but there is evidence that they can also be useful
• Contrast therapy appears to be most effective when started 48–72h after an acute flare; earlier than that, it may be better to do cold only
• Re: water temperature, many advise staying away from extremes. For example, you might keep the “hot” water warm 38–40 °C (100–104 °F), and keep the cold water around 10–15 °C (50–59 °F) when treating yourself at home. Some bloggers recommend making. the water as hot as it can go without scalding, and adding ice to chill the water further. But be aware that there can be some risks if the temperature is too high or too low.
• Stop if symptoms worsen; see clinician if red flags (below).

Tendon Injuries and the Aging Process

Tendon injuries are an unfortunate fact of life. They can occur at any age but become more common as the years go by because tendons lose elasticity, become stiffer, and have a reduced ability to heal — often because of decreased collagen production. Less collagen make us more susceptible to both acute injuries and chronic overuse issues like tendinopathy. 

There are many ways of treating tendinitis and tendinopathy; proper exercise and nutrition are of course important.. But in this article, I’ll be focusing on contrast therapy.

contrast bath Therapy: alternating heat and cold

Contrast bathing (also called contrast bath therapy or contrast water therapy) is a form of hydrotherapy involving the alternating immersion of a body part— such as a hand, foot, or an entire leg or arm—in hot and cold water. This therapeutic technique has been used in sports medicine, athletic training, and rehabilitation settings for decades, with the goal of improving circulation and reducing symptoms associated with various musculoskeletal conditions.

Some people in the anti-aging community use contrast bath therapy in the belief that they may increasing their testosterone, assisting in the burning of brown fat and supporting mitochondrial biogenesis. This are interesting topic, but they’re beyond the scope of this article. I’ll be focusing here on its use in treading tendon injuries.

My Story

I developed a form of tendinitis recently, and have started taking contrast baths and showers recently as part of an overall strategy for promoting healing. I don’t know yet whether they’re helping, but I can say that (for me) they are relaxing and have some emotional benefits.

How Contrast Therapy Works

The Vascular Pumping Theory

The theory behind contrast bath therapy is that hot water causes vasodilation (widening) of blood vessels, while cold water causes vasoconstriction (narrowing) of blood vessels. By alternating between these two extremes, it is thought that we are creating a “vascular pumping effect” that increases tissue blood flow and oxygenation, potentially improving healing and reducing edema.

What the Research Shows

While the theory sounds compelling, the evidence is more nuanced:

Superficial vs. Deep Tissue Effects:

Research indicates that contrast baths may increase superficial blood flow and skin temperature, though the evidence on impact on edema is conflicting. Importantly, three studies that assessed intramuscular tissue temperatures found that these did not rise significantly after contrast bath procedures, suggesting the effects are primarily superficial rather than deep.

However, it’s important to note that superficial effects can still be therapeutically meaningful. Changes in skin blood flow, surface temperature, and stimulation of nerve endings in superficial tissues can produce real benefits for pain relief, perceived recovery, and comfort—even if deep muscle tissue isn’t directly affected. Therapeutic benefit doesn’t require deep tissue penetration to be valuable.

Blood Flow and Oxygenation:

A 2018 study using near-infrared spectroscopy found that a 30-minute contrast bath protocol altered lower leg intramuscular hemodynamics and oxygenation, with hot water immersion increasing gastrocnemius muscle perfusion and oxygenation, while cold immersion decreased intramuscular oxygenated blood volume.

Overall Evidence Quality:

A comprehensive systematic review examining 28 clinical research articles found that only ten met inclusion criteria, and the diversity of conditions, protocols, and outcomes limited the ability to make definitive conclusions on efficacy. A more recent 2025 scoping review found considerable heterogeneity in treatment protocols and concluded that there is a lack of guidelines for clinical use, with modest study quality preventing clear conclusions about effectiveness.

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What Conditions Can Contrast Bathing Help With?

Post-Exercise Recovery ✅ Some Evidence

Research suggests contrast water therapy is superior to passive recovery or rest after exercise, with pooled data showing significantly greater improvements in muscle soreness at various follow-up time points (under 6 hours, and at 24, 48, 72, and 96 hours) compared to passive recovery.

A Note on Lactic Acid: You may have heard that contrast bathing helps clear lactic acid buildup. This was a common belief based on older studies from the 2000s. However, modern exercise science has moved away from this explanation. We now understand that lactic acid (lactate) clears from muscles quite rapidly after exercise and isn’t actually the primary cause of delayed onset muscle soreness (DOMS). The soreness you feel 1-2 days after exercise is more likely due to microscopic muscle damage and inflammation. While contrast bathing does appear to help with post-exercise recovery and soreness, the mechanism is probably not about lactate clearance.

Pain Relief ✅ Moderate Evidence

A 2025 scoping review of randomized controlled trials found that all studies showed improvement in patients’ initial clinical conditions, with contrast therapy helping to reduce pain (measured by Visual Analogue Scale), improve joint range of motion, and manage swelling.

Swelling and Edema ⚠️ Mixed Evidence

The evidence for edema reduction is contradictory and depends on the condition and timing:

• In a 2016 study involving 115 people with ankle sprains, contrast hydrotherapy lessened swelling around 3 days post-injury
• However, an earlier study comparing cold, heat, and contrast bath treatments found that all three treatments actually produced an increase in edema in post-acute sprained ankles, with cold therapy producing the least edema
• A 2016 randomized trial found that after 3 days of continuous application, contrast therapy reduced swelling in grade I and II ankle sprains, while heat caused increased swelling

Joint Stiffness and Range of Motion ✅ Some Evidence

Warm water immersion in contrast baths has been reported to reduce joint stiffness and increase extensibility of soft tissue, which may benefit individuals with arthritis or recovering from injuries.

Conditions Where It’s Been Studied

The subjects in research studies have been limited primarily to healthy volunteers and patients with rheumatoid arthritis, diabetes, foot/ankle injuries, or sprains, meaning evidence for other conditions is lacking.

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Contrast Showers: An Easier Alternative

What Are Contrast Showers?

Contrast showers involve alternating between hot and cold water while standing in a shower, rather than immersing body parts in separate containers of water. This method offers several practical advantages: it’s more convenient for most people, requires no special equipment, can treat the whole body, and is easier to incorporate into daily routines.

What Does the Research Show?

The research on contrast showers is more limited than for contrast bathing, but there are some important findings:

The Key Study: A 2014 randomized controlled trial published in the Journal of Strength and Conditioning Research examined contrast showers as an alternative to contrast water immersion in elite netball players. The study compared:

• Contrast water therapy (alternating 1 minute at 38°C and 1 minute at 15°C immersion)
• Contrast showers (alternating 1 minute at 38°C and 1 minute at 18°C)
• Passive recovery (seated rest)

Key Findings:

• No significant differences in physical recovery measures (repeated agility performance, core temperature) between any of the three conditions
• Skin temperature was significantly lower immediately after both contrast water therapy and contrast showers compared to passive recovery
• Importantly, overall perceptions of recovery were superior after both contrast water therapy and contrast showers compared with passive recovery

What This Means: While contrast showers may not accelerate measurable physical recovery parameters, they appear to provide meaningful psychological benefits. Athletes felt more recovered, which can be valuable for motivation, confidence, and return to training. The psychological component of recovery should not be dismissed—how we feel about our recovery can influence our performance and adherence to training.

Potential Mechanisms for Contrast Showers

While the evidence is still developing, contrast showers may work through:

• Thermal stress response: Alternating temperatures may stimulate beneficial hormonal responses
• Circulatory effects: Similar vasodilation/vasoconstriction patterns as immersion, though potentially less pronounced
• Psychological benefit: The ritual and sensory experience may promote relaxation and a sense of control over recovery
• Skin-level effects: Direct temperature changes to large areas of skin may stimulate nerve responses

Are Contrast Showers as Effective as Contrast Bathing?

Based on current evidence:

• For targeted treatment of a specific injury (like a sprained ankle or inflamed wrist), contrast bathing with full immersion is likely more effective, as it provides more consistent and sustained temperature changes to the affected area
• For general recovery and psychological benefit after exercise, contrast showers appear to be a reasonable alternative
• For convenience and whole-body application, contrast showers have clear advantages

The choice between methods may depend on your specific goals, available facilities, and what you’re treating.

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When Should Contrast Therapy NOT Be Used? Important Contraindications

Absolute Contraindications 🛑

You should NOT use contrast bathing or contrast showers if you have:

• Cardiac (Heart) Conditions or Angina Pectoris – Contraindications include tendencies for vascular spasms and angina pectoris due to the effects on heart circulation. The sudden expansion and constriction of blood vessels can put additional strain on the heart.
• High Blood Pressure (Hypertension) – Contrast therapy can throw the body’s natural blood pressure regulation out of balance.
• Acute Inflammation (First 72 Hours Post-Injury) – For any injury presenting with palpable swelling, heat, and visible redness—such as a strain or sprain—contrast baths are contraindicated during the acute inflammation stage, which lasts approximately 72 hours from the time of injury.
• Open Wounds or Exposed K-wires – Risk of infection and complications.
• Current Active Infection – Can spread infection or worsen symptoms.
• Peripheral Vascular Disease (PVD) – Contraindications include peripheral vascular disease and impaired sensation.
• Pregnancy – Pregnant people should avoid contrast therapy, and the American College of Obstetricians and Gynecologists recommends avoiding extreme temperatures from hot tubs and saunas during pregnancy.

Use With Extreme Caution:

Just because contrast therapy “works” in some situations does not make it advisable for everyone. For example, extreme care should be taken in people who have the following situations:

Diabetes and Neuropathy:

Individuals with diabetes and neuropathy might possibly benefit from contrast baths if they have good pulses in the extremities, but only a well-trained hydrotherapist or physical therapist should perform this treatment, especially if neuropathy or peripheral vascular disease are present. People with nerve damage might not be attuned to water temperature, putting them at risk of burns or frostbite.

Raynaud’s Disease and Circulation Problems:

People with circulation issues like Raynaud’s disease should avoid contrast therapy because cold exposure can worsen circulation problems.

Reduced Sensation:

If you have reduced ability to detect temperatures, be extremely careful with warm water and do not exceed recommended temperatures or duration.

Pain Exacerbation:

Sometimes varying temperatures can worsen certain pain conditions. If contrast therapy makes your pain or symptoms worse, stop immediately and inform your therapist.

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Optimal Protocol: Temperature, Timing, and Duration

Contrast Bathing Protocol

Water Temperature Recommendations:

The most typical protocol reported in literature uses hot water at 38-40°C (100-104°F) and cold water at 8-10°C (46-50°F). However, protocols vary:

• Warm Water: Typically should range from 38-40°C, and should not exceed 43°C (110°F) to prevent burns
• Cold Water: Typically ranges between 8-10°C, though some protocols use temperatures as warm as 22°C (72°F)

For safe home use without professional supervision, we recommend conservative temperatures:

• Maximum warm temperature: 37°C (99°F)
• Minimum cold temperature: 22°C (72°F)

Timing and Duration:

The most typical research protocol is:

• Initial immersion in hot water for 10 minutes
• Alternated with 1-minute immersion in cold water
• Followed by alternate immersions of 4 minutes in hot and 1 minute in cold water for 3 more repetitions
• Total duration: 30 minutes

Simplified home protocol:

• Warm water: 1-4 minutes
• Cold water: 30 seconds to 1 minute
• Repeat: 4-5 cycles
• Total duration: Approximately 15-30 minutes

Starting and Ending Temperature:

There’s debate about whether to end with hot or cold:

• Most protocols recommend ending with cold to reduce inflammation
• Exception: For rheumatoid arthritis, end in hot water and dry the area thoroughly
• General guideline: End with warm water for comfort. However, if the area feels inflamed, finish with cold water.

Contrast Shower Protocol

Based on the research literature and clinical practice:

Temperature Guidelines:

• Warm/Hot water: 38-40°C (100-104°F) or as warm as comfortably tolerable
• Cold water: 15-18°C (59-64°F) or as cold as available from your tap

Timing:

• Warm water: 3-5 minutes (some protocols use as short as 1 minute)
• Cold water: 30-60 seconds
• Repeat: 3-5 complete cycles
• Total duration: 15-20 minutes

Technique:

• Move around under the water—don’t stand in one place
• Allow water to flow over your entire body or focus on affected areas
• End with cold water (this is a basic hydrotherapy principle)

Frequency:

• Can be performed daily as part of your routine
• For recovery: after exercise or at end of day
• For general wellness: morning or evening

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What You Will Need

For Contrast Bathing

✅ Two large containers (bowls, buckets, or basins large enough for your hand/foot)
✅ Warm water – Bath-temperature warm, not burning (ideally not exceeding 37-40°C)
✅ Cold water – Tap water or with ice cubes (ideally 10-22°C, no cooler than 8°C for therapeutic benefit)
✅ Thermometer (optional but recommended for safety and consistency)
✅ Timer or clock with second hand
✅ Towel for drying

For Contrast Showers

✅ Access to a shower with adjustable temperature control
✅ Timer or waterproof clock
✅ Towel
✅ Warm room (free of drafts) for after treatment

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Step-by-Step:

Contrast Bathing

1. Prepare both containers: Fill one with warm water and one with cold water. Test temperatures with your uninjured hand first.
2. Temperature safety check: If you have nerve injury or reduced sensation, be extra cautious about temperature testing.
3. Start with warm: Immerse your hand/foot in warm water for 1 minute (or up to 4 minutes for longer protocols).
4. Switch to cold: Immediately move to cold water for 30 seconds to 1 minute.
5. Repeat the cycle: Alternate between warm and cold for at least 4-5 complete cycles.
6. Movement (if advised): If your therapist recommends it, gently move your fingers or toes while immersed.
7. End appropriately:
   • Standard: End with cold water
   • Rheumatoid arthritis: End with warm water
   • Active inflammation: End with cold water
8. Frequency: Can be performed 3-4 times per day as tolerated.
9. Temperature maintenance: Add hot water (carefully stirred) or ice as needed to maintain consistent temperatures throughout the session.

Contrast Showers

1. Prepare: Ensure the bathroom is warm and free of drafts.
2. Begin with warm: Start with water as warm as your skin will comfortably allow (38-40°C / 100-104°F) for 3-5 minutes.
3. Switch to cold: Turn the water to cold (15-18°C / 59-64°F) for 30-60 seconds. Move around vigorously under the water.
4. Repeat cycle: Alternate between hot (3-5 minutes) and cold (30-60 seconds) for at least 3 complete cycles.
5. End with cold: Always finish on cold water. This allows your body to warm up to room temperature rather than cooling down after heat.
6. Dry and rest: Towel-dry thoroughly and dress to stay warm. For maximum benefit, rest in a reclined position for 20 minutes.

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Important Safety Considerations

🌡️ Temperature monitoring: The limb or body becomes desensitized after being in cold water, making it difficult to detect if the hot water is too hot. Always test carefully.

🏠 Room temperature: The treatment room should be warm and free of drafts, as cool room temperatures make contrast therapy less effective.

📊 Timing matters: Contrast therapy should not be done to an acute injury until 72 hours have passed since the injury.

⚠️ Listen to your body: If you feel lightheaded, dizzy, or unwell at any point, stop immediately and exit the water.

💧 Stay hydrated: Drink water before and after treatment, especially with contrast showers, as the treatment can affect blood pressure.

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Should You Try Contrast Therapy?

I can’t say yes or no. The answer is up to you and your healthcare provider. There is strong evidence that contrast therapy:

• May help with: Post-exercise muscle soreness, pain relief, improving range of motion, psychological perception of recovery
• Mixed evidence for: Reducing edema/swelling (depends on condition and timing)
• Not well-supported for: Deep tissue effects, acute injury management (first 72 hours)

Contrast Bathing vs. Contrast Showers: Which to Choose?

Choose contrast bathing when:

• You need targeted treatment for a specific injury or joint
• You want maximum temperature contrast
• You’re following a rehabilitation protocol prescribed by a therapist
• You have a localized condition (sprained ankle, inflamed wrist, etc.)

Choose contrast showers when:

• You want whole-body treatment
• Convenience and ease of use are important
• You’re using it for general recovery after exercise
• You want to incorporate it into daily routine
• You value the psychological benefits of the practice
• Note: one important difference between contrast bathing and contrast showers is that it’s easier to be sure of the temperature of the water when bathing. If you’re switching from hot to cold, adjusting the temperature based on how the water feels may be misleading. Cold can have a numbing effect, for example, and make us less aware of what temperature the water is when we turn the shower to “hot” again. This creates a possibility of being burned if we’re not careful and attentive.

Both methods can be valuable, and your choice may depend on your specific needs, goals, and circumstances.

When to Consider Contrast Therapy

• Post-exercise recovery
• Chronic joint stiffness (after inflammation has resolved)
• Pain management in musculoskeletal conditions
• Under guidance of a physical therapist or occupational therapist

When to Avoid It

• First 72 hours after acute injury
• If you have any of the contraindicated conditions listed above
• If it makes your symptoms worse

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Recommendations

1. Consult your healthcare provider before starting contrast therapy, especially if you have any medical conditions
2. Work with a therapist initially to learn proper technique
3. Monitor your response – if pain or swelling worsens, discontinue use
4. Be conservative with temperatures at home (maximum 37°C warm and minimum 22°C cold is sensible for bathing; adjust as comfortable for showers)
5. Consider it as part of a comprehensive treatment plan, not a standalone cure
6. Pay attention to the psychological benefits – if contrast therapy helps you feel better and more recovered, that has real value even if physical measurements don’t show dramatic changes

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Key References

This article draws from these major sources:

• Breger Stanton et al. (2009). Systematic review of contrast bath effectiveness in Journal of Hand Therapy
• Khoshnevis et al. (2018). Contrast baths and intramuscular hemodynamics study using near-infrared spectroscopy in Journal of Athletic Training
• Bieuzen et al. (2013). Contrast water therapy and exercise-induced muscle damage meta-analysis in PLOS ONE
• Luca et al. (2025). Mechanisms and efficacy of contrast therapy scoping review in Journal of Functional Morphology and Kinesiology
• Weerasekara et al. (2016). Contrast therapy in ankle sprains in Foot & Ankle Specialist
• Ingram et al. (2014). Influence of contrast shower and water immersion on recovery in elite netballers in Journal of Strength and Conditioning Research

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Note: This article is for informational purposes only and is not intended as it should not be taken medical advice. Always consult with a qualified healthcare provider before beginning any new treatment.

About This Article

I have a type of tendinitis which causes me some discomfort and makes it hard to work sometimes; I’ve been exploring treatments for it. This led me to learning more about contrast therapy — the use of hot and cold temperature to treat the symptoms of tendinitis and other conditions.

I had to tried contrast showers years before for other reasons, but I wanted to make sure the information about their application to problems such as tendion injuries was accurate. I found some articles online that were helpful, but also some that repeated outdated information that is longer considered accurate. So I decided to write an article exploring the topic in depth for others who might benefit from it

This article went through several stages. I started out with an original draft covering the basics in a loose general away. I then showed it. to Claude.ai, asking them to make sure that what I had written was accurate (and that their own contributions were not hallucinated, a problem that can occur sometimes with LLM’s.)

I should remind people again that I’m not a medical professional. Nothing in this article is intended or should be taken as medical advice.

Not medical advice

This article is not intended as, and should not be taken as, medical advice. I’m not advising that people eat any particular diet or take any particular supplement(s), just reporting on what I’m doing. Supplements, like medications and other interventions, can have side effects; I would encourage people to research both possible benefits and side effects before starting on any supplementation regimen, and consult with a medical professional about any issues which might have a medical component.  See full Medical Disclaimer

Other resources

• My Youtube channel Pathways to Longevity
• My Facebook group: Anti-Aging and Life Extension, 

About the Author

Medical Disclaimer