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Best Red Light Therapy Belts for Back and Core

By Dr. Alex Romano · Photobiomodulation Researcher & Editor, Red Light Finder

Updated May 2026

April 12, 2026 · 21 min read

Last updated: April 2026

Disclaimer: This article is for informational purposes only and does not constitute medical advice. Consult a qualified healthcare provider before starting any treatment.

Affiliate Disclosure: We may earn a commission when you purchase through our links. This does not affect our editorial independence.

Quick Answer

  • The Infraredi Max 2021 offers 210 x 5 Watt LEDs, with 105 LEDs using the 660nm wavelength and 105 LEDs using the 850nm wavelength.
  • The Joovv Solo 3.0, released in late 2020, has a peak power output of 74 mw/cm2 according to Alex Fergus's tests.
  • The Infraredi Max 2021 tested at zero EMF at a 10 cm treatment distance, a key factor for user safety.
  • Mito Red Light has over 100,000 customers and a 4.8/5 rating from over 2,500 reviews, showing strong customer satisfaction.

When looking for red light therapy devices for back and core, many factors come into play, including price, power, and features. Our analysis often compares models like the Infraredi Max 2021 and the Joovv Solo 3.0, which are popular full-body panel devices. These panels, while not specifically belts, offer insight into the technology and performance you might expect from similar, more localized devices. For instance, the Infraredi Max 2021 is priced at $899 USD, but with an expert's discount code, this drops to $809 USD, making it a more accessible option compared to some competitors. Mito Red Light also stands out with feature-rich devices such as the Mito Mobile Super. Understanding the technical specifications and value propositions of these leading devices helps consumers make informed choices for their specific needs.

What are the top red light therapy devices for back and core?

When we look for the best red light therapy devices for treating the back and core, we often find ourselves comparing full-body panel devices. These panels provide a comprehensive view of what advanced red light therapy technology offers, even if a user is looking for a more localized "belt" type of device. Two models frequently come up in our discussions: the Infraredi Max 2021 and the Joovv Solo 3.0. These devices represent significant options for those seeking effective light therapy at home or in a commercial setting. They set a benchmark for features, performance, and overall value in the market.

The Joovv Solo 3.0, for example, is available at a current price of $1,699.00, which is a reduction from its original price of $1,799.00. This pricing positions it as a premium option in the market. It was released in late 2020 and has since been updated, with its review being updated in 2024. Joovv has a long history in the red light therapy space, with their first Joovv Solo device being a pioneering entry in 2017. The brand is known for being a trendsetter in the industry, often introducing improvements and new features to red light therapy panels. Their devices are designed for convenient moderate-area treatments, making them suitable for various body parts, including the back and core.

In contrast, the Infraredi Max 2021 offers a different value proposition. It is priced at $899 USD. This price point is considerably lower than the Joovv Solo 3.0. Furthermore, an expert's discount code can reduce the Infraredi Max 2021's price by an additional 10%, bringing the final cost down to $809 USD. This means the Infraredi Max is $840 cheaper than the Joovv Solo when comparing these discounted prices, making it a more budget-friendly choice for many users. The Infraredi Max 2021 does not charge extra for taxes, which simplifies the final cost for consumers. This significant price difference highlights the varied options available in the market.

Beyond these two prominent panel devices, other companies like Mito Red Light also offer compelling options. Mito Red Light is known for its feature-rich devices, such as the Mito Mobile Super. This device is described as one of the most feature-packed red light therapy devices Alex Fergus, a red light therapy expert, has ever used. Mito Red Light boasts a strong customer base, with over 100,000 customers and an "Excellent" rating of 4.4 out of 5 on Trustpilot, based on 743 reviews. Their website also shows a 4.8/5 rating from over 2,500 reviews, indicating high customer satisfaction. These devices are often HSA/FSA eligible and come with free US shipping for the lower 48 states, along with a 60-day money-back guarantee. The MitoPRO+ panel series, for instance, starts at $369.00 and has a rating of 4.7 out of 5 stars. The availability of financing options also makes these devices more accessible to a broader audience.

When considering a device for back and core treatment, the underlying technology of these full-body panels can inform our understanding. Both Joovv and Infraredi models use a combination of red and near-infrared light, which are key wavelengths for stimulating cellular energy, reducing joint pain and inflammation, relaxing sore muscles and joints, and increasing blood flow. These are benefits directly relevant to back and core issues. The modular design of some devices, like the Joovv Solo 3.0, allows for expansion into larger setups, offering flexibility as treatment needs evolve. This modularity means that a single panel could be used for targeted areas like the back or core, and then later integrated into a larger system for full-body coverage.

Ultimately, the best choice depends on individual needs, budget, and desired features. For those prioritizing cost-effectiveness without sacrificing performance, the Infraredi Max 2021 presents a strong case. For users who value extensive features, strong branding, and a well-engineered experience, the Joovv Solo 3.0 or devices from Mito Red Light might be more appealing. Each of these companies brings different strengths to the red light therapy market, providing a range of choices for consumers.

How do shipping and warranty compare?

When investing in a red light therapy device for your back and core, understanding the shipping policies and warranty periods is crucial. These factors can significantly impact the overall cost of ownership and provide peace of mind regarding your purchase. Different manufacturers offer varying terms, and comparing them helps in making an informed decision. Our analysis shows clear differences between leading brands like Joovv and Infraredi regarding these logistical and support aspects.

For the Joovv Solo 3.0, shipping costs are an additional expense that customers need to consider. The shipping fee can range from $50 to $150, depending on the specific shipping location. This means that the total cost of the device, which is currently $1,699.00, will be higher once shipping is factored in. Joovv also provides a 2-year warranty with their Solo device. This warranty period covers potential defects or issues that might arise during the first two years of ownership, offering some protection for the investment. Joovv aims to ship orders within 5 business days, ensuring a relatively prompt delivery after purchase.

In contrast, Infraredi offers more generous terms for shipping and warranty with their Infraredi Max 2021 device. The Infraredi Max 2021 comes with free express shipping worldwide. This eliminates any additional shipping costs, making the final price of $899 USD (or $809 USD with a discount code) the true cost to the consumer. The absence of shipping fees is a distinct advantage, especially for international buyers or those looking to minimize overall expenses. Beyond shipping, Infraredi provides a 3-year warranty with their Max device. This extended warranty period offers an extra year of coverage compared to Joovv, suggesting a higher level of confidence in their product's durability and longevity. A longer warranty can be a significant benefit, as it extends the period during which repairs or replacements due to manufacturing defects are covered, providing greater security for your purchase.

When we consider the total value, these shipping and warranty differences contribute to the overall appeal of each device. For instance, the Infraredi Max's free express shipping and longer 3-year warranty add considerable value to its already lower price point. This can be particularly appealing for users who are budget-conscious but still seek reliable and well-supported red light therapy solutions. The peace of mind that comes with a longer warranty can be invaluable, especially for electronic devices that are used regularly for therapeutic purposes.

The policies around shipping and warranty reflect a company's commitment to customer service and product quality. A company offering free worldwide shipping demonstrates a global reach and a desire to make its products accessible without hidden costs. Similarly, a longer warranty period often indicates that the manufacturer stands by the quality and construction of their devices. For consumers researching red light therapy belts or panels for their back and core, these aspects are just as important as the technical specifications. They ensure that the device not only performs well but also comes with robust support and a clear path for assistance if needed. The choice between a 2-year or 3-year warranty, coupled with varying shipping costs, can be a deciding factor for many.

What about LED count and wavelengths?

The effectiveness of a red light therapy device, particularly for areas like the back and core, largely depends on its LED count and the specific wavelengths of light it emits. These technical specifications dictate the power and depth of penetration of the light, directly influencing the therapeutic outcomes. Devices typically use a combination of red light and near-infrared (NIR) light, each with distinct benefits. Our detailed comparison reveals how different models leverage these elements to deliver their therapeutic effects.

The Joovv Solo 3.0, for example, is equipped with 150 x 3 Watt LEDs. This configuration means it has a total of 150 individual light-emitting diodes, each rated at 3 watts. These LEDs are specifically divided to provide a balanced spectrum of light. In the Joovv Solo 3.0, 75 LEDs use the 660nm wavelength, which falls within the red light spectrum. The other 75 LEDs use the 850nm wavelength, which is in the near-infrared spectrum. This combination is crucial because red light (660nm) is generally absorbed by the skin and superficial tissues, making it beneficial for skin health, collagen production, and surface-level inflammation. Near-infrared light (850nm), on the other hand, penetrates deeper into the body, reaching muscles, joints, and bones, making it ideal for muscle recovery, joint pain relief, and deeper tissue regeneration—perfect for back and core therapy. Additionally, the Joovv Solo 3.0 includes a pulsing function of 10hz specifically for the 850nm wavelength. This pulsing feature can be beneficial for recovery and performance, as some research suggests that pulsed light may enhance certain biological responses compared to continuous wave light.

In comparison, the Infraredi Max 2021 features a higher LED count and wattage per LED. This device comes with 210 x 5 Watt LEDs. This means it has 60 more LEDs than the Joovv Solo 3.0, and each LED is more powerful. Similar to Joovv, these LEDs are split between the two key therapeutic wavelengths. The Infraredi Max 2021 has 105 LEDs using the 660nm wavelength and another 105 LEDs using the 850nm wavelength. The greater number of higher-wattage LEDs suggests a potentially more intense and widespread light delivery across the treatment area. However, it is worth noting that the Infraredi Max 2021 device does not come with a pulsing function built-in. Infraredi has addressed this in their newer Flex Max device, which now includes a pulsing function among other new technologies and features. The absence of a pulsing function in the Max 2021 might be a consideration for users who specifically seek this feature for enhanced recovery or performance benefits. For more details, see Infraredi Max vs Joovv Solo comparison.

The choice between 3-watt and 5-watt LEDs also impacts the overall power output and the resulting therapeutic effects. Higher wattage LEDs can deliver more light energy per diode, potentially leading to shorter treatment times or more potent effects. The distribution of LEDs across the red and near-infrared spectrum is also a critical design choice. A balanced distribution ensures that both superficial and deep tissues receive optimal light exposure. For targeting the back and core, the deep penetration of 850nm near-infrared light is particularly important for addressing muscle soreness, joint stiffness, and deeper pain. Red light at 660nm can still provide benefits to the skin and connective tissues in these areas, contributing to overall tissue health.

Understanding these specifications helps consumers appreciate the engineering behind each device. The number of LEDs, their individual wattage, and the specific wavelengths (660nm and 850nm) are fundamental to how effectively a device can deliver red light therapy. The inclusion or exclusion of features like a pulsing function also adds another layer of consideration for those looking to maximize their recovery and performance outcomes. When selecting a device, especially for targeted use on the back and core, evaluating these technical details is essential for aligning the device's capabilities with personal therapeutic goals.

How do irradiance and power output differ?

Understanding irradiance and total power output is fundamental to evaluating the effectiveness of red light therapy devices, especially for deep tissue treatment in the back and core. These metrics quantify how much light energy a device delivers and how intensely it does so. While often discussed together, they measure different aspects of light delivery. In our analysis, we rely on expert testing, such as that conducted by Alex Fergus, to provide concrete comparisons between devices like the Joovv Solo 3.0 and the Infraredi Max 2021.

Irradiance measures the power output of light over a specific area, typically expressed in milliwatts per square centimeter (mw/cm2). It tells us how concentrated the light energy is at a certain distance from the device. Higher irradiance generally means more light energy reaching the target tissue, potentially leading to more efficient or effective treatments. Alex Fergus's test of the Joovv Solo 3.0 showed it gave a peak power output, or irradiance, of 74 mw/cm2. This figure represents the maximum intensity of light delivered by the device at a specific point. For treatments on the back and core, sufficient irradiance is vital to ensure that enough light penetrates through layers of skin and muscle to reach the underlying tissues and cells.

Total wattage output, on the other hand, describes the overall electrical power consumed by the LEDs to produce light. It reflects the device's capacity to convert electrical energy into light energy. While not a direct measure of light reaching the skin, it provides an indication of the device's raw power. In Alex's calculations, the Joovv Solo 3.0 showed a total wattage output of 85 watts. This figure helps us understand the scale of the device's light-emitting capabilities. Joovv emphasizes that there are two ways to evaluate light power from a light therapy device: radiant flux (total light output) and irradiance. They state that radiant flux measures the maximum light-emitting capability of a device, or how it converts electrical power into light energy. This measurement requires an integrated sphere measuring device, and the common unit for radiant flux is milliwatts (mW) or watts (W) The Truth About Power and Misleading Claims | Joovv.

When we turn to the Infraredi Max 2021, our comparisons show it delivers a higher peak power output. The Infraredi Max gave a peak power output of 76.8 mw/cm2. This is slightly higher than the Joovv Solo 3.0, indicating a marginally more intense light delivery at its peak. Furthermore, the total wattage output calculation for the Infraredi Max showed 97.5 watts. This is a noticeable increase compared to the Joovv Solo 3.0's 85 watts, suggesting that the Infraredi Max converts more electrical power into light energy overall. The higher total wattage aligns with its specification of having 210 x 5 Watt LEDs, compared to Joovv's 150 x 3 Watt LEDs.

These differences in irradiance and total power output are significant for users seeking optimal therapeutic benefits for their back and core. Higher irradiance means that cells receive a more concentrated dose of light, which can potentially accelerate cellular processes like energy production and repair. A higher total wattage output indicates a more powerful device capable of covering a larger area with therapeutic light, or delivering a stronger dose to a specific, localized area. For example, when treating a broad area like the lower back, a device with higher total wattage might provide more uniform coverage. Alex Fergus noted that the Joovv Solo 3.0 has "Quite decent power output, that's up there with a few other panels. The power output of the Joovv Solo 3.0 has also massively improved since the previous generation." This highlights Joovv's continuous efforts to enhance their devices, even if other models now surpass them in certain metrics. When we compare the numbers, the Infraredi Max 2021 shows a slight edge in both peak irradiance and total wattage, which could be a deciding factor for some users.

Is EMF a concern with red light therapy devices?

Electromagnetic Field (EMF) levels are a growing concern for many consumers when choosing electronic devices, and red light therapy units are no exception. Users often want to know if their chosen device emits high levels of EMF, which some believe could have health implications. When we evaluate red light therapy devices for areas like the back and core, assessing their EMF output is an important part of a comprehensive review. Different manufacturers approach EMF management in various ways, leading to significant differences in reported levels.

According to Alex Fergus's review, the Joovv Solo had quite a high EMF level when he tested it. This finding raised concerns for some users. However, Alex Fergus also noted that he has since heard that Joovv may have reduced these EMF levels since his last test. He did not re-test the EMF levels in his most recent review, so specific, updated figures for the Joovv Solo 3.0 are not available from his testing. This situation highlights the dynamic nature of product development, where manufacturers can make improvements to address consumer feedback and technical concerns. While Joovv devices offer health benefits such as stimulating cellular energy, reducing joint pain and inflammation, and increasing blood flow, the historical EMF readings are a point of consideration.

In stark contrast, the Infraredi Max 2021 has been designed with EMF reduction as a key priority. Our analysis, based on Alex Fergus's testing, confirms that the Infraredi Max 2021 has Zero EMF at the desired treatment distance of 10 cm's. This is a significant advantage for users who are particularly sensitive to or concerned about EMF exposure. Achieving zero EMF at a practical treatment distance provides reassurance that users can enjoy the therapeutic benefits of red light therapy without worrying about potential electromagnetic interference. For treatments on the back and core, where the device is often placed in close proximity to the body for extended periods, this zero EMF rating is a strong selling point.

The concept of "desired treatment distance" is important here. It means that at the recommended distance for using the device, the EMF output is negligible or non-existent. This indicates that the engineering and design of the Infraredi Max 2021 specifically address this concern, providing a safer user experience. High EMF levels can be a deterrent for some individuals, and manufacturers who actively work to minimize them demonstrate a commitment to user well-being. The difference between a device that historically had "quite high" EMF levels and one that registers "Zero EMF at 10 cm's" is substantial and can be a deciding factor for many health-conscious consumers.

While the exact health impacts of low-level EMF exposure are still a subject of ongoing research, many people prefer to minimize their exposure whenever possible. For red light therapy, which involves direct and often close contact with the body, ensuring low or zero EMF is a feature that adds considerable value. When choosing a device for persistent back pain or core recovery, knowing that the equipment has been tested and confirmed to have zero EMF at the recommended treatment distance can significantly enhance user confidence and peace of mind. This factor alone might lead some users to prefer devices like the Infraredi Max 2021 over others, especially if they are looking for the purest biohacking experience.

What is the value per LED and per Watt?

When evaluating red light therapy devices for back and core treatment, looking beyond the initial price tag to understand the "value per LED" and "value per Watt" provides a much clearer picture of cost-effectiveness. These metrics help consumers understand how much they are paying for the core components that deliver the light therapy. Our analysis consistently uses these calculations to help users identify which devices offer the best bang for their buck. Alex Fergus, a respected expert in the field, utilizes these figures in his reviews to provide an unbiased comparison.

Let's break down the value for the Joovv Solo 3.0 first. Based on its pricing and specifications, the Joovv Solo 3.0 costs $10 per LED. This figure is derived by dividing the device's price by its total number of LEDs. With 150 x 3 Watt LEDs, each LED carries a significant portion of the overall cost. When we look at the value per Watt for the Joovv Solo 3.0, the cost is $17.60 per Watt. This calculation is based on the total wattage output of the device, which was measured at 85 watts in Alex Fergus's tests. These numbers indicate that Joovv devices, while offering great branding, app integration, and innovative features, come at a higher cost per unit of light-emitting capability. Alex Fergus has noted that Joovv's high price results in low value by the metrics he uses, stating that "You pay a much higher price per Watt and LED than with other panels from other companies." This points to Joovv's premium market positioning, where factors beyond raw power, such as design and user experience, contribute to the price. For more details, see Mito Red Light customer reviews.

Now, let's compare this to the Infraredi Max 2021. The Infraredi Max 2021 stands out with a significantly lower cost per LED. It costs $3.85 per LED. This is substantially less than the Joovv Solo 3.0, indicating that you get more light-emitting diodes for your money. Given that the Infraredi Max 2021 has 210 x 5 Watt LEDs, this low per-LED cost makes it a very attractive option for those seeking maximum LED density without a prohibitive price. When we consider the value per Watt for the Infraredi Max 2021, the cost is $8.30 per Watt. This figure is also considerably lower than the Joovv Solo 3.0's $17.60 per Watt. The Infraredi Max's total wattage output was measured at 97.5 watts, further highlighting its efficiency in converting cost into power. The price difference between the two devices is substantial, with the Infraredi Max being $840 cheaper than the Joovv Solo when considering Alex's discount. This makes the Infraredi Max a compelling choice for consumers prioritizing cost-effectiveness and raw power output.

These value calculations are crucial because they cut through marketing claims and provide a tangible way to compare the inherent worth of a device's light delivery system. For treatments on the back and core, where consistent and powerful light delivery is key, getting more LEDs and more wattage for your investment can translate to better results over time. A lower cost per LED and per Watt means that the device is more efficient in its pricing strategy relative to its core function. It helps consumers understand if they are paying for advanced features and brand recognition, or for the sheer power and quantity of light emitters.

In summary, when we understand these figures, we can do some value calculations to figure out how much you pay based on a dollar per LED figure, and dollar per Watt figure. The Infraredi Max 2021 clearly offers a better value proposition in terms of dollar per LED and dollar per Watt compared to the Joovv Solo 3.0. This makes it a strong contender for those looking for high performance at a more accessible price point, particularly for consistent use on the back and core where robust light delivery is a priority.

What are the benefits of Joovv devices?

Joovv devices, including the Joovv Solo 3.0, are designed with a focus on convenience, innovation, and a premium user experience, offering a range of health benefits relevant for targeting areas like the back and core. Joovv has been a significant player in the red light therapy space since 2017, consistently setting trends and improving their panel designs. Their approach combines effective light therapy with user-friendly features and a strong brand presence.

One of the primary advantages of Joovv devices is their design for convenient moderate-area treatments. This makes them highly versatile for use on specific body parts, such as the back, lower back, or abdominal core, where targeted therapy is most beneficial. The Joovv Solo 3.0 is part of Joovv’s patented modular system, which means it can be expanded into larger setups. This modularity is a key feature, allowing users to start with a single Solo device for localized treatments and later add more panels to create a larger, full-body system as their needs or budget evolve. This flexibility is a significant benefit for long-term users.

Joovv devices emit both red and near-infrared light, which are the two primary wavelengths used in photobiomodulation. These specific wavelengths are designed to reduce pain, relax muscles and joints, and increase blood circulation. These benefits are particularly relevant for individuals experiencing discomfort or seeking recovery in their back and core areas. The targeted application of red and near-infrared light helps to stimulate cellular energy, which is crucial for the body's natural healing processes. The ability to relax sore muscles and joints directly addresses common issues like back stiffness and post-workout recovery in the core. Increased blood flow further supports healing by delivering more oxygen and nutrients to the treated areas while helping to remove metabolic waste.

Beyond the core therapeutic benefits, Joovv devices incorporate several user-centric features. The Joovv Solo 3.0 is Bluetooth enabled, allowing for smart control and potentially personalized treatment settings through an app. It also includes protective eyewear, which is essential for safe use, and offers upgradeable kit options to enhance its functionality. The overall user experience is a strong point for Joovv. Alex Fergus, a red light therapy expert, noted that Joovv offers "Great branding, which is reflected in the packaging, app, design of the panel, and much more." He also highlighted that "Using the panel is straightforward and easy and the control panel is very well-engineered." This emphasis on design and ease of use ensures that users can integrate red light therapy seamlessly into their daily routines.

For optimal results, Joovv provides clear treatment guidelines. They recommend standard 10-minute treatments, positioned 16-24 inches from the device. For symptomatic areas like a sore back or tight core, 15-20 minutes may be beneficial. However, Joovv advises against exceeding this, as evidence suggests diminishing returns beyond a certain point—your cells can only absorb so much light at once. Consistency is key to maximizing the benefits, with Joovv recommending once-daily use, or 2-3 times per day for symptomatic areas. The Joovv Solo 3.0 is also HSA/FSA eligible, making it a more accessible health investment for many consumers Joovv Solo 3.0 product page. This eligibility further underscores its recognition as a legitimate health and wellness tool.

In summary, Joovv devices combine powerful red and near-infrared light therapy with innovative features, a premium design, and user-friendly controls. The modularity allows for adaptable setups, and the focus on pain reduction, muscle relaxation, and increased blood flow makes them highly effective for targeting back and core issues. While they may come at a higher price point, the comprehensive benefits and overall user experience are significant advantages.

Frequently Asked Questions

How often should I use a red light therapy belt?

To get the most out of your red light therapy treatments, consistency is key. Joovv recommends once-daily use for their devices, though 2-3 times per day may be beneficial for symptomatic areas like a sore back or tight core. Standard treatment guidelines suggest 10-minute sessions at 16-24 inches from the device, with 15-20 minutes potentially beneficial for symptomatic areas. Beyond this, evidence points to diminishing returns, as cells can only absorb a limited amount of light at once.

Are red light therapy devices HSA/FSA eligible?

Yes, many red light therapy devices, including the Joovv Solo 3.0, are HSA/FSA eligible. This means you can use funds from your Health Savings Account (HSA) or Flexible Spending Account (FSA) to purchase these devices, making them more accessible as a health investment. Mito Red Light also states their devices are HSA/FSA eligible, offering financing options as well.

What is the difference between red light and near-infrared light?

Red light (typically around 660nm wavelength) is absorbed by the skin and superficial tissues, making it beneficial for surface-level concerns like skin health, collagen production, and inflammation. Near-infrared light (typically around 850nm wavelength) penetrates deeper into the body, reaching muscles, joints, and bones. This deeper penetration makes it ideal for muscle recovery, joint pain relief, and stimulating cellular energy in deeper tissues, which is particularly important for back and core therapy. The Joovv Solo 3.0 uses 75 LEDs for 660nm and 75 LEDs for 850nm, while the Infraredi Max 2021 uses 105 LEDs for each wavelength.

How is light therapy power measured?

Light therapy power is primarily measured in two ways: radiant flux (total light output) and irradiance. Radiant flux measures the maximum light-emitting capability of a device, or how it converts electrical power into light energy, with units in milliwatts (mW) or watts (W). Irradiance measures the power output of light over a specific area, typically expressed in milliwatts per square centimeter (mw/cm2). For example, Alex Fergus's test showed the Joovv Solo 3.0 with a peak power output of 74 mw/cm2, and the Infraredi Max at 76.8 mw/cm2.

Can red light therapy help with muscle recovery?

Yes, red and near-infrared light therapy is designed to help with muscle recovery. Joovv devices, for instance, emit light designed to reduce pain, relax muscles and joints, and increase blood circulation. The 850nm near-infrared wavelength, in particular, penetrates deeply to reach muscle tissue, aiding in recovery and performance. Some devices, like the Joovv Solo 3.0, even include a pulsing function of 10hz for the 850nm wavelength, which can be beneficial for recovery and performance.

Sources

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