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Electrical Muscle Stimulation (EMS) has gained increasing attention in the fitness and health space as a tool for encouraging muscle recovery. EMS works by delivering electrical impulses to the muscles in order to increase blood circulation, reduce muscle soreness, and support post-workout recovery. While research into its effectiveness is ongoing, there is still growing interest in how EMS can be used for recovery.

 

What is an EMS Machine and How Does It Work?

An EMS machine is a compact machine that uses electrical impulses on the applied muscles, which causes them to contract and relax. The user will feel a continuous cycle of their muscles tensing and then easing up. 

EMS units have garnered more popularity in the fitness and health space for their post-work recovery benefits. An EMS machine may assist with recovery by increasing blood circulation through the pumping action of muscle contraction and relaxation. Increased blood circulation around the muscles assists with athletic recovery before the next session.

 While the science behind EMS is continuing to evolve, there is some research that shows positive outcomes for EMS when used after a workout session. A systematic review from Malone et al. [1] highlighted studies that showed that EMS assisted recovery by reducing muscle pain, self-perceived recovery, and blood lactate. Further research is required to determine definitive benefits.



EMS vs. Traditional Recovery Methods

Compared to other traditional recovery methods, EMS is a relatively easy-to-apply treatment. Other recovery methods that may mimic or convey other benefits to EMS include:

  • Massage
  • Cryotherapy
  • Cold water immersion
  • Hydration
  • Supplements and optimal nutrient intake
  • Low-intensity activity, including biking and walking

 

Benefits of EMS for Post-Workout Recovery

While there is no such thing as a ‘magic bullet’ for a complete post-workout recovery, using an EMS can convey many benefits. Strength and conditioning coach Derek Hansen [2] highlights the following benefits of EMS, including:

  • Increasing blood circulation for delivering oxygen and nutrients to surrounding muscles.
  • Enhancing muscle activation in preparation for the following training sessions. 
  • Managing muscle soreness and discomfort.

An EMS unit is the most effectively used in combination with other recovery practices, such as optimal nutrition, training program, physical therapy, cryotherapy, supplementation, hydration and massage. 

 

How to Integrate EMS into Your Recovery Routine

  Best Practices for Using an EMS Unit

There are several considerations when using an EMS unit for post-workout muscle recovery, including your placement of the electrode pads, settings and timing. There is no one-size-fits-all approach for ideal EMS treatment. It may be worthwhile speaking to your physiotherapist or other healthcare practitioner about optimal EMS machine usage for your situation. Written below are some general guidelines.

  • Positioning Electrode Pads for Muscle Recovery

There are several considerations for properly positioning the electrode pads, including how many channels are being used, the relative placement of each electrode, and which area of the body you are focusing on.


The term ‘channels’ refers to a pair of electrode pads that deliver the impulses. Most modern EMS machines have at least 2 channels, meaning that they can target larger and more muscle groups. Using a single channel may be more suitable for smaller areas, such as the forearm and foot. The treatment area is found in the area that lies in between the electrode pair(s).

The electrode pad placement will determine which muscle group(s) are being targeted. Each channel’s electrodes should be placed on either end of the muscle belly [3]. Having two or more channels allows an EMS machine to target larger and multiple muscle groups. When multiple channels are used, they should be placed across each other and not in the diagonal position like during TENS. The graph below highlights the location for EMS pad placement.

 

EMS Machine Pads Placement

 

Positioning pads may require at least some understanding of your body anatomy and the functions of your muscles. To elicit a contraction and relaxation, the pads should be placed around opposite ends of the muscle belly. If you are unsure, speak to a health professional, such as a personal trainer, physiotherapist, or doctor.

  • Setting the EMS Mode for Muscle Recovery

Most of the EMS machines on Caremax also have an in-built TENS machine function. To use either mode, you must select between either EMS or TENS mode. Each device will have a different way of adjusting between these two devices. The TENS mode will not mimic the effects of the EMS mode, so it’s important to select carefully beforehand. 

  • Setting the Pulse Rate (Frequency) for Muscle Recovery

A low-frequency setting between 1-9 Hz to activate motor neurones, which leads to a muscular contraction [4]. By stimulating a muscular contraction, the EMS machine is able to assist with increased blood flow and recovery. This may vary from person to person, and so settings may need to be adjusted on an individual basis.

  • Setting the Pulse Width for Muscle Recovery

Once again, finding the optimal pulse width during EMS treatment may vary between individuals. One study by Martinez-Gomez et al. (2022) [5] showed that a pulse width of 300 μs helped improve recovery in athletes participating in high-intensity functional activity.

  • How Often Should You Use Your EMS Machine for Muscle Recovery?

Currently, there are no universal recommendations about how often the EMS machine should be used for muscle recovery. However, a study by Lee et al. (2023) [6] showed that daily treatment with an EMS machine for 30 minutes helped improve athletic performance and recovery.

 

Using Caremax EMS machine for Post-Workout Recovery


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 Caremax 2.0 Classic TENS machine   Caremax 2.0 Pro TENS Machine

 

 

Contraindications: When Not to Use an EMS Machine

An EMS machine can be a great tool for post-workout recovery, but it’s important to use it safely. Here are some key considerations to keep in mind to avoid any risks.

Avoid using a TENS machine on:

  • Damaged skin—including cuts, wounds, or irritated areas.
  • Numb or desensitised areas—where you might not feel the stimulation properly.
  • Swollen or inflamed areas—to prevent this from getting worse.
  • Near tumours or blood clots
  • Areas treated with radiation—as the skin may be extra sensitive.

Who Should Be Careful?

EMS units aren’t suitable for everyone. You should avoid using one or check with your doctor first if:

  • You have an implanted device like a pacemaker or neurostimulator.
  • You have a cognitive or mental impairment that may make it difficult to use the device properly.
  • You can’t give consent to using the machine.
  • You are pregnant.

When Not to Use a TENS Machine

Stop using the machine and seek advice from a healthcare professional if:

  • You have reduced sensation or numbness in the area.
  • You experience severe tingling, pins and needles, or discomfort.
  • Your symptoms get worse after using it.

If you’re unsure whether an EMS machine is right for you, it’s always best to check with a healthcare professional before using one.

 

Potential Risks and Side Effects of EMS Machine Use

When used correctly, an EMS machine is generally safe. However, it’s important to be aware of possible side effects. Most are mild and can be avoided with proper use, but if you experience any negative symptoms, stop using the device immediately and consult a healthcare professional.. While serious side effects are rare, they should be addressed straight away.

Common Side Effects (which are usually mild and temporary)

  • Skin irritation—redness or mild discomfort where the electrodes are placed.
  • Unusual sensations—such as tingling or muscle twitching in the treated area.
  • Pain that mimics or worsens nerve-related discomfort—like burning or sharp pain.

If you experience any of these, stop using the EMS machine and speak to a healthcare professional, such as a physiotherapist.

Severe Side Effects (Rare, but Serious)

These are uncommon but can happen, especially if the device is used incorrectly or if you have underlying health conditions:

  • Rashes or allergic reactions, more commonly due to the electrode pads
  • Increased pain instead of relief
  • Seizures (in people prone to them)
  • Interference with implanted medical devices (like pacemakers)
  • Stroke or blood clots (in high-risk individuals)
  • Skin damage or burns (from incorrect electrode placement or prolonged use)

If you notice any of these severe reactions, stop using the EMS machine immediately and seek medical advice.As with any device, it’s always best to check with a healthcare professional if you’re unsure whether an EMS machine is right for you.




References



  1. Malone, J. K., Blake, C., & Caulfield, B. M. (2014). Neuromuscular electrical stimulation during recovery from exercise: a systematic review. The Journal of Strength & Conditioning Research, 28(9), 2478-2506.
  2. Hansen, D. M. (2015). Electrical Muscle Stimulation as an Effective Recovery Modality. President’s Message-New Studies in Athletics, 37.
  3. Yoo, H. J., Park, S., Oh, S., Kang, M., Seo, Y., Kim, B. G., & Lee, S. H. (2023). Effects of electrical muscle stimulation on core muscle activation and physical performance in non-athletic adults: A randomized controlled trial. Medicine, 102(4), e32765.
  4. Pinar, S., Kaya, F., Bicer, B., Erzeybek, M. S., & Cotuk, H. B. (2012). Different recovery methods and muscle performance after exhausting exercise: comparison of the effects of electrical muscle stimulation and massage. Biology of sport, 29(4), 269-275.
  5. Martínez-Gómez, R., Valenzuela, P. L., Lucia, A., & Barranco-Gil, D. (2022). Comparison of different recovery strategies after high-intensity functional training: a crossover randomized controlled trial. Frontiers in Physiology, 13, 819588.
  6. Lee, M. C., Ho, C. S., Hsu, Y. J., Wu, M. F., & Huang, C. C. (2023). Effect of 8-week frequency-specific electrical muscle stimulation combined with resistance exercise training on muscle mass, strength, and body composition in men and women: A feasibility and safety study. PeerJ, 11, e16303.
  7. University of Iowa Health Care. (2018). Pain medicine: Contraindications and precautions. Retrieved from https://www.healthcare.uiowa.edu/marcom/uihc/pain_medicine/contraindication_precautions_best062018.pdf