Gadgets acting on human muscles with the help of electricity have existed on the market for dozens of years. Their reputation has undergone changes during this period. First portable muscle stimulators were insanely famous an immediately became TV shop hits as ads promised quick muscle growth without much effort. Disappointment in EMS followed soon enough once people realized that it’s impossible to become a jock without training and dieting. However, EMS gadgets did not disappear over time as the consumers still managed to find use in them. Obviously, they won’t turn a skinny geek into Conan the Barbarian, but they will help during recovery or as a pain killer. Pro athletes use them during complicated training sessions or when rehabilitating after injuries.

We have aggregated all important information about EMS and TENS gadgets. You will find a review of 5 muscle stimulators and will be able to choose the best stimulator among cheap and helpful ones.

Table of Contents:

What is EMS? EMS Technology History and How USSR Wanted to Increase the Strength of Weightlifters By 40%

Electrical Muscle Stimulation has long been known to humanity. Scientists discovered electricity’s ability to cause motion in human muscles back in the 18th century. However, no useful application to the invention was found for the first century and a half. No scientist went further than weird experiments (oh look, a dead squirrel’s paw is jerking!) and fantasies about Frankenstein.

Soviet scientists realized that electrical muscle stimulation hides a load of potential in the 1970s. They began to study the possibilities of using electricity for rehabilitation of paralyzed patients and for increasing athletes’ muscles.

NCBI has published an interesting article devoted to those experiments. Soviet researchers set amazing goals as they aimed to improve weightlifters’ strength by 40% with EMS. They believed that combining muscular stimulation with conventional training will lead to great achievements. It is at that time that USSR became the world leader in all weightlifting sports. This could indirectly confirm the effectiveness of this new technology, but the results of the experiments were quite contradictory. Finally, Soviet science concentrated on the medical application of EMS, and the abandoned Soviet idea was revitalized in the USA where clever businessmen decided to make money on people’s desire to have a perfect body with minimum effort.

First, portable muscle stimulators and wonder-belts promising to develop abs and pumped biceps with zero stress appeared in the 80s. Allegedly, you could watch TV and grow muscles. Soon, the authorities intervened in the market of EMS gadgets. None of them received a certificate of a weight-loss device. Ads promoting non-existing properties of these devices were also banned. According to the FDA, EMS was certified as a means of treating muscular atrophy and spasms but not as a muscle growth stimulator.

Nowadays, EMSs are sold both for medical and athletic purposes. They are recommended for recovering and strengthening muscular tissue, for support during complex training, for improving blood flow, as well as for treatment of some musculoskeletal diseases. Some experts keep insisting that combining training with EMS results in synergic muscular growth. This hypothesis has neither been 100% proved nor refuted.

EMS and TENS Action

Our body is designed so that electricity contracts muscular fibers. EMS imitates our central nervous system, so that the correct setting of the electric signal can help you bring such contractions closer to a healthy training. Muscular movement guarantees to accelerate blood flow in the veins, can have an impact on the production of lactic acid and improve muscular elasticity.

It’s important to distinguish EMS and TENS (transcutaneous electrical nerve stimulation). EMS-marked gadgets act on muscles directly while the impulse of TENS devices is set to affect the nerves. EMS causes relaxation, blood flow recovery and creates conditions for muscle growth, while TENS helps eliminate pain, arthritis, sciatica and other neuritis.
EMS and TENS Action: photo

By the way, TENS is an ancient technology. Ancient Romans made people with leg ache stand on electric fish, as historical sources testify. In the 19th century, doctors officially confirmed the effectiveness of electrical treatment.

The bottom line is, make sure you can tell EMS and TENS apart, even though certain gadgets combine these technologies with various levels of success.

Can EMS Gadgets Help Grow Muscles?

Let us dot these i’s. Expensive and powerful medical equipment is capable of maintaining the muscles of paralyzed patients. Ultra-expensive sport EMS gadgets are used to train top athletes of the world. Perhaps these gadgets even tone their muscles. However, no mass-market product has yet proven its ability to really grow the buyers’ biceps and triceps.

Jerry Brainum, nutritionist, draws our attention to one important detail: during regular exercise our body first activates small and weak muscular fibers followed by larger ones, while EMS first involves the latter fibers (larger ones followed by weak ones). It seems that under such circumstances, the muscles are bound to grow, but the expert refers to scientific research and disappoints us by saying that this works in theory only. Effective muscle growth is possible only if gadgets 60 times as powerful as the ones existing today are used (the impulses, though, will no longer be safe for human health).

Brainum also refers to an experiment involving students. One group trained in the gym for 45 days, while the other group worked with EMS gadgets for the same period. Unfortunately, the second team was far behind in all metrics. Moreover, all of the test subjects were bored during the electric workout and craved to go to the gym. C’est la vie!

What about weight loss. The amount of calories burned during electric workouts is considered marginally low by Nicola A. Maffiuletti in his publication devoted to electric stimulation. Other scientists confirm this and emphasize the fact that only physical exercise involving various muscle groups simultaneously leads to weight loss.

Of course, EMS is not surrounded by negative feedback only. The latest research proves the positive effect of electricity on the adaptation and learning of muscular fibers, improving their stamina and stress-resistance, which is crucial to systemic training approach.

Types of EMS Gadgets

Gadgets not only vary by the type of technology used (EMS or TENS). Other differences exist, such as in devices’ modes, in the power of the electric impulse, mobility or dimensions of a gadget.

EMS abs belts are most popular. Certain sensors are designed to train legs and arms. However, nowadays the market is flooded with universal devices connecting various sensors to the control section. They are convenient as they can be attached to various body parts to activate different muscle groups simultaneously.

An FDA certificate is crucial for products distributed in the USA. It is only legal to sell certified devices; the consumers will bear all the risks at their own expense if they buy uncertified units. We recommend that you check the FDA database before buying a certain device, especially since the black list is constantly updated.


First of all, EMS trainers have a large list of contraindications. Using these devices is contraindicated to pregnant women, heart disease patients, those who have cardio stimulators, patients with renal insufficiency or chronic diseases of the digestive tract. Oncology or blood flow problems are also a reason for an EMS or TENS ban.

Experts recommend consulting a physician before using any gadget, especially if you have recently been ill with flu, cold, broke a bone, ruptured a ligament or damaged a muscle. Be careful with electricity!

As for increasing the effectiveness of EMS, most manufacturers give the following recommendations. Instead of training your back, abs and ankles simultaneously, focus on each area in turn. Even wiring both limbs disperses the current.

Start the gadget when the muscles are relaxed, do not stimulate flexors and extensors at the same time. Be careful about fixing the sensor on a muscle as improper fixation can give zero results.

5 Best TENS and EMS Muscle Stimulators

Tens Unit Ohuhu Rechargeable 16 Modes and 12 Pads Electric Muscle Stimulator EMS Machine

This ~$30 gadget has 16 modes and 12 electric sensors (six of them can be attached simultaneously) to be fixed on the muscles. Ohuhu’s advantage is definitely its large informative display.

Everyone has faced a situation when a gadget claims to have plenty of possibilities and modes that are very difficult to handle as a small screen and unknown icons confuse you. Here, the screen is divided into sectors providing information about performance (from head massage to acupuncture). Moreover, time, intensity and power of the session as well as the battery charge data are output on the screen.
Rechargeable Electric Muscle Stimulator Machine: photo

The manufacturers recommend buying this gadget to relieve muscular pain, normalize blood flow, sleep and even stomach processes. They honestly warn that Ohuhu won’t inflate your muscles and will only relieve pain. A session can be set to last from 10 to 60 minutes with 20 stages of massage intensity.

What are other advantages of this device? Suckers do not require any gel as they are sticky (up to 6 large and 6 small two-foot wired sensors can be connected). The battery lives for up to 10 hours and is charged via USB. The device itself is rather small: its dimensions are 8.7x6.5x2.3 inches. Twelve suckers, a manual, a body atlas, a USB cable and a charger are supplied. The quality of translation of the manual from Chinese to English leaves much to be desired, though. Read over 400 customer reviews on to know more.

Price: ~$30 Check the current price

FDA cleared HealthmateForever YK15AB TENS unit Electronic Pulse Massager

Judging by the amount of positive feedback, this must be the most popular product of this category. 85% of nearly 7000 customer reviews on are positive, which is a record.

The gadget uses 8 suckers and has 15 modes. Its design resembles a TV or an AC remote control. It has a small screen but also a bunch of backlit buttons. Each button is labeled and turns on a particular mode, e.g. “Shoulder”, “Back”, “Elbow” or “Ankle”. Such control is more user-friendly for many customers than having a single button for everything. A rear strap allows attaching the gadget to jeans or a shirt pocket. Many competitors haven’t implemented this convenient option in their devices.
HealthmateForever Electronic Pulse Massager: photo

A control, four sets of wires (with a sensor at each end), eight sucker sensors, a holder and 3 AAA batteries are supplied. A manual and a body atlas are also available, and the whole pack costs only ~$25.79.

The manufacturer deserves extra credit for consumer responsibility as the contraindications (which are often not even mentioned by competitors) are listed on Familiarize yourself with the list before you buy this product!

Price: ~$25.79 Check the current price

United Surgical Tens 7000 Tens Unit - Tens Machine for Pain Management, Back Pain and Rehabilitation

This is also a very popular product with nearly 5000 customer reviews on This gadget looks more respectable as it resembles pro medical equipment. A large screen is replaced with a small technical one with two sections, and the streamlined plastic case is replaced with rubber and metal elements. All four control buttons are covered by the protective lid on the rear side. The wires connecting the sensors are more solid and thick than those of the competitors (they are made of lead). However, it has the least amount of sensors in our review: only four. A firm case can be used to transport the gadget. The exterior of the Tens 7000 is a mix of a defibrillator from Scrubs and an electronic pressure meter.
Edition Digital TENS Unit with accessories: photo

We didn’t joke when we mentioned a defibrillator. According to the comments, this is the most powerful and affordable (it costs only ~$23.53) stimulator reviewed. Users warn that incorrect settings can turn it into an electric shocker, so a first try of Tens 7000 can be painful if you ignore the manual and don’t adjust the settings.

There are five consumer modes available, which is less than in other products. However, each mode combines a predefined set of speed, intensity and power, so you don’t have to adjust them manually. The powerful 9A battery is supposed to provide 48 hours of continuous performance.

Price: ~$23.53 Check the current price

Compex Edge Muscle Stimulator Kit

This is the most expensive gadget of our review; its price is 6-7 times higher than that of the main competitors. Is it worth its price tag of ~$222?

First, we finally deal with a large brand established in the USA back in 1987. Compex is a manufacturer of medical and sport electronics, and many of its products are respected both by mass audience and pro athletes. By no means is Compex a no-name brand, so your claims will surely be handled, should any arise.
Compex Edge Muscle Stimulator Kit: photo

This is the only device in this rating that promises to grow muscles without stressing heart and lungs (however, there is no proof of any effect). The gadget’s main aim is still pain relief and improvement of blood circulation. The manufacturers promise to strengthen capillaries and improve muscle flexibility. Compex can allegedly increase blood flow up to 600 percent faster and reduce lactic acid production in 4-6 minutes.

The product description contains an important disclaimer: Compex Edge is recommended for professional use so that athletes stay in shape. The brand is known to collaborate with pro athletes, so it can be trusted. The stimulator has four wires with two sensors each. Electrode sensors are made with the brand’s own technology, and two sucker sizes are available. In the comments, the customers praise the gadget’s durability and long autonomous performance. Read all customer reviews on

There are only three modes instead of dozens: muscle recovery, training and intensive training. Each mode has been designed using medical expertise, and you can read all the details regarding lactic acid distillation and various muscle fiber exercises.
Compex Wireless & Sport Stimulator: photo

By the way, this is not a single product; there is a whole range of Compex stimulators. For instance, you can find a wireless stimulator for ~$535 and Sport Elite stimulator for ~$249.

Price: ~$222 Check the current price

iReliev TENS + EMS Combination Unit Muscle Stimulator for Pain Relief & Arthritis & Muscle Strength

This gadget is also premium-priced as it costs ~$79.95. Unlike Compex, we don’t see this brand’s own style, only imitating famous competitors. iReliev obviously copies the design of early iPods and even Apple products’ naming style. The white streamlined case looks neither expensive nor durable.
iReliev Combination Unit Muscle Stimulator: photo

But we don’t judge a book by its cover, do we? Let’s check out both the advantages and the disadvantages of iReliev TENS+EMS. This small device is the size of a credit card, and as few as four electrode sensors can be attached to it. To be fair, there are rather three sensors than four as one of them is simply split to be fixed on two muscles at once.

The interface, buttons and screen are intuitive and straightforward, thanks to the copied iPod design. There is a 5-60 minutes timer. Out of fourteen available modes, seven aim at pain relief; one eliminates arthritis and six modes train and recover muscles. In general, all these options except arthritis treatment are offered by competitors.

As for the advantages, we’ll note that this is the only manufacturer to cite a medical review. The expert comments: “I, Joe Noel, PT, licensed Physical Therapist in the State of Florida and having practiced as a PT for the last 24 years, do hereby recommend the iReliev TENS + EMS unit for treating pain & increasing muscle strength. I have used TENS & EMS in my clinical practice & recommend for home use. I believe iReliev is uniquely designed to offer RX strength pain relief & muscle conditioning,”

They also promise a refund within fourteen days, if you are not satisfied with iReliev TENS+EMS.

Finally, let us say a few words about the pack: the gadget is supplied with four double and eight single sensors, three AAA batteries, a case, a set of wires, and a strap for attaching it to clothes. This is a standard pack, and this high price truly makes this stimulator an outsider of our rating.

Price: ~$79.95 Check the current price

EMS & TENS Muscle Stimulators Comparative Chart

Product Type Modes/Programs Price
Tens Unit Ohuhu EMS Machine
Rechargeable Electric Muscle Stimulator Machine min: photo
TENS & EMS 16 ~$30

HealthmateForever YK15AB
HealthmateForever Electronic Pulse Massager min: photo
TENS & EMS 15 ~$25.79

United Surgical Tens 7000
Edition Digital TENS Unit with accessories min: photo
TENS 5 ~$23.53

Compex Edge Silver
Compex Edge Muscle Stimulator Kit min: photo
EMS 3 ~$222

Compex Wireless EMS
Compex Wireless EMS min: photo
EMS 9 ~$535

Compex Sport Elite
Compex Sport Elite min: photo
EMS 9 ~$249

iReliev TENS + EMS
iReliev Combination Unit Muscle Stimulator min: photo
TENS & EMS 14 ~$79.95