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Is electrical muscle stimulation really a short-cut to getting buff?

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Is electrical muscle stimulation really a short-cut to getting buff?

In a 1993 film Dragon: The Bruce Lee Story there’s a scene where the main character sits at a typewriter wearing electrodes strapped across his chest and biceps.

The martial arts superstar is zapping his muscles so he bulks up without doing any exercise.

“Three minutes is like doing 200 push-ups,” he claims.

This technology, called electrical muscle stimulation or EMS, was explored by the Russians back in the 1960s to help athletes train, and it’s since been embraced by the likes of soccer star Cristiano Ronaldo and Olympic gold medallist Usain Bolt.

These days, EMS is promoted to people who want to get buff. You can even wear a whole-body EMS suit at the gym.

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EMS proponents say that the technology, which sends electric impulses through skin and into muscle below to make them contract, “bypasses” the brain, triggering muscles to work and grow in a “smarter and more efficient way”.

Some ads say you can get your weekly whole-body workout in just 20 minutes — without lifting a single weight.

It sounds too good to be true, so what is the scientific evidence for these claims?

What’s the theory behind EMS?

Our muscles are made up of different “motor units”, each consisting of a nerve and the muscle fibres it activates.

One type of motor unit is smaller, contracts slowly and takes a while to get tired, while the other is larger, contracts rapidly and fatigues quickly.

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The larger units use more energy but can generate more force. These are the ones that we use to build strength over time. 

EMS is often used as a supplement to training. (Getty Images: Milan Markovic )

When we voluntarily activate our muscles — by lifting weights, for example — our brain activates the smaller slower motor units first before activating the larger faster ones, says Swarup Mukherjee, a sports and exercise physiologist at Nanyang Technological University of Singapore.

“What EMS does is it reverses this natural recruitment order.”

And it is thought that by stimulating the larger motor units first, EMS can speed up the process of building muscle mass — and strength.

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From medicine to elite sport

Manufacturers of some EMS gadgets have landed in trouble for overstating their claims on late night infomercials.

While some gadget claims might not stack up, there is a scientific basis for using electricity to stimulate muscles. In fact, the idea has been around for centuries, and has developed into an important way to exercise muscles when someone has an illness or injury.

“For patients that are unable to physically exercise for whatever reason, electrical stimulation can replace exercise,” says Gordon Lynch, who studies the use of EMS with the Centre for Muscle Research at the University of Melbourne.

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“The evidence is really strong that we can get adaptations in muscle and recruit muscles in a way that that can be beneficial.”

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But, Professor Lynch says, it is less clear whether EMS works as a general fitness tool.

“There’s no real consensus about how to optimise this form of training for otherwise healthy people.”

Still, there are no shortage of online testimonials from people who swear EMS workouts are the way to go.

But what does the evidence say?

Some research, such as this small 2016 randomised controlled trial of middle-aged men, supports using EMS to build strength and lose fat.

And the technology’s “time-efficiency” and “joint-friendliness”  is seen by some researchers as attractive to those “unable or unmotivated” to do intense exercise.

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A 2023 review by Dr Mukherjee of 10 other studies also found EMS increased the size of the muscles they stimulated in healthy adults.

And since muscle is one of the most energy-hungry tissues in the body, building them should also help burn fat, Dr Mukherjee says.

Olympic medal winning Usain Bolt running fast.

Retired sprinter Usain Bolt is among the high-profile athletes who have used EMS. (Getty Images: Ashley Feder/Stringer)

But, he cautions, building bigger muscles does not necessarily translate to the sort of strength that will make gym exercises or everyday activities easier.

In fact, none of the studies in his review found EMS improved such “functional” strength.

“There isn’t enough body of data to convince us that it is an equivalent of voluntary resistance training,” Dr Mukherjee says.

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Other researchers who reviewed the evidence on whole-body EMS  concluded active people won’t get any advantage from the technology, although older sedentary populations may benefit.

One limitation of EMS is that it contracts static muscles, but to do specific activities our brain orchestrates a combination of muscles in a special way, Dr Mukherjee explains.

During bicep curls, for example, our biceps contract, while our triceps must lengthen and relax.

This is why there is a preference among proponents to combine EMS with traditional muscle exercises, Dr Mukherjee says.

Getting the right ‘dose’

Everyone’s muscles respond differently to EMS, Professor Lynch says, adding that this makes giving the right dose of stimulation a challenge.

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“If it’s not enough, then you’re not going to get any benefit at all. And if you over stimulate, then you can cause muscle damage.”

Sport scientist Nicola Maffiuletti of the Schulthess Clinic, an orthopaedic hospital in Switzerland, agrees.

Traditional muscle building involves progressively — and carefully — adding heavier weights to a training regimen over time as your muscles adapt and get stronger.

But Dr Maffiuletti says it’s harder to know how much current to use to get the right stimulation with EMS.

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“When you inject current you don’t know how to properly dose on an individual basis.”

Possible risks of EMS

Dr Maffiuletti is particularly concerned about the dose of current delivered by whole-body EMS suits.

These are a wetsuit-type outfit with electrodes that stimulate a number of muscles across the body at the same time.

He says it’s like “giving a pill” when we don’t know how much drug the pill contains, or what it’ll do to the person taking it.

“It’s not a cautious way to exercise.”

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While painful muscles are to be expected after a muscle workout of any kind, Dr Mukherjee warns people should not experience pain at the time of receiving EMS — discomfort yes, but not pain.

In 2016 Dr Maffiuletti co-authored a piece in the British Medical Journal calling for better regulation of whole-body EMS suits after seeing people’s muscles break down in a condition called rhabdomyolysis, which can lead to kidney damage.

While there are fewer reports of rhabdomyolysis from EMS these days, he remains concerned about how well people are screened before using whole-body suits at the gym.

Woman wearing gym gear and an electrical muscle stimulation suit doing a sitting exercise with round weight.

Experts advise caution when using EMS. (Getty Images: Nevena1987 )

Even experts who support the use of whole-body EMS in general fitness warn of potential harms and the need for better oversight.

The US Food and Drug Administration has warned some consumer products have reportedly shocked, burned, bruised and irritated the skin of users, and interfered with critically important medical devices such as pacemakers.

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If you are planning to fork out for EMS at the gym, Professor Lynch advises looking for a personalised approach with supervision by a professional like a physiotherapist who is trained in using the technology.

But he recommends making the most of more traditional forms of exercise and strength training first.

Finally, he adds, if weight loss is the goal you also really need to watch what you put in your mouth.

Delve into claims surrounding EMS in more detail on What’s that Rash? and subscribe to the podcast for more answers to more health questions.

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Fitness

Prepare for Ski Season With These Workouts

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Prepare for Ski Season With These Workouts

Skiing can be a whole lot of fun when the snow starts flying. But your body can take a beating on the slopes if it’s not properly prepared.

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Sports medicine specialist Molly McDermott, DO, shares how to get ready for ski season with some workouts and strategies.

Ski training routine

Some elite skiers start training at the tail end of spring — about six months before they ever hit the slopes. Others may need less time. In general, Dr. McDermott recommends training at least six to eight weeks before your first outdoor adventure.

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As part of your routine, you’ll want to focus on ski workouts that build:

  • Strength
  • Endurance
  • Flexibility
  • Neuromuscular control (also known as muscular coordination)

Trying to jump into a sport when you haven’t intentionally trained is difficult and challenging, says Dr. McDermott. That’s especially true given the physical demands that come with skiing.

“You want to train your brain, nerves and muscles to really build stability and balance so you can have more control over how you jump and land,” she notes.

Ski exercises

Ski-focused training puts a strong emphasis on lower-body exercises, targeting everything from your glutes to your ankles. But you’ll want to take a full-body approach to ski exercises, which means working on your core and upper body as well.

“You’re going to have to make real-time decisions when you’re out on the slopes,” stresses Dr. McDermott. “You’ll need to strengthen your whole body to be able to do things like pivot or change direction, keep your balance, propel yourself forward and withstand the impact of skiing.”

Dr. McDermott recommends starting with just bodyweight exercises if this is your first go at it. More experienced athletes can focus on higher weights or machines. In general, she recommends doing three sets of 10 to 15 reps each. Then, as you work through your training, you can progressively load your weight, sets, reps or how long you exercise to continue building strength and endurance.

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Here are some workouts that lend themselves to skiing.

Dynamic warm-up

Warming up before any workout is key, especially right before you hit the slopes. The International Ski and Snowboard Federation agrees. Dynamic warm-ups and cool-downs are highly effective for preventing injury and improving performance.

Consider starting and ending your ski workout with five to 10 minutes of:

  • Jogging
  • Using an elliptical
  • Walking on a treadmill

“You’re warming up your muscles and then stretching them, as opposed to static, cold stretching,” explains Dr. McDermott.

Squats

“Squat maneuvers help make sure you have the coordination of your nerves and your muscles working together so your muscles are strong and keep your body aligned — in particular, keeping your knees from turning in,” says Dr. McDermott. “As squats become easier, you can progress to squat jumps.”

  1. Stand with your feet shoulder-width apart with your toes pointed slightly outward.
  2. Hinge at your hips, bend your knees and slowly lower your body (as if sinking into a chair).
  3. Lower until your thighs are parallel to the ground, keeping your knees in line with your toes and your weight on your heels.
  4. Hold the position for three to five seconds.
  5. Shoot up quickly to your starting position by pushing through your heels.
  6. Repeat this process for 10 to 15 reps.

Side-lying hip abductors

Hip abductor exercises help with skiing because they focus on balance, control and building strength in your hips, glutes and thighs.

  1. Lie down on your side with your legs extended straight. Your right leg should be on top of the other and you should rest your head on your left arm.
  2. Keeping your hips steady, lift your right leg so your knees are no longer touching. You should feel a stretch in your upper thigh and hip.
  3. Slowly lower your right leg.
  4. Repeat for 10 to 15 reps, then switch sides and continue.

Calf raises

Calf raises help improve ankle mobility and calf strength — all needed for those quick turns while skiing.

  1. Stand with your feet hip-width apart, with your arms hanging at your sides.
  2. Slowly lift the back of your heels until you’re standing on the balls of your feet.
  3. Hold this position for one to two seconds before lowering back down.
  4. Repeat for 10 to 15 reps.

Skater hops

“Skater hops are single-leg hops from side-to-side,” describes Dr. McDermott. “These are really going to help you in certain ski maneuvers.”

  1. Stand with your feet hip-width apart and your hips and knees bent at a 45-degree angle.
  2. Push off the floor with your left leg so that you jump to the side, landing on your right leg.
  3. Keep your knees bent and your left leg crossed behind your right (as if you’re skating).
  4. Then, jump back to the opposite side, crossing your right leg behind your left.
  5. Repeat this process in quick succession for 10 to 15 reps, jumping as fast and far as you’re able.
  6. To maintain momentum, it helps to swing your left arm forward as you’re pushing off with your left leg and vice versa.

Shoulder shrugs

“Shoulder shrugs are a good ski exercise because they help build the upper trapezius muscles that connect with your neck,” says Dr. McDermott. “They really work on your posture.”

  1. Start by standing tall, feet hip-width apart.
  2. While looking straight ahead, lift both of your shoulders and slowly roll them backward in a circle for 10 seconds.
  3. Repeat the process by circling your shoulders in the opposite direction for 10 seconds.

Chin tucks

Chin tucks involve a gentle range of motion to improve posture and strengthen neck muscles.

  1. While sitting or standing in a relaxed position, look straight ahead and lightly touch the bottom of your chin with your index finger.
  2. Gently pull your head and neck back so your chin moves away from your finger.
  3. Hold this tucked-chin position for up to 10 seconds before slowly extending your head and neck forward to the starting chin position.
  4. Repeat this process for 10 to 15 reps.

Push-ups

“Push-ups are good for strengthening your shoulders, chest and core, which helps with balance and stability when you’re skiing,” says Dr. McDermott.

  1. Kneel on all fours with your palms flat on the floor in front of you and your fingers facing forward. Hands should be shoulder-width apart and directly below your shoulders.
  2. Lift your knees off the floor and straighten your legs.
  3. Bend your elbows and tuck them to your sides as you slowly lower your chest and chin to the floor.
  4. Push through your palms until your arms are fully extended. Don’t let your hips or back dip to the ground — your head, spine and butt should all be aligned.
  5. Repeat this process for 10 to 15 reps.

Planks

This exercise targets your wrists, forearms, core and upper body — all areas that promote stability and strength while skiing.

  1. Get into a push-up position, with your legs extended and your elbows directly beneath your shoulders.
  2. Hold this upright push-up position for 10 to 15 seconds, with your abs engaged and butt and back aligned.
  3. For a modified challenge, you can lower your knees to the floor while holding this position.
  4. For a deeper stretch, you can rock your hips back and forth, or lower down to your elbows for a low plank.

Bridges

Bridges help strengthen your glutes, which help guide and direct your skis.

  1. Lie on your back with your knees bent, feet on the floor and arms at your sides.
  2. Squeezing your butt and abdominal muscles, push through your heels to slowly lift your hips toward the ceiling.
  3. Keep your back straight and your arms pressed into the floor at your sides.
  4. Hold this position for a few seconds, before slowly lowering your hips to the floor.
  5. Repeat this process for 10 to 15 reps.

Oblique twists

Also known as a Russian twist, this exercise focuses on your abdominal muscles and core strength. It helps with skiing because it supports your ability to rotate, turn and move quickly.

  1. Sit on the floor with your knees bent and your feet flat.
  2. Lean back at a 45-degree angle and squeeze your abdominal muscles.
  3. Extend your arms out straight in front of you and clasp your hands together.
  4. Engage your core as you twist slowly to the right as far as you feel comfortable, moving your arms in the direction you’re turning.
  5. Return back to center, pause and then twist to the left side.
  6. Repeat this process for 10 to 15 reps.

Cardio exercises

Skiers can also benefit from cardio exercises that get their blood flowing and build aerobic endurance, like:

  • Cycling
  • Running
  • Swimming
  • Rowing

“Build cardiovascular and low-impact activities into your training routine to help improve your performance and increase your endurance,” advises Dr. McDermott. “Some days you can break it up into sets or you can do 30 minutes straight.”

A note before hitting the slopes

A big part of ski training is getting your body acclimated to cold-weather exercises. For athletes who live in areas where winter runs strong, it helps to train early and get that outdoor exposure as temperatures begin to drop during the fall.

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Others who live in warmer climates might benefit from taking cold showers, ice baths or lowering indoor temperatures weeks before heading out on a ski trip.

Once ski season begins, make sure you warm up before heading outdoors, stay hydrated and keep moving to keep your body warm.

“When you’re skiing, a lot of unexpected things happen,” cautions Dr. McDermott. “The weather changes and things happen really fast. So, you want to be physically and mentally prepared before you hit the slopes, making sure you’ve got the right equipment, the right clothing and you’re prepared in case of injury.”

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Forget the gym — you just need 20 minutes and 2 dumbbells to strengthen your whole body with this workout

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Forget the gym — you just need 20 minutes and 2 dumbbells to strengthen your whole body with this workout

One of the harder parts of committing to a training routine is knowing where to start, and that’s true of those who have never trained regularly before as well as more experienced people coming back after a break.

This 20-minute workout from fitness trainer Lindsey Bomgren, founder of Nourish Move Love on YouTube, is perfect for easing your way into a training routine, especially if you’re coming back from a break because of illness or any other reason.

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Ditch sit-ups and crunches — this 5-move standing abs workout will help you build a stronger and more sculpted core

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Ditch sit-ups and crunches — this 5-move standing abs workout will help you build a stronger and more sculpted core

The beauty of a standing abs workout is that you do not need a mat, much space, or to get down on the ground for any of the exercises. That makes it easy to fit into a busy day, whether you are working out at home, short on space, or prefer to stay off the floor altogether.

None of that means it is easier or delivers fewer results. Pilates instructor and Balance Body Educator Portia Page built this five-move, all-standing core workout to show that you can still challenge your abs effectively without a mat or traditional floor exercises.

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