Flex Your Way to Stronger Muscles with This Surprising Workout Hack

I vividly remember the day I got the cast taken off my arm. I had slipped going down our front porch in the rain, and after six weeks in that itchy, plaster monstrosity, I couldn’t wait for the nurse to cut it off so that I could actually scratch the skin that had driven me crazy.

What I didn’t realize was that I was in for a big surprise.

Like so many others who have lived with an immobilized limb for weeks on end, the first glimpse of my arm — wasted and so much smaller than the other side — was a shocker.

Yet in hindsight, I realized that there really wasn’t anything else I could have expected.

After all, my doctor had told me to rest, use the arm as little as possible and let the bone heal. It’s all they knew to do — until now.

Decrease muscle loss and strength without even moving the limb

That’s because brand-new research from Edith Cowan University has revealed a surprising answer to the muscle wastage people experience when mobilized following a surgery, living in a cast for weeks on end or even following a stroke…

Exercising the other side!

The study involved 30 participants who had one arm immobilized for at least eight hours a day for four weeks. The group was then split into three:

  1. No exercise
  2. Exercising the opposite arm using a mix of eccentric and concentric exercise and the rest
  3. Exercising the opposite arm using eccentric exercise only

And guess what…

The group who used a heavy dumbbell to perform only eccentric exercise on their active arm showed an increase in strength and a decrease in muscle atrophy, or wastage, in their immobilized arm — the arm that did not work at all!

In fact, according to researchers, people who used eccentric exercise alone had the biggest strength increase on both sides, demonstrating an extremely powerful cross-transfer effect of exercise.

On the other hand, people who did no exercise lost a whopping 28 percent of their arm muscle — muscle they would have to work hard to regain.

Eccentric versus concentric

So if eccentric exercises are so powerful that they can even build muscle on the opposite side of your body, what exactly are they?

Put simply, in eccentric exercises, your contracting muscle is lengthening.

This happens when you’re:

  • Lowering a dumbbell during bicep curls
  • Slowly lowering yourself down to sit on a chair
  • Or walking downstairs

They’re the opposite of concentric exercise where the muscle you’re working is shortening, like when you lift (rather than lower) that dumbbell or walk upstairs.

Other examples of eccentric exercises include the lowering phase of:

  • Squats
  • Lunges
  • Rows
  • Shoulder presses

And with such amazing results from the study, the researchers believe these exercises could be the future of rehabilitation following injury or stroke.

They say that “By starting rehab and exercise in the uninjured limb right away, we can prevent muscle damage induced by exercise in the other limb and also build strength without moving it at all.”

But don’t wait for an accident to happen (knock on wood that it doesn’t!). There are some practical ways to put this discovery to use…

  • If you have painful arthritis in one shoulder but not the other, use your good arm to do overhead presses or arm curls with a hand weight.
  • Is one knee “out of order” but the other just fine? Do lunges using the good knee.
  • Even if you have less grip strength or an injury that makes one hand less able to hold a hand weight, exercise with the stronger hand.

According to these findings, both sides of your body should benefit.

But if you want to give your muscle recovery an extra edge, supplement with the powerful antioxidant resveratrol. A study from researchers at Harvard found that the antioxidant resveratrol could help astronauts keep their muscles strong on long missions.

And if it’s painful arthritis that’s limiting your movement, resveratrol can help there too. A research review from Central South University in China found that resveratrol can switch on a gene that may stop the progression of osteoarthritis.


Exercising one arm has twice the benefits — EurekAlert!