New Research Reveals Exercising One Arm Has Twice the Benefits

Arm Curl

New research from Edith Cowan University (ECU) has revealed that training one arm can improve strength and decrease muscle loss in the other arm — without even moving it.

The findings could help to address the muscle wastage and loss of strength often experienced in an immobilized arm, such as after injury, by using eccentric exercise on the opposing arm.

In eccentric exercises, the contracting muscle is lengthening, such as when lowering a dumbbell in bicep curls, sitting on a chair slowly or walking downstairs. Previous research has shown these exercises are more effective at growing muscle than concentric exercises, in which muscle are shortening such as when lifting a dumbbell or walking up stairs.

A new way of thinking

ECU’s Professor Ken Nosaka in the School of Medical and Health Sciences was part of the international study and said that the findings challenge conventional rehabilitation methods and could improve outcomes for post-injury and stroke patients.

“I think this could change the way we approach rehabilitation for people who have temporarily lost the use of one arm or one leg,” Professor Nosaka said.

“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.”

The opposite effect

The study involved 30 participants who had one arm immobilized for a minimum of eight hours a day for four weeks. The group was then split into three, with some performing no exercise, some performing a mix of eccentric and concentric exercise and the rest performing eccentric exercise only.

Professor Nosaka said 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.

“Participants who did eccentric exercise had the biggest increase in strength in both arms, so it has a very powerful cross-transfer effect,” he said.

“This group also had just two percent muscle wastage in their immobilized arm, compared with those who did no exercise who had a 28 percent loss of muscle.

“This means that for those people who do no exercise, they have to regain all that muscle and strength again.”

Future of rehab

Professor Nosaka said he plans on expanding the research further into other arm muscles and movements.

“In this study we focused on the elbow flexors as this muscle is often used as a model to examine the effects of immobilization on strength and size, and of course it is an important muscle for arm movement,” he said.

“In the future, we hope to look at how eccentric exercise can help improve motor function, movement, and fine muscle control, which is particularly important for stroke and rehabilitation patients.”

Professor Nosaka also said this type of training is useful for athletes who can begin post-injury recovery sooner.

Reference: “Contralateral Effects of Eccentric Resistance training on Immobilized Arm” by Omar Valdes, Carlos Ramirez, Felipe Perez, Sebastian Garcia‐Vicencio, Kazunori Nosaka and Luis Penailillo, 8 September 2020, Scandinavian Journal of Medicine and Sports Science.
DOI: 10.1111/sms.13821

11 Comments on "New Research Reveals Exercising One Arm Has Twice the Benefits"

  1. How does one perform only eccentric exercises? Is a second person lifting the dumb bell so that the patient only lowers it? How does one only go downstairs? Or only sit down? Rather confusing.

  2. That’s good news for all you Popeye-armed chronic mastorbators out there…

    • Can confirm that this does NOT work. My right bicep is a good 15% bigger for what I can only imagine is this reason.

  3. Just walk and garden, you’ll be fine

  4. And 15 year olds all over the world rejoice.

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    This was known by Arthur Jones and the Nautilus high-intensity training research people 30+ years ago. Nothing new here…

  6. Didn’t Ellington Darden run this experiment in the 80s?

  7. Nothing new here, this has been known for a long time. Studies have shown that limbs in casts atrophy far less if the other arm or leg is worked than those that don’t have the good limb exercised. On top of that, if u do isometric exercises (tension in the muscle without any active movement- no range of motion) on the limb in a cast, u can almost complete avoid atrophy.

  8. Following shingles, I had a lot of nerve damage under my left breast. The pain caused me to place my left forearm, like a shelf, under my left breast to minimize movement. Approx 4 months later, I couldn’t straighten my left arm and reach things on shelves that I could before. I accidentally made my own therapy by brushing my hair with my left hand. The longer my hair grew, the more I could stretch my arm. This was a natural cure for me, and 8 years later, I still have long hair.

  9. What a timely article as I sit waiting to find out if I broke tendons or nerves in my mtb crash. My right arm is boogered beyond belief and I had to wait to get out of the cervical collar to get it looked at. Four months later now. I’m hitting the weights with the good arm till they figure it out.

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  10. It’s all in your mind.

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