Weight training of one arm benefits both arms

"This group of people lost only 2% of their muscle mass on the arm, while the group who did not exercise lost up 28%. This means that the group who have not exercised must regain those muscles and strength. " But it is still not entirely clear how these exercises help static limbs avoid muscle atrophy. One possibility is through complex muscle contractions in one arm, the brain also sends signals to the other arm to keep muscles vigorous.

It is also possible that the entire support network for muscle contraction is spread throughout the body, and it is unnoticeable but it does have influence on the inactive biceps of the other arm.

Another question is whether the same effect will also appear on other symmetrical parts of the body, such as two legs.

For those who are recovering from injuries or suffered from a stroke before, it can be a good start for recovery exercise, as long as the risk and benefit of specific training at any time can be balanced up.

Nosaka said: “By starting rehabilitation and training on the uninjured limb, we can prevent the muscle damage caused by the training of the injured limb, at the same time we can also strengthen the strength of this limb. "