Weight training of one arm benefits both arms

Conversely, stretching the arm is through eccentric contraction. The biceps will still exert force, but the whole muscle will become longer.

Both training methods can improve muscle strength and physical fitness. If you want to increase strength, it seems you should focus on eccentric contraction.

In order to study whether the eccentric contraction exercise is more suitable for the immovable arm, the researchers invited 18 men and 12 women, ages between 18 - 34, and asked them to live with one arm sling for 8 hours a day (including driving, bathing and sleeping). This study lasted one month.

10 people in this group do nothing, living like a man with a broken arm. The remaining 20 people were divided into two groups, 10 people practiced three times a week, and the training was a mixture of centripetal and centripetal. And the other 10 people only do eccentric training.

At the end of the month, different standard studies were conducted on the biceps that the entire group of people did not move, including girth, strength and neural input.

"Participants undergoing eccentric training have the greatest increase in the muscle strength of their arms, so this training method has a very powerful cross-migration effect." said Ken Kazunori Nosaka, one of the researchers.