When adults do light weight training with restricted blood flow, their slow-twitch muscles grow as much or more than their fast-twitch muscles, which is different from heavy weight training where fast-twitch muscles usually grow more.

When people do light weightlifting with restricted blood flow, their slow-twitch muscles can grow as much or more than their fast-twitch muscles, which is different from heavy lifting where fast-twitch muscles usually grow more.

Using a special training method with lighter weights and restricted blood flow along with heavy lifting might help trained people build more muscle by growing certain muscle fibers better, but different studies have found different results.

When people do light weight training with restricted blood flow very often (at least 5 days a week), their slow-twitch muscle fibers grow bigger faster. Some less frequent training also helps, but not as much.

When adults lift heavy weights, their fast-twitch muscle fibers grow much more than their slow-twitch ones, based on several studies.

Doing light weightlifting with a band that restricts blood flow for six weeks can make both slow and fast muscle fibers in older people grow bigger by about 20%, even without heavy lifting.