After doing heavy weight training, if women who’ve never trained before use a tight band around their arm afterward, their arm muscles don’t get any thicker—but men’s muscles still grow normally.

Some people grow more muscle with regular heavy lifting, others grow just as much or more with heavy lifting plus blood flow restriction — there’s no one-size-fits-all answer.

If you're a young guy new to weightlifting and you use a blood pressure cuff to restrict blood flow while lifting, it doesn't matter whether you squeeze the cuff while you're pushing the weight up or while you're resting between sets—either way, you'll gain the same amount of strength and muscle.

If you use a tight band on your arm or leg while lifting heavy weights or resting between sets, it won’t make your muscles work harder—measured by electrical signals—when you’re a young guy who hasn’t trained before.

Some people grow more muscle with regular heavy lifting, others grow just as much or more when they add blood flow restriction — there’s no one-size-fits-all answer.

If you're new to lifting weights and do bicep curls with heavy weights, then wrap your arm tightly after exercising, you might end up with slightly less muscle growth in your upper arm compared to not wrapping it at all.