So they do not need to gain a significant amount of muscle mass in order to build strength. (completethecircuit.com)
While it can be difficult to put on a large amount of muscle mass while in a calorie deficit, you can certainly accomplish both goals concurrently. (coachcalorie.com)
Or more specifically it can limit any muscle loss to the smallest amount possible (if you are on a prolonged diet you'll still lose a small amount of muscle mass). (healthtrends.com)