The term "tissue mass" refers to a clump or cluster of various tissues in the body. It can be a group of cells that are similar or related in function and structure. Full definition
Several studies have shown when creatine supplementation is used in combination with resistance training there was an increase in lean tissue mass and muscle strength in aging adults. (blog.nasm.org)
Research shows that supplementation with whey protein during resistance training increases lean tissue mass faster compared with resistance training alone. (aminoacidstudies.org)
All of your lean tissue mass contains a substantive amount of nitrogen, and if you lose that — you lose muscle. (roids.co)