( Sarcopenia ( ( means ( loss ( of ( muscle mass ) ) ) ) . ) )
(ROOT (S (NP (NNP Sarcopenia)) (VP (VBZ means) (NP (NP (NN loss)) (PP (IN of) (NP (NN muscle) (NN mass))))) (. .)))
Sarcopenia means loss of muscle mass.
(ROOT (S (NP (NP (NNP Muscle)) (ADJP (RB atrophy) (JJ due) (PP (TO to) (NP (NN age))))) (VP (VBZ is) (VP (VBN called) (NP (NN sarcopenia)))) (. .)))