Epidemiology of muscle mass loss with age / Marjolein Visser -- Definitions of sarcopenia / John E. Morley and Alfonso J. Cruz-Jentoft -- Muscle biology and mTORC1 signaling in aging / Blake B. Rasmussen and Elena Volpi -- The role of the nervous system in muscle atrophy / Minal Bhanushali [and others] -- Nutrition, protein turnover, and muscle mass / Stephane Walrand, Christelle Guillet, and Yves Boirie -- The complex relation between muscle mass and muscle strength / Todd M. Manini, David W. Russ, and Brian C. Clark -- Is sarcopenia a geriatric syndrome? / Jean-Pierre Michel and Alfonso J. Cruz-Jentoft -- Adverse outcomes and functional consequences of sarcopenia / David R. Thomas -- A lifecourse approach to sarcopenia / Avan Aihie Sayer -- Cachexia and sarcopenia / Maurizio Muscaritoli, Simone Lucia, and Filippo Rossi Fanelli -- Sarcopenia and frailty / Cornel C. Sieber -- Sarcopenia, osteoporosis, and fractures / Tommy Cederholm -- Sarcopenic obesity / Mauro Zamboni, Andrea P. Rossi, and Elena Zoico -- Imaging of skeletal muscle / Thomas F. Lang -- Measurements of muscle mass, equations, and cut-off points / Marjolein Visser and Laura Schaap -- Measurement of muscle strength and power / Michael Drey and Jurgen M. Bauer -- Measurements of physical performance / Rolland Yves, Abellan van Kan, and Cesari Matteo -- Exercise interventions to improve sarcopenia / Mark D. Peterson and Jose A. Serra -- Nutritional approaches to treating sarcopenia / Douglas Paddon-Jones and Luc van Loon -- The future of drug treatments / Francesco Landi, Yves Rolland, and Graziano Onder -- Sarcopenia : is it preventable? / Maurits Vandewoude and Ivan Bautmans.