title: Longitudinal changes in cardiorespiratory fitness: measurement error or true change?
authors.forename: Paul T
authors.initials: PT
authors.lastname: Williams
mesh_terms: D002320:Cardiovascular Physiological Phenomena; D003627:Data Interpretation, Statistical; D006801:Humans; D008137:Longitudinal Studies; D010809:Physical Fitness / Q000502:physiology*; D012143:Respiratory Physiological Phenomena