title: [The validity of the estimated maximal oxygen intake by different indirect methods in middle-aged and elderly men].
mesh_terms: D000368:Aged; D005080:Exercise Test; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008722:Methods; D008875:Middle Aged; D010100:Oxygen / Q000502:physiology*; D012044:Regression Analysis; D012119:Respiration
chemical_list: D010100:Oxygen