title: Letter: Cardiorespiratory fitness.
mesh_terms: D000328:Adult; D002170:Canada; D006306:Health Surveys / Q000592:standards*; D006321:Heart / Q000502:physiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D009765:Obesity / Q000503:physiopathology; D010101:Oxygen Consumption; D010809:Physical Fitness; D012119:Respiration; D013223:Statistics as Topic; D013548:Sweden