title: [The maximum heart rate in the exercise test: the 220-age formula or Sheffield's table?].
abstract: OBJECTIVE
  To determine in the maximum cardiac rate in exercise test of apparently healthy individuals may be more properly estimated through 220-age formula (Astrand) or the Sheffield table.
  
  
  METHODS
  Retrospective analysis of clinical history and exercises test of apparently healthy individuals submitted to cardiac check-up.
  
  
  METHODS
  Sequential sampling of 170 healthy individuals submitted to cardiac check-up between April 1988 and September 1992.
  
  
  METHODS
  Comparison of maximum cardiac rate of individuals studied by the protocols of Bruce and modified Bruce, in interrupted exercise test by fatigue, and with the estimated values by the formulae: 220-age versus Sheffield table.
  
  
  RESULTS
  The maximum cardiac heart rate is similar with both protocols. This parameter in normal individuals is better predicted by the 220-age formula.
  
  
  CONCLUSIONS
  The theoretic maximum cardiac heart rate determined by 220-age formula should be recommended for a healthy, and for this reason the Sheffield table has been excluded from our clinical practice.
authors.affiliation: Instituto do Coração, Carnaxide, Lisboa.
authors.forename: A
authors.initials: A
authors.lastname: Mesquita
authors.forename: M
authors.initials: M
authors.lastname: Trabulo
authors.forename: M
authors.initials: M
authors.lastname: Mendes
authors.forename: J F
authors.initials: JF
authors.lastname: Viana
authors.forename: R
authors.initials: R
authors.lastname: Seabra-Gomes
mesh_terms: D000328:Adult; D000368:Aged; D000375:Aging; D004562:Electrocardiography / Q000295:instrumentation / Q000379:methods; D005080:Exercise Test / Q000295:instrumentation / Q000379:methods* / Q000706:statistics & numerical data; D005260:Female; D006339:Heart Rate; D006801:Humans; D008297:Male; D008875:Middle Aged; D012016:Reference Values; D012044:Regression Analysis; D012189:Retrospective Studies
vernacular_title: Frequência cardíaca máxima na prova de esforço: 220-idade ou tabela de Sheffield?