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[The maximum heart rate in the exercise test: the 220-age formula or Sheffield's table?]
A Mesquita1, M Trabulo, M Mendes
1Instituto do Coração, Carnaxide, Lisboa.
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.
Design:
Retrospective analysis of clinical history and exercises test of apparently healthy individuals submitted to cardiac check-up.
Participants:
Sequential sampling of 170 healthy individuals submitted to cardiac check-up between April 1988 and September 1992.
Material And 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.