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Published on: June 5, 2019
Are age-predicted equations valid in predicting maximum heart rate in individuals after stroke?
Maria Teresa Ferreira Dos Reis1, Larissa Tavares Aguiar2, Paula da Cruz Peniche1
1Department of Physical Therapy, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil.
Purpose:
To investigate the validity of six age-predicted maximum heart rate (HRmax) equations after stroke.
Material And Methods:
Sixty individuals (54 (12) years; 64 (69) months after stroke) were included. A Cardiopulmonary Exercise Test (CPET) performed on a treadmill obtained the HRmax. The most used age-predicted equations were investigated: (1) 220-age, proposed by Fox; (2) 206.9- (0.67 × age), proposed by Gellish; (3) 208- (0.7 × age), proposed by Tanaka; (4) 216.6- (0.84 × age), proposed by Astrand; (5) 164- (0.72 × age) and (6) 200- (0.92 × age) proposed by Brawner.
Results:
No statistically significant agreement was found between the HRmax obtained by the CPET and the one predicted by the equations 1-5 (-0.18 ≤ 95% confidence interval ≤0.79). A significant and moderate agreement was found between the HRmax obtained by the CPET and the one predicted by equation (6) (95% CI= 0.05-0.75; Intraclass Correlation Coefficient= 0.51). Bland-Altman plots showed that equations (1-4) and (6) overestimated the HRmax. Equation (6) presented the lower mean difference.
Conclusions:
The equations developed for non-disabled individuals (1-4) are not adequate to be used in individuals after a stroke. Equation (6) (Brawner) showed the best results to be used in individuals after stroke; however, it should be used cautiously.
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