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Age-based prediction equations of maximal heart rate (HR max ), such as the popular formulas Fox's 220-age, or Tanaka's 208-0.7 × age, have been widely used in various populations. Surprisingly, so far these equations have not been validated in marathon runners, despite the importance of the role of HR max  for training purposes in endurance running. The aim of the present study was to examine the validity of Fox and Tanaka equations in a large sample of women and men recreational marathon runners. Participants ( n  = 180, age 43.2 ± 8.5 years, VO 2max  46.8 mL/min/kg, finishers in at least one marathon during the last year) performed a graded exercise test on a treadmill, where HR max  was measured. Measured HR max  correlated largely with age in the total sample ( r  = −0.50,  p  < 0.001), women ( r  = −0.60,  p  < 0.001) and men ( r  = −0.53,  p  < 0.001). In women, a large main effect of method on HR max  ( p  = 0.001, η 2  = 0.294) was shown with measured HR max  lower than Fox-HR max  (−4.8 bpm; −8.4, −1.3) and Tanaka-HR max  (−4.9 bpm; −8.1, −1.8). In men, a moderate effect of assessment method on HR max  was found ( p  = 0.001, η 2  = 0.066) with measured HR max  higher than Fox-HR max  (+2.8; 1.0, 4.6), Tanaka-HR max  higher than Fox-HR max  (+1.2; 0.7, 1.7). Based on these findings, it was concluded that Fox and Tanaka' formulas overestimated HR max  by ~5 bpm in women, whereas Fox underestimated HR max  in men by ~3 bpm. Thus, we recommend the further use of Tanaka's formula in men marathon runners. In addition, exercise physiologists and sport scientists should consider the observed differences among various assessment methods when performing exercise testing or prescribing training program relying on HR.

Age-Predicted Maximal Heart Rate in Recreational Marathon Runners: A Cross-Sectional Study on Fox's and Tanaka's Equations