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Estimation of Running and Cycling VO2max Using the Heart Rate Ratio Method

2019; Lippincott Williams & Wilkins; Volume: 51; Issue: 6S Linguagem: Inglês

10.1249/01.mss.0000560951.11822.6c

1530-0315

Pat R. Vehrs, Sabrina Adams, Kaylee Massey, Nicole D. Tafuna’i, Brady E. Hanson,

Cardiovascular Effects of Exercise

Although the direct measurement of VO2max during an exercise test provides the most accurate assessment of cardiorespiratory fitness, estimates of VO2max are often more practical. Prior research suggests that VO2max obtained during a treadmill maximal graded exercise test can be accurately estimated in men using the Heart Rate Ratio Method. This method estimates VO2max using the following equation: VO2max (mL/kg/min) = (HRmax / HRrest) x 15. The validity of this equation to estimate VO2max has not been established in women or in other modes of exercise, such as cycling. PURPOSE: This study compared VO2max values measured during running and cycling to estimates of VO2max using the Heart Rate Ratio Method in 42 men and women. METHODS: Resting metabolic rate (RMR) and VO2max on the treadmill and cycle ergometer were measured on 21 men and 21 women between 19-39 years of age. Each subject's running and cycling VO2max was estimated using the Heart Rate Ratio Method and their resting HR measured during the RMR test and their actual maximal HR achieved during the maximal exercise tests. RESULTS: The average running and cycling VO2max values for males (54.2 ± 7.1; 50.0 ± 8.9 mL/kg/min) were higher (p<0.0001) than in females (43.4 ± 5.8; 39.8 ± 7.4 mL/kg/min), respectively. Resting HR values for males (55 ± 7 bpm) and females (57 ± 6 bpm) were similar as were the maximal HR values during running (186 ± 12; 190 ± 12 bpm) and cycling (181 ± 11; 184 ± 13 bpm), respectively. The estimates of running and cycling VO2max under-predicted actual values in males (-2.9 ± 8.0; -0.26 ± 7.8 mL/kg/min) and overestimated actual values in females (7.3 ± 7.9; 9.3 ± 8.2 mL/kg/min), respectively. There was a significant gender effect in the prediction of VO2max using the Heart Rate Ratio Method. Regression and Bland Altman analysis for treadmill running yielded an R2 = 0.076, an SEE = 8.19, and a 95% limits of agreement (LOA) of ±18.46 mL/kg/min. Likewise, regression and Bland Altman analysis for cycling yielded an R2 = 0.18, an SEE = 8.85, and a 95% LOA = ±18.24 mL/kg/min. CONCLUSION: The high SEE and LOA precludes this method for predicting running and cycling VO2max. Gender differences in maximal HR and VO2max are not accounted for in predictions of VO2max using the Heart Rate Ratio Method.