World J Mens Health.  2021 Oct;39(4):666-672. 10.5534/wjmh.200055.

Estimating Maximal Oxygen Uptake from the Ratio of Heart Rate at Maximal Exercise to Heart Rate at Rest in Middle-Aged Men

• Voutilainen A
• Setti MO
• Tuomainen TP

• KMID: 2519908
• DOI: http://doi.org/10.5534/wjmh.200055

Abstract

Purpose
To estimate the maximum mass-specific oxygen uptake (VO_2max) from the ratio of the heart rate at maximal exercise (HR_max) to heart rate at rest (HR_rest) in middle-aged men. VO_2max is an essential measure of cardiorespiratory fitness, but it is difficult to utilize in clinical practice. The proportionality factor HR_max to HR_rest is known to approximate 15 in young welltrained adults. Presumably, the same value is inaccurate for middle-aged men.
Materials and Methods
Six-hundred thirty-four men belonging to the Kuopio Ischaemic Heart Disease Risk Factor Study. Their mean age, body mass index (BMI), the daily total physical activity (TPA), VO_2max , HR_max , and HR_rest were: 49.4±6.4 years, 26.3±3.2 kg/m 2 , 48.5±10.1 metabolic equivalent hours per day, 33.7±7.6 mL/min/kg, 170.1±15.4 beats/min, and 63.3±10.8 beats/min. They included never-smokers 38%, former smokers 29%, and current smokers 33%.
Results
The proportionality factor HR_max to HR_rest in around 50-year-old men approximated 12. One year in age, one step change in BMI (normal weight, overweight, obese), smoking status (never, former, current), and TPA (moderately active, active, highly active) reduced the proportionality factor by 0.1, 0.6, 0.4, and 0.1, respectively. The proportionality factor in obese or current smoking middle-aged men was one point lower compared to normal weight or never-smoking peers. This corresponds to approximately 10 years in chronological age.
Conclusions
In around 50-year-old men with no cardiovascular diseases, bronchial asthma, or cancer, the HR_max to HR_rest ratio should be multiplied by approximately 12 to estimate VO_2max . BMI and smoking status can be considered in calculations to improve accuracy.

Keyword

Healthy lifestyle; Heart rate; Men’s health; Oxygen consumption; Physical exertion