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Five Reasons Why Your Vo2 Max Is Decreasing

In this article, we will take a close look at the factors that can lead to a decrease in VO2 max, a key indicator of cardiovascular fitness. We will discuss the role of physiological factors such as age, sex, and heart rate, as well as the impact of lifestyle choices and certain health conditions. We will also explain the importance of the recovery phase in maintaining and improving VO2 max.

Jakub Gwiazdecki

Author - Jakub Gwiazdecki

Fifth year medical student at the Medical Faculty of Comenius University in Bratislava.

Jakub used MediSearch to find sources for this blog.
MediSearch gives instant answers to medical questions based on 30 million scientific articles.

Five Reasons Why Your VO2 Max Is Decreasing

Aging

One reason for your VO2 max decrease is the physiological factor of aging. Men’s VO2 max decreases by roughly 0.43 ml/kg/min and women’s VO2 max by 0.3 ml/kg/min with each year [1].

The direct reason for this decrease in VO2 max with age is the physiological change in the muscles. It leads to a decrease in the oxygen capacity in the muscle [2].

Heart

The heart itself can cause VO2 max to decrease. The physiological age limits its rate. The older you are, the less beats per minute your heart can achieve. The maximal heart rate can be estimated in two ways.

  • 220 – your age = maximal heart rate.
  • 207 - 0.7 x your age = maximal heart rate

The second equation is considered more precise than the first.

For a 25-year-old man, the maximal heart rate will be between 190 and 195 beats per minute.

Furthermore, the heart needs training as any other muscle. Prolonged bed stay or break from physical activity lead to changes in the heart. The VO2 max after a long break will decrease as the heart adjusts to low blood demand in the body [3].

However, the decrease in VO2 max caused by prolonged inactivity is transient. You will regain the lost VO2 max after resuming training.

Not enough recovery

Another reason why your VO2 max is decreasing is not enough recovery. In the pursuit of progress, recovery can easily be forgotten.

During recovery, the organism rebuilds the muscles and ligaments, and the heart has time to recover. You can help the muscles during this process with good sleep, a healthy and balanced diet, and rest.

Without a proper recovery phase, not only your muscles will still be sore. You can also overtrain your body and, with it, cause a decrease in VO2 max.

Lower hemoglobin concentration

A decrease in VO2 max can be caused by low hemoglobin concentration. A small amount of hemoglobin limits the oxygen capacity of the blood, thus the VO2 max decreases. A situation like this can happen, for example, in vegetarians and women with intensive menstruation [2, 4].

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