What is the Ventilatory Threshold 2 (VT2) and Why Does it Matter in Exercise?

What is the Ventilatory Threshold 2 (VT2)?

The Ventilatory Threshold 2 (VT2) is a measurement used by exercise physiologists to determine an individual's ability to sustain exercise at higher intensities. It is typically defined as the point at which there is a sharp increase in the amount of carbon dioxide being produced by the body, and the corresponding increase in the amount of oxygen being consumed no longer keeps up with that production. This is also known as the anaerobic threshold.

Why Does it Matter in Exercise?

Knowing an individual's VT2 can be valuable in designing an exercise program that is specific to their fitness level and goals. This threshold is important for several reasons:

• It helps determine an appropriate training intensity for athletes and recreationally active individuals alike.
• Sustained exercise above the VT2 requires the body to rely more heavily on non-aerobic energy systems, leading to an accumulation of lactic acid and fatigue. Knowing an individual's VT2 can help them understand how to pace themselves during high-intensity exercise to avoid early fatigue.
• VT2 is also useful in predicting an individual's performance in certain endurance events, such as cycling or running. A higher VT2 generally correlates with a greater ability to maintain a high intensity for a longer period of time.

FAQs

How is VT2 measured?

VT2 is typically measured through a test called the ventilatory threshold test. This test is usually done using an ergometer, such as a stationary bike or treadmill, with the individual's oxygen consumption and carbon dioxide production being closely monitored during the test. The point at which there is a sharp increase in carbon dioxide production is used to determine the individual's VT2.

What factors can affect an individual's VT2?

Several factors can influence an individual's VT2, including genetics, training status, and age. Endurance training has been shown to increase an individual's VT2, while detraining can decrease it. Age-related declines in VT2 have also been observed in some studies.

Can an individual increase their VT2?

Yes, an individual can increase their VT2 through consistent endurance training. Exercise programs that focus on high-intensity intervals and sustained bouts of exercise at or near the VT2 have been shown to improve an individual's performance and increase their VT2.