For most people, retesting every three to six months is enough, timed for the end of a training block. Fitness changes slowly, so testing more often than every couple of months rarely shows a meaningful difference.
The best schedule depends on why you are testing. Your first test is your baseline; later tests show whether your training is working and keep your heart rate zones current.
Good times to retest
- After 8 to 12 weeks of consistent, structured training
- At the start of a new season or before building toward an event
- When your training zones feel too easy or too hard
- After a long break, an injury or an illness, once you are back to regular training
- About once a year if you are tracking fitness for long-term health
When to wait
- You have trained inconsistently since your last test
- You are sick, injured or unusually tired
- You are in the final days before a race, when a maximal effort would get in the way
Keeping results comparable
Small differences between tests can come from the conditions and not from your fitness. To compare fairly:
- Use the same equipment: treadmill or bike, the same as last time
- Test at a similar time of day
- Prepare the same way for food, caffeine, sleep and training the day before
- Wear similar shoes and clothing
Preparation tips are in how do I prepare for a VO2 max test?
What counts as real progress
A change of a point or two can be normal day-to-day variation. Look for a clear shift, and look at more than the headline number: being able to hold a faster pace or higher power at the same heart rate is progress even when VO2 max barely moves.
Safety
A VO2 max test is a maximal effort. If you have a heart condition, new chest pain, or have been told to avoid hard exercise, speak with your doctor first.
Fees are on our Pricing page. More detail is on the VO2 max testing page.
Due for a retest?