Average Time on Treadmill for Stress Test by Age (Complete Guide)
Learn the average treadmill stress test duration by age group. Includes Bruce protocol stages, what to expect, and how age affects your test results.
Most adults last about 6–12 minutes on a Bruce protocol treadmill stress test, which is the range labs design the test around. For healthy adults, a median fitness level corresponds to roughly 13 minutes for men in their 20s down to about 7½ minutes in their 70s, and about 9½ down to 5 minutes for women. In a study of over 2,000 patients older than 75, the median time at age 76–80 was 7:22 for men and 6:00 for women.
A treadmill stress test (also called an exercise stress test or cardiac stress test) measures how well your heart handles physical exertion. Below you can turn your own test time into METs and an estimated VO2max, then compare it with people of your age and sex. Use our Treadmill Pace & Speed Calculator to understand the speeds used during testing.
Medical disclaimer: A treadmill stress test is a clinical test done under medical supervision, and only your doctor can interpret it. The calculator below only converts the time from a test you have already completed into an estimate of fitness. It says nothing about your ECG, blood pressure, symptoms or heart disease risk, and it is not a reason to change medication or to do a maximal test on your own. If you have chest pain, shortness of breath or dizziness, seek medical care.
Bruce protocol calculator: time → VO2max and METs
For a completed standard Bruce test. Enter the total time you walked or ran, as shown on your report.
Estimated VO2max30.1 ml/kg/min
Estimated METs8.6
Stage reached3 (3.4 mph, 14%)
Fitness for ageBelow average
9:00 on the Bruce protocol ≈ 30.1 ml/kg/min (Foster 1984 equation for men). That is about the 39th percentile for men aged 50–59 in the FRIEND registry (median 32.6 ml/kg/min). Typical target heart rate for the test (85% of 220 − age): 145 bpm.
Estimate only. Holding the handrails or a modified Bruce protocol makes it too high. It does not replace your cardiologist's reading of the ECG, blood pressure and symptoms.
How the calculator works: VO2max is estimated from total time on the standard Bruce protocol with the equations listed in ACSM's Guidelines for Exercise Testing and Prescription: for men, VO2max = 14.76 − 1.379T + 0.451T² − 0.012T³ (Foster et al., 1984); for women, VO2max = 4.38T − 3.90 (Pollock et al., 1982), with T in minutes. METs = VO2max ÷ 3.5. The fitness category compares your estimate with treadmill VO2max percentiles for your age and sex from the FRIEND registry, which measured 7,783 treadmill tests in healthy US adults (Kaminsky et al., 2015): below the 10th percentile is "very low", 10th–25th "low", 25th–50th "below average", 50th–75th "above average", 75th–90th "high" and 90th+ "very high". Estimates are too high if you held the handrails, and the equations do not apply to the modified Bruce protocol.
What is a Treadmill Stress Test?
A treadmill stress test monitors your heart's electrical activity, blood pressure, and symptoms while you walk or run on a treadmill. The test typically follows a standardized protocol where speed and incline increase at regular intervals until you reach your target heart rate or can't continue.
The test is used to:
- Diagnose coronary artery disease
- Evaluate exercise tolerance
- Assess heart rhythm abnormalities
- Determine safe exercise intensity
- Monitor existing heart conditions
Average Stress Test Duration by Age and Sex
There is no single official "normal time by age" table for the Bruce protocol. The table below turns published fitness norms into Bruce times: it takes the median (and 25th–75th percentile) treadmill VO2max for each age and sex from the FRIEND registry (Kaminsky et al., 2015) and converts it to test time with the Foster (men) and Pollock (women) equations above. Times are rounded to 5 seconds.
| Age | Men: median time | Men: 25th–75th percentile | Women: median time | Women: 25th–75th percentile | Median METs (men / women) |
|---|---|---|---|---|---|
| 20–29 | 13:20 | 11:25–15:00 | 9:30 | 7:50–11:05 | 13.7 / 10.7 |
| 30–39 | 12:00 | 10:25–13:35 | 7:45 | 6:40–9:10 | 12.1 / 8.6 |
| 40–49 | 10:55 | 9:25–12:35 | 7:00 | 5:55–8:15 | 10.8 / 7.6 |
| 50–59 | 9:40 | 8:10–11:20 | 6:15 | 5:25–7:10 | 9.3 / 6.7 |
| 60–69 | 8:30 | 7:10–10:05 | 5:25 | 4:50–6:20 | 8.1 / 5.7 |
| 70–79 | 7:25 | 6:05–9:05 | 5:05 | 4:25–5:40 | 7.0 / 5.2 |
How to read it: a 55-year-old man who lasted 9:40 is right at the median for his age; one who lasted 11:20 or more is in the top quarter. FRIEND participants were healthy volunteers without known heart or lung disease, so people referred for a clinical stress test often score lower.
Men vs. Women
At every age, the median test time for women is shorter than for men, because women have a lower average VO2max. The equations also differ: at the same time on the treadmill, the women's equation gives a higher VO2max than the men's, so a woman and a man who both stop at 9:00 get about 35.5 and 30.1 ml/kg/min.
Stress Test Times After 75
The best data for older adults comes from a Columbia University study of 2,041 patients older than 75 who completed a clinically indicated Bruce test with maximal effort and no ischemia (Lander et al., 2022):
| Measure (age >75) | Men | Women |
|---|---|---|
| Median time at age 76–80 | 7:22 | 6:00 |
| Mean METs achieved | 7.7 | 6.5 |
| Completed stage 1 (3 min) | 95% | 85% |
| Completed stage 2 (6 min) | 64% | 32% |
| Completed stage 3 (9 min) | 15% | 3% |
Exercise time fell further with age after 80, and fewer than 1% of patients completed stage 4. The men's 7:22 lines up well with the 7:25 median for men aged 70–79 in the table above.
The Bruce Protocol Explained
The Bruce Protocol is the most commonly used treadmill stress test in the United States. It consists of 3-minute stages with progressively increasing speed and incline:
| Stage | Time (cumulative) | Speed (mph) | Speed (km/h) | Incline (%) | MET Level |
|---|---|---|---|---|---|
| 1 | 0-3 min | 1.7 | 2.7 | 10% | 4.6 |
| 2 | 3-6 min | 2.5 | 4.0 | 12% | 7.0 |
| 3 | 6-9 min | 3.4 | 5.5 | 14% | 10.1 |
| 4 | 9-12 min | 4.2 | 6.8 | 16% | 12.9 |
| 5 | 12-15 min | 5.0 | 8.0 | 18% | 15.0 |
| 6 | 15-18 min | 5.5 | 8.9 | 20% | 16.9 |
| 7 | 18-21 min | 6.0 | 9.7 | 22% | 19.1 |
Most people complete the test between stages 2-5, with elite athletes potentially reaching stages 6-7. The MET values in the table are the approximate energy cost of walking or running each stage at a steady state. Because each stage lasts only 3 minutes, the time-based equations in the calculator give somewhat different values for the same point in the test.
Modified Bruce Protocol
For older adults, those with limited mobility, or individuals with known heart conditions, the Modified Bruce Protocol starts at a lower intensity:
| Stage | Speed (mph) | Incline (%) | Who It's For |
|---|---|---|---|
| 0 | 1.7 | 0% | Warm-up stage |
| 0.5 | 1.7 | 5% | Very deconditioned |
| 1 | 1.7 | 10% | Standard start |
This modified version adds two preliminary stages before transitioning to the standard Bruce Protocol, making it more accessible for:
- Adults over 70
- People with mobility limitations
- Those recovering from cardiac events
- Individuals with very low fitness levels
Factors That Affect Test Duration
Fitness Level (Most Important)
Your cardiorespiratory fitness has a bigger impact than age alone. This is what different finishing times correspond to, using the same equations as the calculator:
| Total time | Men: VO2max / METs | Women: VO2max / METs |
|---|---|---|
| 3:00 | 14.4 / 4.1 | 9.2 / 2.6 |
| 6:00 | 20.1 / 5.8 | 22.4 / 6.4 |
| 8:00 | 26.4 / 7.6 | 31.1 / 8.9 |
| 9:00 | 30.1 / 8.6 | 35.5 / 10.1 |
| 10:00 | 34.1 / 9.7 | 39.9 / 11.4 |
| 12:00 | 42.4 / 12.1 | 48.7 / 13.9 |
| 15:00 | 55.1 / 15.7 | 61.8 / 17.7 |
VO2max in ml/kg/min. Very short times are the least accurate: the women's equation gives values at 3 minutes that are below the energy cost of stage 1.
Medications
Certain medications affect heart rate response:
- Beta-blockers - May limit heart rate increase, affecting duration
- Calcium channel blockers - Can reduce exercise capacity
- Nitrates - May improve exercise tolerance
Your doctor may ask you to stop certain medications before the test.
Health Conditions
Pre-existing conditions can shorten test duration:
- Coronary artery disease
- Heart valve problems
- Peripheral artery disease
- Lung conditions (COPD, asthma)
- Arthritis or joint problems
- Obesity
Test Purpose
The endpoint varies based on why you're being tested:
- Diagnostic tests - Continue until target heart rate or symptoms
- Functional capacity tests - Push to maximum tolerable exertion
- Pre-surgical evaluation - May have specific MET targets
What Happens During the Test
Before the Test
- Electrodes placed on chest (ECG monitoring)
- Blood pressure cuff attached
- Baseline readings recorded
- Brief warm-up walk
During the Test
- Speed and incline increase every 3 minutes
- ECG continuously monitored
- Blood pressure checked each stage
- You report any symptoms (chest pain, dizziness, fatigue)
Stopping Criteria
The test ends when you:
- Reach 85-100% of age-predicted maximum heart rate
- Experience significant symptoms
- Show concerning ECG changes
- Request to stop due to fatigue
- Complete the protocol (rare)
After the Test
- Cool-down walk at slow pace
- Continued monitoring for 5-10 minutes
- Recovery heart rate and blood pressure recorded
How to Prepare for Your Stress Test
24-48 Hours Before
- Avoid caffeine (coffee, tea, energy drinks, chocolate)
- Get adequate sleep
- Stay hydrated
- Avoid heavy meals
Day of Test
- Wear comfortable walking/running shoes
- Dress in loose, comfortable clothing
- Eat a light meal 2-3 hours before
- Bring a list of current medications
- Arrive 15-30 minutes early
What to Bring
- Photo ID
- Insurance information
- Referral paperwork
- List of medications and dosages
- Comfortable athletic shoes
Interpreting Your Results
Duration and METs
Your time only means something relative to your age and sex, so use the calculator or the age table rather than a single cut-off. As a rough guide, labs aim for a test of about 6–12 minutes (StatPearls: Treadmill Stress Testing), so a test that ends well before 6 minutes because of fatigue suggests low exercise capacity.
MET Achievement
METs (metabolic equivalents; 1 MET = 3.5 ml of oxygen per kg per minute) are the standard way to report exercise capacity. Exercise capacity is one of the strongest predictors of long-term health: in 6,213 men referred for treadmill testing, peak METs predicted the risk of death better than other established risk factors, and each 1-MET increase in exercise capacity was linked to a 12% improvement in survival (Myers et al., 2002).
Commonly used rough bands:
- < 5 METs - Low functional capacity
- 5-7 METs - Moderate capacity
- 7-10 METs - Good functional capacity
- > 10 METs - High capacity
What Your Doctor Looks For
- ECG changes suggesting reduced blood flow
- Abnormal heart rhythms
- Blood pressure response
- Symptom development
- Recovery patterns
Improving Your Stress Test Performance
If you're concerned about your test duration, regular cardiovascular exercise can improve your results:
Recommended Training
| Activity | Frequency | Duration |
|---|---|---|
| Brisk walking | 5x/week | 30 min |
| Jogging | 3-4x/week | 20-30 min |
| Cycling | 3-4x/week | 30-45 min |
| Swimming | 3x/week | 30 min |
How much your time improves depends on your starting fitness and health. Check with your doctor before starting a new exercise program if you have, or are being tested for, a heart condition.
Use our Treadmill Calorie Calculator to track your training sessions and ensure you're building cardiovascular fitness effectively.
When to Be Concerned
Contact your doctor if during or after training you experience:
- Chest pain or pressure
- Unusual shortness of breath
- Dizziness or lightheadedness
- Irregular heartbeat
- Excessive fatigue
Conclusion
Most people last 6–12 minutes on a Bruce treadmill stress test. A median fitness level corresponds to roughly 13 minutes for men and 9½ minutes for women in their 20s, falling to about 7½ and 5 minutes in their 70s. Your fitness level matters more than your age: a fit 65-year-old may outperform a sedentary 40-year-old.
Understanding what to expect helps reduce anxiety and allows you to prepare appropriately. If you're training to improve your cardiovascular fitness before a stress test, use our Treadmill Calorie Calculator to track your workouts and our Treadmill Pace & Speed Calculator to understand the speeds used during the Bruce Protocol stages.
Remember: The goal isn't to "pass" the stress test—it's to give your doctor accurate information about your heart's function under exertion.
Frequently Asked Questions
How long do most people last on a treadmill stress test?
Most people last 6–12 minutes on the Bruce protocol, which is what labs aim for. Healthy men in their 40s have a median of about 11 minutes and healthy women about 7 minutes; after 75 the median is about 7:22 for men and 6:00 for women.
What is a good METs score on a stress test?
It depends on age and sex. The median for healthy adults is about 11 METs for men and 7.6 METs for women in their 40s, and about 7 and 5 METs in their 70s (FRIEND registry). More than 10 METs is high capacity at almost any age.
How do you calculate VO2max from a Bruce test?
With T as total minutes: men VO2max = 14.76 − 1.379T + 0.451T² − 0.012T³ (Foster 1984); women VO2max = 4.38T − 3.90 (Pollock 1982). Divide by 3.5 to get METs. Holding the handrails makes the estimate too high.
Sources
- Bruce RA, Kusumi F, Hosmer D. Maximal oxygen intake and nomographic assessment of functional aerobic impairment in cardiovascular disease. American Heart Journal 1973;85(4):546-562. doi:10.1016/0002-8703(73)90502-4. The original Bruce protocol paper.
- Foster C, Jackson AS, Pollock ML, et al. Generalized equations for predicting functional capacity from treadmill performance. American Heart Journal 1984;107(6):1229-1234. doi:10.1016/0002-8703(84)90282-5
- Pollock ML, Foster C, Schmidt D, et al. Comparative analysis of physiologic responses to three different maximal graded exercise test protocols in healthy women. American Heart Journal 1982;103(3):363-373. doi:10.1016/0002-8703(82)90275-7
- Kaminsky LA, Arena R, Myers J. Reference standards for cardiorespiratory fitness measured with cardiopulmonary exercise testing: data from FRIEND. Mayo Clinic Proceedings 2015;90(11):1515-1523. doi:10.1016/j.mayocp.2015.07.026
- Lander BS, Layton AM, Garofano RP, et al. Average exercise capacity in men and women >75 years of age undergoing a Bruce protocol exercise stress test. American Journal of Cardiology 2022;164:21-26. doi:10.1016/j.amjcard.2021.10.020
- Myers J, Prakash M, Froelicher V, et al. Exercise capacity and mortality among men referred for exercise testing. New England Journal of Medicine 2002;346(11):793-801. doi:10.1056/NEJMoa011858
- Vilcant V, Zeltser R. Treadmill Stress Testing. StatPearls, updated 2023.
This article is general information, not medical advice. Talk to your doctor about your own test results.