speed prest in tmt
Reading Document
Medical Text Search
speed protocol treadmill test TMT exercise stress test
Medical Text Search
Bruce protocol modified Bruce treadmill exercise testing stages
GradeResponse
GradeResponse
Speed Protocol in TMT (Treadmill Test)
"Speed protocol" in TMT typically refers to the standard Bruce Protocol, which is the most widely used treadmill exercise testing protocol in clinical practice. It is characterized by progressive increases in both speed (mph) and grade (%) every 3 minutes.
Bruce Protocol — Stages
| Stage | Duration | Speed (mph) | Grade (%) | METs (approx.) |
|---|---|---|---|---|
| 1 | 3 min | 1.7 | 10 | 4–5 |
| 2 | 3 min | 2.5 | 12 | 7 |
| 3 | 3 min | 3.4 | 14 | 10 |
| 4 | 3 min | 4.2 | 16 | 13 |
| 5 | 3 min | 5.0 | 18 | 16 |
| 6 | 3 min | 5.5 | 20 | 19 |
| 7 | 3 min | 6.0 | 22 | 22 |
As per Harrison's Principles of Internal Medicine (p. 7497): "The standard Bruce treadmill protocol begins at 1.7 MPH and 10% gradient and progresses every 3 minutes to a higher speed and elevation."
Key Points
- Target heart rate: 85% of maximum predicted heart rate (MPHR = 220 − age)
- Test duration: Ideally 8–12 minutes (stages 3–4) for optimal diagnostic yield
- Inadequate test: Failure to reach 85% MPHR without symptoms or ECG changes
Modified Bruce Protocol
Used for deconditioned patients, elderly, or post-MI patients. Adds two preliminary stages before Stage 1:
| Stage | Speed (mph) | Grade (%) |
|---|---|---|
| 0 | 1.7 | 0 |
| ½ | 1.7 | 5 |
| 1 (standard) | 1.7 | 10 |
Endpoints / Reasons to Stop TMT
Absolute indications:
- Drop in SBP >10 mmHg with symptoms
- Severe angina
- ST elevation ≥1 mm (non-infarct leads)
- Sustained VT or serious arrhythmias
- Signs of poor perfusion (pallor, cyanosis)
Relative indications:
- ST depression >2 mm
- Increasing chest pain
- Hypertensive response (SBP >250, DBP >115 mmHg)
- Target heart rate achieved
Positive TMT Criteria
| Criterion | Definition |
|---|---|
| ST depression | ≥1 mm horizontal or downsloping, 80 ms after J-point |
| ST elevation | ≥1 mm in non-Q wave leads |
| Symptoms | Angina at low workload |
| Poor exercise capacity | <5 METs |
| BP response | Failure of SBP to rise or drop during exercise |
The Bruce protocol remains the standard for cardiac stress testing due to its well-validated normative data and strong prognostic utility (Harrison's, p. 7497).
speed prest in tmt in kmph
Medical Text Search
Bruce protocol treadmill stages speed kmph kilometers per hour
GradeResponse
Bruce Protocol — Speed in km/h
Converting all stages from mph to km/h (1 mph = 1.609 km/h):
| Stage | Duration | Speed (mph) | Speed (km/h) | Grade (%) | METs |
|---|---|---|---|---|---|
| 1 | 3 min | 1.7 | 2.7 | 10 | ~5 |
| 2 | 3 min | 2.5 | 4.0 | 12 | ~7 |
| 3 | 3 min | 3.4 | 5.5 | 14 | ~10 |
| 4 | 3 min | 4.2 | 6.8 | 16 | ~13 |
| 5 | 3 min | 5.0 | 8.0 | 18 | ~16 |
| 6 | 3 min | 5.5 | 8.9 | 20 | ~19 |
| 7 | 3 min | 6.0 | 9.7 | 22 | ~22 |
Per Harrison's (p. 7497), the Bruce protocol begins at 1.7 mph (≈ 2.7 km/h) at 10% grade and increases speed and grade every 3 minutes.
Modified Bruce Protocol (km/h)
| Stage | Speed (mph) | Speed (km/h) | Grade (%) |
|---|---|---|---|
| Stage 0 | 1.7 | 2.7 | 0 |
| Stage ½ | 1.7 | 2.7 | 5 |
| Stage 1 | 1.7 | 2.7 | 10 |
In the modified protocol, speed stays the same for the first three stages — only the grade increases.
Quick memory aid:
- Stage 1: ~2.7 km/h (slow walk)
- Stage 2: ~4.0 km/h (brisk walk)
- Stage 3: ~5.5 km/h (fast walk)
- Stage 4: ~6.8 km/h (jog)
- Stage 5 onward: running pace (>8 km/h)
Most patients achieve target heart rate by Stage 3–4 (5.5–6.8 km/h).
what is grade in tmt
Grade in TMT means the incline (slope) of the treadmill belt, expressed as a percentage.
Formula
[
\text{Grade (%)} = \frac{\text{vertical rise}}{\text{horizontal distance}} \times 100
]
So:
- 10% grade = treadmill rises 10 units vertically for every 100 units horizontally.
- Higher grade means more uphill effort and higher cardiac workload.
In Bruce protocol
- Stage 1 starts at 10%
- Then increases to 12%, 14%, 16%... every 3 minutes.
Grade and speed together determine exercise intensity (METs) during TMT.
This is a shared conversation. Sign in to Orris to start your own chat.