6-Minute Walk Test & VO₂Max Assessment

🏃 6-Minute Walk Test & VO₂Max Assessment

Aerobic Capacity Estimation • SSA Work Capacity Classification • Cardiovascular Recovery

ATS Guidelines (2002) • ACSM Walking Equation • Åstrand & Ryhming (1954) Extrapolation • SSA 20 CFR §404.1567

👤 Patient Information
Complete all fields prior to testing
⚠️ Pre-Test Screening
Complete before commencing — do not proceed if any absolute contraindication is present

🚫 Absolute Contraindications — Do NOT Test

  • Unstable angina or acute myocardial infarction within the preceding 6 weeks
  • Uncontrolled cardiac arrhythmia causing haemodynamic compromise
  • Decompensated heart failure, acute pericarditis, or myocarditis
  • Severe symptomatic aortic stenosis or acute pulmonary embolism
  • Resting systolic BP >200 mmHg or diastolic BP >110 mmHg
  • Acute musculoskeletal injury or severe pain precluding safe ambulation
  • Acute systemic illness or fever; resting SpO₂ <85%

⚠️ Patient Preparation (communicate 24 hours prior)

  • Wear supportive, non-slip footwear appropriate for walking; comfortable clothing
  • No strenuous exercise in the 24 hours prior to testing
  • No large meal within 2 hours; avoid caffeine and alcohol on the day of assessment
  • Continue usual medications unless directed otherwise by the prescribing physician
  • Arrive at least 10 minutes early to rest quietly before baseline measurements are recorded
  • Bring any walking aid routinely used (cane, rollator) — document its use
Pre-Test Baseline Measurements
Required for predicted 6MWD reference
Optional — pulse oximetry
Blunts HR response — affects VO₂Max validity
🏃 6-Minute Walk Test — Protocol
American Thoracic Society (ATS) Committee on Proficiency Standards for Clinical Pulmonary Function Laboratories (2002)

📋 Course Setup & Equipment

  • Use a flat, straight, hard-surfaced indoor corridor of 30 metres in length. Mark each turnaround point with a cone and place tape on the floor at the start/finish.
  • If a 30 m corridor is not available, document the actual corridor length used (minimum 15 m); note this in the assessment record as it may affect distance achieved.
  • Equipment: stopwatch or countdown timer (6 minutes), lap counter or tally sheet, HR monitor or pulse oximeter, chair for immediate post-test seating, emergency plan accessible throughout.
  • Ensure the corridor is free of obstacles and foot traffic for the duration of the test.

▶ Administration Protocol

  1. Have the patient rest seated in a chair near the start for at least 10 minutes before commencing. Record resting HR, BP, and SpO₂ during this time.
  2. Do not perform a warm-up walk before the test.
  3. Read the following standardised instructions aloud immediately before starting:
    "The object of this test is to walk as far as possible for 6 minutes. You will walk back and forth in this hallway. Six minutes is a long time to walk, so you will be exerting yourself. You are permitted to slow down, stop, and rest as necessary. You may lean against the wall while resting, but resume walking as soon as you are able. You will be walking back and forth around the cones. I will let you know when time is up and when to stop where you are."
  4. Position yourself at the start line with the patient. Start the timer when the patient begins to move.
  5. Walk behind the patient at a comfortable distance; do not walk alongside or ahead (this may encourage a faster pace).
  6. Deliver the standardised encouragement phrases (below) at each minute. Use a neutral tone. Do not use other phrases or non-verbal encouragement.
  7. Count and record each completed lap. Mark the patient’s final position on a course diagram if the last lap is incomplete.
  8. At 6 minutes: call "Stop right where you are." Mark the patient’s stopping point, then measure the total distance to the nearest metre. Immediately record HR₀ and SpO₂ within 15 seconds of stopping.
  9. Have the patient sit down immediately in the adjacent chair for recovery monitoring.

💬 Standardised Encouragement Script (ATS, 2002)

1 minute"You are doing well. You have 5 minutes to go."
2 minutes"Keep up the good work. You have 4 minutes to go."
3 minutes"You are doing well. You are halfway done."
4 minutes"Keep up the good work. You have only 2 minutes left."
5 minutes"You are doing well. You have only 1 minute to go."
15 sec remaining"In a moment I am going to tell you to stop. When I do, just stop right where you are and I will come to you."

🛑 Stop Test Immediately If:

  • Chest pain, pressure, or tightness
  • Intolerable dyspnoea or severe leg cramps
  • Staggering, loss of coordination, or signs of imminent collapse
  • Diaphoresis with pallor or cyanosis
  • SpO₂ drops >4% below resting or falls below 85%
  • Patient requests to stop for any reason
Course Configuration
ATS standard: 30 m
📋 Test Data — Enter After Completion
Record within 15 seconds of the patient stopping
Measure to nearest metre including partial lap
Measured within 15 sec of stopping
Optional — pulse oximetry at test end
Target 12–16 for valid submaximal test
📈 Cardiovascular Recovery Data
Heart rate recovery (HRR) is a validated marker of autonomic function and cardiovascular risk (Cole et al., 1999)

⌛ Recovery Protocol

  1. Immediately on stopping, have the patient sit down in the adjacent chair. Do not allow ambulation during the recovery period.
  2. Record HR₀ (above) within 15 seconds of stopping.
  3. At exactly 1 minute post-test, measure and record HR₁ (below) using the same method as HR₀.
  4. Heart Rate Recovery (HRR) = HR₀ − HR₁. An HRR of ≥12 bpm is classified as normal (Cole et al., 1999); values below this threshold are associated with increased all-cause mortality risk and warrant further cardiovascular evaluation.
Measured exactly 60 seconds after stopping