5.3 Ebbeling Treadmill & Rockport 1-Mile Walk Protocols

5.3 Ebbeling Treadmill & Rockport 1-Mile Walk Protocols

Two standardized walking protocols are recognized within the CSEP appraisal framework:

1. The Ebbeling Single-Stage Treadmill Walking Protocol: A laboratory-based assessment for apparently healthy adults aged 20 to 59 years, utilizing a motorized treadmill with precise grade and speed control.
2. The Rockport 1-Mile Walk Test (CSEP-PATH "One Mile Walk"): A field-based walking test, originally validated by Kline et al. (1987) in adults aged 30 to 69. It needs only a flat 1-mile course, a stopwatch and a way to measure heart rate.

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The Ebbeling Submaximal Treadmill Protocol

Developed and validated by Dr. Cara Ebbeling and colleagues (1991), this protocol predicts ${\dot{V}\text{O}_2\text{max}}$ using a single submaximal exercise stage following a customized warm-up.

Equipment, Setup, & Safety Rules

• Motorized Treadmill: Must feature adjustable speed increments of $0.1\text{ mph}$ (or $0.1\text{ km/h}$) and electronic elevation adjustable to $5.0\%\text{ grade}$.
• Emergency Safety Lanyard: The trainer must attach the treadmill's emergency shut-off magnetic lanyard securely to the client's clothing prior to initiating the belt.
• Treadmill Familiarization: Sedentary clients often feel unstable on a moving belt. The trainer should demonstrate proper straddling of the belt during startup and instruct the client to maintain an upright posture, looking forward toward the horizon rather than looking down at their feet.
• The Handrail Rule:

Phase 1: Customized Warm-Up (0% Grade, 4 Minutes)

1. The treadmill is initialized at a flat $0.0\%\text{ incline}$.
2. The trainer selects a brisk, comfortable walking pace between $2.0\text{ and }4.5\text{ mph}$ ($3.2\text{ to }7.2\text{ km/h}$):
   • Slower speeds ($2.0–3.0\text{ mph}$) are selected for shorter, older, or sedentary clients.
   • Faster speeds ($3.5–4.5\text{ mph}$) are selected for taller or recreationally active clients.
3. The Target Warm-Up Heart Rate Range: The selected walking speed must elicit a heart rate between 50% and 70% of age-predicted ${\text{HR}_{\max}}$ by the end of the 4th minute:

${\text{Warm-Up Target Range} = 0.50 \times \text{HR}_{\max} \text{ to } 0.70 \times \text{HR}_{\max}}$

In CSEP-PATH, $\text{HR}_{\max}$ is predicted with the Tanaka equation, $208 - (0.7 \times \text{age})$.

1. If the heart rate is $<50\% {\text{HR}_{\max}}$ after 2 minutes, the trainer increases the speed. If the heart rate exceeds $70\% {\text{HR}_{\max}}$, the speed is decreased.
2. By the conclusion of Minute 4, the walking speed is locked in. This speed remains identical throughout the remainder of the test.

Phase 2: Assessment Stage (5.0% Grade, 4 Minutes)

1. At the 4:00 minute mark, the trainer raises the treadmill incline to $5.0\%\text{ grade}$ while maintaining the exact speed established during the warm-up.
2. The client walks at $5.0\%$ grade for 4 minutes (total elapsed test time: 8 minutes).
3. Steady-State Heart Rate ($\text{HR}_{\text{ss}}$) Verification:
   • Heart rate is recorded during the final 15 seconds of Minute 3 (elapsed 7:00) and the final 15 seconds of Minute 4 (elapsed 8:00).
   • Criteria: If the heart rate difference between Minute 3 and Minute 4 is $\le 5\text{ bpm}$, steady state is confirmed. The Minute 4 heart rate is designated as the steady-state heart rate (${\text{HR}_{\text{ss}}}$).
   • Extension Rule: If the heart rate difference is $> 5\text{ bpm}$, the client continues walking at $5.0\%$ grade for an additional 5th minute (elapsed 9:00). Heart rate is recorded at Minute 5, which then serves as ${\text{HR}_{\text{ss}}}$.
4. Once steady state is established, the test concludes, the incline returns to $0\%$, and the client completes the CSEP-PATH standardized recovery protocol (active recovery, then seated recovery, with HR and BP recorded).

The Ebbeling Regression Equation

Predicted relative maximal oxygen uptake (${\dot{V}\text{O}_2\text{max}}$) is calculated using Ebbeling's formula:

${\dot{V}\text{O}_2\text{max} \; (\text{mL}\cdot\text{kg}^{-1}\cdot\text{min}^{-1}) = 15.1 + (21.8 \times \text{Speed}) - (0.327 \times \text{HR}_{\text{ss}}) - (0.263 \times \text{Speed} \times \text{Age}) + (0.00504 \times \text{HR}_{\text{ss}} \times \text{Age}) + (5.98 \times \text{Gender})}$

Where:

• $\text{Speed}$ = Treadmill walking speed in miles per hour (mph) (if measured in $\text{km/h}$, divide by $1.60934$).
• ${\text{HR}_{\text{ss}}}$ = Final steady-state heart rate at $5.0\%$ grade in beats per minute (bpm).
• $\text{Age}$ = Client's age in completed years.
• $\text{Gender}$ = Biological sex coded as 1 for males, 0 for females.

Step-by-Step Worked Example:

A 40-year-old male walks at $3.5\text{ mph}$. At $5.0\%$ grade, his Minute 3 HR is $132\text{ bpm}$ and Minute 4 HR is $134\text{ bpm}$ (difference is $2\text{ bpm} \le 5\text{ bpm}$, steady state confirmed; ${\text{HR}_{\text{ss}} = 134\text{ bpm}}$).

• $\text{Speed} = 3.5$
• ${\text{HR}_{\text{ss}}} = 134$
• $\text{Age} = 40$
• $\text{Gender} = 1$

Calculation:

1. $21.8 \times 3.5 = 76.30$
2. $0.327 \times 134 = 43.818$
3. $0.263 \times (3.5 \times 40) = 0.263 \times 140 = 36.82$
4. $0.00504 \times (134 \times 40) = 0.00504 \times 5360 = 27.0144$
5. $5.98 \times 1 = 5.98$

${\dot{V}\text{O}_2\text{max} = 15.1 + 76.30 - 43.818 - 36.82 + 27.0144 + 5.98 = 43.7564 \approx 43.8\text{ mL}\cdot\text{kg}^{-1}\cdot\text{min}^{-1}}$

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The Rockport 1-Mile Walk Test

Developed by Kline, Porcari, Hintermeister, and colleagues (1987) at the University of Massachusetts, the Rockport 1-Mile Walk Test is one of the most rigorously validated field assessments in exercise science.

Target Demographic & Facility Requirements

• Target Population: Adults (Kline's validation sample was 30 to 69 years). It suits sedentary, overweight or older clients who do not tolerate treadmill grades or stepping.
• The Course: A completely flat, smooth, non-slip track measuring exactly 1.0 mile ($1609\text{ meters}$).
  • On a standard $400\text{-meter}$ running track, 1 mile equals 4 complete laps plus $9.34\text{ meters}$ in Lane 1.
  • Outdoor testing should avoid days with excessive wind ($>15\text{ km/h}$) or extreme ambient heat/humidity, as these environmental variables artificially elevate heart rate.

Protocol Administration Rules

1. Body Mass Measurement: Measure body mass. The original Kline equation uses pounds (${\text{lbs} = \text{kg} \times 2.20462}$). The CSEP-PATH Second Edition (2019) updated the One Mile Walk equation so that mass can be entered in kilograms; the kilogram coefficient is the pound coefficient multiplied by 2.2046.
2. Dynamic Warm-Up: The client completes 5 minutes of light self-paced walking and dynamic lower-extremity mobility exercises.
3. Test Instructions:

1. End-of-Test Data Collection:
   • As the client crosses the 1-mile mark, the timer stops the digital stopwatch and records the elapsed time to the nearest second.
   • Heart Rate Recording: The personal trainer immediately counts the client's 10-second radial pulse within the first $0\text{ to }15\text{ seconds}$ post-walk (or records the immediate reading from a telemetric chest strap).
   • The client performs an active cool-down walk for at least 3 to 5 minutes.

The Rockport Regression Equation

$\dot{V}\text{O}_2\text{max} \; (\text{mL}\cdot\text{kg}^{-1}\cdot\text{min}^{-1}) = 132.853 - (0.0769 \times \text{Weight}) - (0.3877 \times \text{Age}) + (6.315 \times \text{Gender}) - (3.2649 \times \text{Time}) - (0.1565 \times \text{HR})$

Where:

• $\text{Weight}$ = Client's body mass in pounds (lbs) in the original equation (use the kilogram form on the current CSEP-PATH worksheet; both give the same result).
• $\text{Age}$ = Client's age in completed years.
• $\text{Gender}$ = Biological sex coded as 1 for males, 0 for females.
• $\text{Time}$ = 1-mile walk time in decimal minutes (e.g., $14\text{ minutes and }24\text{ seconds} = 14 + \frac{24}{60} = 14.40\text{ minutes}$).
• $\text{HR}$ = Immediate post-walk heart rate in beats per minute (bpm) (10-second count multiplied by 6, or telemetry reading).

Step-by-Step Worked Example:

A 55-year-old male weighing $82\text{ kg}$ walks 1 mile in $14\text{ minutes and }36\text{ seconds}$. His immediate heart rate is $144\text{ bpm}$.

1. Convert Weight to lbs: $82\text{ kg} \times 2.20462 = 180.78\text{ lbs}$.
2. Convert Time to Decimal Minutes: $14 + (36 / 60) = 14.60\text{ minutes}$.
3. Parameters: $\text{Weight} = 180.78, \; \text{Age} = 55, \; \text{Gender} = 1, \; \text{Time} = 14.60, \; \text{HR} = 144$.
4. Calculate Component Terms:
   • $0.0769 \times 180.78 = 13.902$
   • $0.3877 \times 55 = 21.324$
   • $6.315 \times 1 = 6.315$
   • $3.2649 \times 14.60 = 47.668$
   • $0.1565 \times 144 = 22.536$
5. Solve Equation: ${\dot{V}\text{O}_2\text{max} = 132.853 - 13.902 - 21.324 + 6.315 - 47.668 - 22.536}$ ${\dot{V}\text{O}_2\text{max} = 33.738 \approx 33.7\text{ mL}\cdot\text{kg}^{-1}\cdot\text{min}^{-1}}$

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Walking Protocol Comparison Table