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Fall 2006 Exercise Physiology 05.476 Dr. Andreacci Field Laboratory: Predicting VO2max from sub-maximal tests ROCKPORT 1-MILE WALK TEST REFERENCE: Source: Exercise Physiology Laboratory Manual (4th ed.). Gene Adams, McGraw-Hill Publishers, New York, NY. 2002. INTRODUCTION: Aerobic run/walk tests are the most common field tests of cardiorespiratory fitness. These tests use minimal equipment, allow testing of large groups, and are easy to administer. Despite their value in measuring functional fitness, field tests are not usually considered replacement tests for the direct measurement of oxygen consumption in research studies. Tests that prescribe walking may be most prudent for middle-aged and older adults because walking is a moderate exercise that is less stressful to the joints. The American College of Sports Medicine (ACSM) does not feel a need to recommend a medical examination for apparently healthy adults prior to performing tests of moderate exercise. The Rockport 1.0 Mile Walk Test predicts aerobic fitness for individuals of all ages. This test incorporates the time to finish the walk, exercise heart rate, body mass, age, and gender into an equation to predict aerobic fitness. RATIONALE: Oxidative metabolism predominates for events that last for about two or more minutes. Oxygen is transported first by the respiratory (pulmonary) system to the cardiovascular system, and then to the contracting muscles. The muscles consume the oxygen in order to provide sufficient amounts of ATP for the muscle contraction (i.e. the myosin filaments pulling on the actin filaments). Without sufficient oxygen, there is not enough ATP produced to sustain muscular action beyond a couple of minutes. Thus, other factors being equal, the runner who can supply the highest rate of oxygen to the muscles will be able to perform aerobic exercise at a faster speed. The highest possible rate of oxygen consumption is called the maximal oxygen consumption (VO2max). METHODS: Facility: The Rockport 1-Mile Walk Test will be performed on the Redman Stadium Track. Each lap around the track is 400 meters in length. Therefore, the walker must go 10 yards (approximately 10 full steps) beyond 4 laps for the 1-Mile Test. IMPORTANT: use the inside lane of the track – Page 1 Fall 2006 Exercise Physiology 05.476 Dr. Andreacci about 1 foot from the curb. In the case of inclement weather an alternative option for the test is a treadmill. Equipment: The only equipment that is absolutely necessary to conduct the test is a watch with a second hand. For greater accuracy in measuring heart rate (HR), an electronic Polar HR monitor may be used. PROCEDURES: The Rockport Walk Test Each student must first fill out a PAR-Q questionnaire (See my webpage for PAR-Q) prior to the exercise test and give it to Dr. Andreacci. This questionnaire helps to disclose persons who deserve cautionary measures or special guidance. Select a partner to record your 1-mile time and post-exercise HR. Have your partner weigh you in your walking attire. At the “GO!” signal, all participants begin walking as fast as possible for one mile around the track. This will be done in two groups (you and then your partner). HR is taken by your partner by electronic monitoring immediately upon crossing the 1 mile mark. If using radial pulse for HR determination, measure HR for 15s immediately after completion and multiply that number by 4 to get beats/minute. Dr. Andreacci will yell out the participants’ time to the closest second. Recorders should write down your partner’s time and later convert it to the nearest hundredth minute. For example, if the participant finishes in 13 minutes 30 seconds, then that time is converted to the nearest hundredth minute by dividing the seconds (30) by 60 seconds. Thus, the time is 13.50 minutes. During inclement weather the test can be completed on a treadmill. Walk 1-mile as fast as you can by adjusting the speed of the treadmill (do not jog or run). The grade must remain at 0% for the entire 1-mile test. Record time from the computer display and HR at the completion of the test. Calculate VO2max (ml·kg-1·min-1) according to the following equation for collegians. VO2max (ml·kg-1·min-1) = 88.768 + 8.892 (gender) – 0.0957 (BM lb) – 1.4537 (T) – 0.1194 (HR) where: gender = 0 for women, and 1 for men BM = body mass (pounds) in walking shoes Page 2 Fall 2006 Exercise Physiology 05.476 Dr. Andreacci T = time to walk 1 mile (converted to nearest hundredth minute) HR = immediate post-exercise HR (beats/min) Compare your calculated aerobic fitness levels to the values in Table I. Page 3 F

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