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Unformatted text preview: Maximal Exercise Testing Using the Elliptical Cross-trainer and Treadmill 94 JEP online Journal of Exercise Physiology online Official Journal of The American Society of Exercise Physiologists (ASEP) ISSN 1097-9751 ISSN 1097-9751 An International Electronic Journal Volume 7 Number 3 June 2004 Equipment Testing and Validation MAXIMAL EXERCISE TESTING USING THE ELLIPTICAL CROSS-TRAINER AND TREADMILL LANCE C. DALLECK, LEN KRAVITZ, ROBERT A. ROBERGS Exercise Physiology Laboratories, the University of New Mexico, Albuquerque, NM ABSTRACT MAXIMAL EXERCISE TESTING USING THE ELLIPTICAL CROSS-TRAINER AND TREADMILL. Lance C. Dalleck, Len Kravitz, Robert A. Robergs . JEP online 2004;7(3):94-101. The purpose of this study was to compare the physiological responses during incremental exercise to fatigue using the elliptical cross-trainer and treadmill running. Twenty recreationally active individuals (10 men and 10 women, mean age, height, weight, and body composition = 29.57.1 yr, 173.312.6 cm, 72.37.9 kg, and 17.35.0 BF%) completed two randomized VO 2 max tests: treadmill and Precor elliptical cross-trainer separated by 1-3 days. Breath-by-breath data were collected using a fast response turbine flow transducer and custom developed software with AEI oxygen and carbon dioxide electronic gas analyzers. All breath-by-breath data were smoothed using a 7-breath moving average. Criteria for attainment of VO 2 max included two of the following: respiratory exchange ratio (RER) > 1.1, maximal heart rate (HR) within 15 b/min of the calculated value, or VO 2 plateau ( VO 2 < 50 mL/min with an increase in power output). Paired t-tests were performed to determine mean differences between VO 2 max, maximal HR, maximal RER, and protocol duration. No significant differences (p>0.05) were found in VO 2 max (47.9 vs . 47.3 ml/kg/min), maximal HR (186 vs . 184 b/min), maximal RER (1.22 vs . 1.25), and protocol duration (11.56 vs . 12.17 min) between elliptical crosstraining and treadmill running. In conclusion, this study revealed that the elliptical cross- trainer produced similar maximal physiological values compared to treadmill running during VO 2 max testing. Key Words: Maximal oxygen consumption (VO 2 max), Maximal heart rate (MHR), E xercise mode INTRODUCTION Maximal Exercise Testing Using the Elliptical Cross-trainer and Treadmill 95 Table 1. Subject Characteristics (n=20) Parameter Measurement Age (years) 29.5 7.1 Height (cm) 173.3 12.6 Weight (kg) 72.3 7.9 Body Composition (%) 17.3 5.0 Maximal oxygen uptake (VO 2 max) is a fundamental measurement for the exercise physiologist (1). VO 2 max refers to the highest rate at which oxygen can be taken up and consumed by the body during intense exercise (2). Traditionally, the magnitude of an individuals VO 2 max has been viewed as a measure of aerobic fitness and overall health. Studies have consistently demonstrated an inverse relationship between VO 2 max values and risk of all-cause mortality (3-4). max values and risk of all-cause mortality (3-4)....
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