The reliability of running economy among trained distance runners and field-based players

Publication date: December 2012 Source:Journal of Exercise Science & Fitness, Volume 10, Issue 2 Author(s): Kenji Doma , Glen B. Deakin , Anthony S. Leicht , Rebecca M. Sealey While the reliability of running economy (RE) has been widely established, limited investigation has been carried out into the reliability of various performance variables during a RE test. Subsequently, the purpose of the current study was to examine the reliability of time-to-exhaustion (TTE) and rating of perceived exertion (RPE) during a RE test among trained runners and moderately endurance-trained men. Absolute V ˙ O 2 (mL/minute), V ˙ O 2 relative to body mass (mL/kg/minute), oxygen cost of running (CR) defined as V ˙ O 2 relative to body mass raised to the power of 0.75 per meter (ml kg−0.75/m), heart rate (HR), ventilation ( V ˙ E ) , carbon dioxide production ( V ˙ CO 2 ) , respiratory exchange ratio and RPE were measured while treadmill running on two occasions at three discontinuous incremental speeds corresponding to 70%, 90%, and 110% of the second ventilatory threshold (VT2). The duration of the last increment was measured as TTE. The reliability was determined using the intraclass correlation coefficient (ICC) and 95% ratio limits of agreement. The intraindividual variability was examined using the coefficient of variation (CV). There were no significant differences between the two RE trials for absolute V...
Source: Journal of Exercise Science and Fitness - Category: Sports Medicine Source Type: research