Resumen de Aproposed Test for Determining Physical Working Capacity at the Oxigen Consumption Threshold (PWC vo2)
Joshua Miller, Terry J. Housh, Jared W. Coburn, Joel T. Cramer, Glen O. Johnson
The purpose of this study was 3-fold: (a) to determine if the mathematical model used to estimate the electromyographic fatigue threshold (EMGFT) and physical working capacity at the heart rate threshold (PWC HRT) could be applied to V02 measurements, (b) to propose a new fatigue threshold called the physical working capacity at the oxygen consumption threshold (PWC V O2), and (c) to compare the power output at the to those of the EMGFTP, PWC HRT, and ventilatory threshold (VT). Fifteen adult volunteers (mean age +- SD = 22 +- 2 years) performed a maximal cycle ergometer test to determine VO2 peak and VT as well as 4 8-minute submaximal work bouts for the determination of PWC HRT, EMG FT, and PWC VO2. A 1-way repeated measures analysis of variance (ANOVA) with Tukey post hoc comparison indicated that PWCHRT (84 +- 36) was significantly (p < 0.05) less than EMGFT (126 +- 51), but there were no differences for (111 +- 44) and VT (111 +- 60) versus PWC HRT or EMGFT PWC V O2 .
The results of this study indicated that (a) the mathematical model used to determine the PWCHRT and EMGFT was applicable to the measurement of V O2 and could be used to estimate the PWC V O2 during cycle ergometry, (b) there was a difference in the mean power outputs that corresponded to the fatigue thresholds determined from EMG and heart rate measurements, and (c) the PWC V O2 test may provide a useful submaximal technique for estimating the VT.
