| Autor: |
Green GK; School of Kinesiology, Recreation & Sport, Western Kentucky University, Bowling Green, KY, USA., Stone WJ; School of Kinesiology, Recreation & Sport, Western Kentucky University, Bowling Green, KY, USA., Tolusso DV; School of Kinesiology, Recreation & Sport, Western Kentucky University, Bowling Green, KY, USA., Schafer MA; School of Kinesiology, Recreation & Sport, Western Kentucky University, Bowling Green, KY, USA., Lyons TS; School of Kinesiology, Recreation & Sport, Western Kentucky University, Bowling Green, KY, USA.; Department of Kinesiology, University of North Alabama, Florence, AL, USA. |
| Abstrakt: |
The Bruce and Astrand treadmill protocols are commonly utilized when assessing maximal oxygen consumption (VO 2max ). However, the steep grade implemented in the protocols often leads to localized muscular fatigue, potentially causing participants prematurely to terminate the test prior to reaching their true VO 2max . The purpose of this study was to evaluate a Novel VO 2max protocol that may be better suited for young, apparently healthy populations. The Novel protocol starts at a higher speed and lower initial grade to limit lower extremity fatigue. Fifteen participants performed the Bruce, Astrand, and Novel protocols with the following maximal values recorded from each: VO 2max , maximal ventilation (VE max ), respiratory exchange ratio (RER), heart rate (HR), rating of perceived exertion (RPE) and time to exhaustion (TTE). The Novel protocol displayed substantial agreement with both criterion protocols. Mean absolute percent error (MAPE) was less than 10% indicating that the Novel protocol is a valid measurement for VO 2max values. Bland-Altman analysis revealed that the Novel protocol exhibited a low degree of bias, with tight limits of agreement when compared to the Bruce (bias ±95% LOA = 0.824 ± 3.163) and Astrand protocols (-0.153 ± 3.528) for VO 2max . A paired samples t -test revealed no significant differences between Novel and criterion protocols for VO 2max . Paired samples t -tests revealed that the Novel protocol had significantly lower TTE when compared to the Bruce and Astrand protocols and produced similar VO 2max values to that of the Bruce and Astrand. The Novel protocol may be considered a valid and time-efficient protocol. |
