Savanna N. Knight1, Lynnsey R. Bowling1, Mac J. Carder2, Eric M. Scudamore2, Veronika Pribyslavska2, Eric K. O'Neal1. 1University of North Alabama, Florence, AL. 2Arkansas State, Jonesboro, AR.

BACKGROUND: This study analyzed differences in VO2max values (L/min, ml/kg/min, and respiratory exchange ratio (RER)) between varying observation windows (OW): 60s, 30s, and 15s. METHODS: Female collegiate cross-country athletes (n=13) completed a singular VO2max test with metabolic data collected via metabolic cart (TrueOne 2400, Parvo Medics Inc., Sandy, UT). Absolute and relative VO2max, as well as RER data, were then analyzed in increments of 60s, 30s, and 15s. Data were analyzed via repeated measures analysis of variance to detect differences between OW. Intraclass correlation (ICC) was also conducted to assess the relationships of the different OW, with 60s serving as the criterion measurement. RESULTS: Regarding absolute VO2max, all three OW were found to be significantly different (p<0.01). Fifteen-second OW was found to have the highest VO2max (3.0 ± 0.3 L/min) compared to 30s and 60s OW (2.9 ± 0.3 and 2.9 ± 0.3 L/min, respectively). Relative VO2max followed a similar trend with significance between all OW (p<0.01) and higher values at 15s (55.4 ± 3.3 ml/kg/min) than 30s or 60s (53.9 ± 2.9 and 53.2 ± 2.8 ml/kg/min, respectively). No significance was found between OW regarding RER values (p=0.38). A strong ICC was found between OW for all variables (absolute VO2max: ICC=0.98, relative VO2max: ICC=0.94, RER: ICC=0.92). CONCLUSIONS: The current study demonstrates that the chosen OW for VO2max reporting may result in discrepancies for reported data. A change in VO2max could occur simply due to the chosen OW, with a smaller OW resulting in an inflated value. Therefore, OW should be considered and reported when conducting a VO2max test in female collegiate cross-country athletes.

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