C-40 Free Communication/Poster - Predictive Modeling Thursday, June 2, 2016, 7: 30 AM - 12: 30 PM Room: Exhibit Hall A/B
Determining Validity Of A Self-Paced VO2max Test For Estimating Anaerobic Capacity
1591 Board #244 June 2, 9
00 AM - 10
Recent evidence has shown that self-paced VO2max treadmill tests (SPV) can produce similar VO2-power relationships as traditional incremental treadmill tests. The endspurt during the last stage of SPV may be a surrogate for a supramaximal test. Pairing the SPV VO2-power relationship and endspurt may allow for the calculation of a correlated measure to maximal accumulated oxygen deficit (MAOD) and the potential to determine aerobic power and anaerobic capacity in a single task.
PURPOSE: To determine if SPV can produce a correlated measure to MAOD using data available only from the SPV test.
METHODS: Seventeen male subjects (age 25 ± 5 years, VO2max 62.3 ± 9.2 ml*kg-1*min-1) completed four submaximal exercise tests to determine a VO2-power relationship. MAOD was measured during a supramaximal exercise bout. An SPV was completed on an automated treadmill with VO2-power relationship determined from stages 2-4. For both relationships, y-intercept was set at 5.1 ml*kg-1*min-1. Accumulated oxygen deficit (AOD) was determined for SPV stage 5 as the sum of each 15 second O2 deficit until estimated O2 demand fell below O2 uptake. Peak power was taken as the highest 15 second average throughout. VO2 was calculated using 15 second averages.
RESULTS: Eight subjects produced an endspurt during stage 5 of SPV and were included in the analysis. The supramaximal exercise test lasted 2.48 ± 0.40 min and MAOD averaged 39.2 ± 7.1 ml*kg-1. VO2-power relationship slopes for submaximal stages (0.2507 ± 0.0203) and SPV stages (0.2597 ± 0.0200) were significantly different (p = 0.043) and significantly correlated (r = 0.828, p = 0.011). However, SPV stage 5 AOD (104.9 ± 114.8 ml*kg-1) and peak power (271 ± 25 watts) were not correlated with MAOD (r = 0.637, p = 0.090; r = 0.519, p = 0.187, respectively).
CONCLUSIONS: Not all subjects choose to produce their maximal power upon initiation of stage 5 and thus do not produce an endspurt. Measures from stage 5 of SPV hypothesized to estimate anaerobic capacity did not correlate with MAOD. It is possible that the ability to alter power output throughout SPV, akin to overland running, may have altered the VO2-power relationship enough to reduce the validity of the accumulated oxygen deficit measure. Accordingly, it appears that anaerobic capacity cannot be estimated using a single SPV treadmill test.© 2016 American College of Sports Medicine