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Analysis of square-wave bouts to verify VO2max
D Sedgeman1, L Dalleck, I E Clark
1Department of Human Performance, Minnesota State University, Mankato, United States.
Both submaximal and supramaximal verification bouts effectively measure maximal oxygen uptake (VO2max) following a graded exercise test (GXT). These protocols demonstrate similar statistical consistency, making them equally effective for VO2max assessment.
Area of Science:
- Exercise Physiology
- Sports Science
- Cardiorespiratory Fitness Assessment
Background:
- Maximal oxygen uptake (VO2max) is a key indicator of cardiorespiratory fitness.
- Square-wave exercise bouts are utilized to verify VO2max achieved during graded exercise tests (GXTs).
- Limited data exists on the statistical consistency between submaximal and supramaximal verification bouts within the same participants.
Purpose of the Study:
- To analyze the statistical consistency of submaximal and supramaximal square-wave verification bouts performed immediately after a GXT.
- To compare the effectiveness of these two verification methods for determining VO2max.
Main Methods:
- 13 participants (6 males, 7 females) completed a GXT on two separate occasions.
- Following the GXT, participants performed either a submaximal (end-GXT power minus 2 stages) or a supramaximal (105% end-GXT power) exhaustive square-wave bout.
- VO2max, typical error, and intraclass correlation coefficients (ICC) were calculated for each protocol.
Main Results:
- No significant differences in VO2max were found between the GXT and either square-wave verification bout (p>0.05).
- Typical error values for VO2max were similar for submaximal (1.09 ml/kg/min) and supramaximal (1.04 ml/kg/min) trials.
- Relative consistency measures (ICC and CV) were comparable between submaximal (ICC=0.97, CV=2.4%) and supramaximal (ICC=0.95, CV=2.3%) trials.
Conclusions:
- For GXT protocols lasting approximately 10-12 minutes, both submaximal and supramaximal square-wave verification bouts are equally effective in determining VO2max.
- The choice between submaximal and supramaximal verification protocols does not significantly impact the reliability of VO2max measurements.
- These findings support the interchangeable use of both verification methods for assessing cardiorespiratory fitness.
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