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Date of Graduation
Master of Science (MS)
Purpose: To determine if changing the length of the recovery stage influences the effectiveness, or ability to confirm maximal oxygen consumption (VO2max), of the verification phase and if the initial intensity of the stage has an impact on its effectiveness. Methods: 27 subjects (20 males and 7 females) performed four separate VO2max tests separated by at least 48 hours. For each initial graded exercise test, starting speed was 3.0 mph and increased by 0.5 mph every minute until 6.0 mph was reached. After this point, elevation was increased by 3.0% every minute until volitional exhaustion. VO2 was continuously tracked using a Parvomedics metabolic measurement system. Heart rate and RPE was gathered at the end of every minute. The highest 30s average achieved during the graded exercise test was defined as VO2max for the incremental test (iVO2max). Four different verification stages followed and included combinations of short (5-min) and long (15-min) rest periods, and submaximal (one stage beneath maximal workload) and supramaximal (one stage above maximal workload) intensities. Results: There were no significant difference between iVO2max and verification VO2max (vVO2max) across all protocols. RER was lower (P < 0.05) during the verification stage compared to the graded exercise test for the long/submaximal and short/supramaximal protocol. HRmax was similar between GXT and short/submaximal verification stage, whereas the other three verification protocols elicited lower HRmax values. Average verification RPE was significantly higher than average GXT RPE for the long/supramaximal protocol. Though VO2max was not different between GXT and verification stage, the short/submaximal protocol resulted in 81.5% of subjects with vVO2max the same or higher than iVO2max. Conclusion: Based on fewer tests with vVO2max < iVO2max, it may be preferable to use shorter rest periods with submaximal initial intensity for verification stages.
Foster, Andrew, "The effect of intensity and duration of verification stages on the efficacy of VO2max testing" (2022). Masters Theses, 2020-current. 163.
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