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Relationship of excess post-exercise oxygen consumption to VO₂max and recovery rate

University of British Columbia

The purpose of this study was to examine (i) the relationship between Excess Post-Exercise Oxygen Consumption (EPOC), peak blood lactate [BLa], and a measure of the fast and slow components of recovery (ɽ1 and ɽ2) and aerobic capacity (VO₂max) using three different supramaximal treadmill tests, and (ii) the effects of varying intensity and duration of supramaximal work on EPOC. Twelve males (mean: age=23.9 y, ht= 183.7 cm, wt=82.2 kg) performed a V0₂max and three anaerobic speed tests (ASTs). The ASTs represented a controlled intensity test (20% grade), a fixed duration test (2 min.), and a fixed intensity and duration test (15%-1 min.). No significant relationships were found between V0₂max, EPOC, rate (ɽ1 and ɽ2), or peak blood lactate. However, significant relationships were evident between anaerobic capacity and EPOC 20% (r=.74, p<.01) and EPOC 2 min (r=.62, p<.05). ANOVA revealed a significant difference for EPOC (15%- 1 min; 7.56 1) with EPOC (2 min; 9.29 1) and EPOC (20%; 9.04 1). [BLa] for EPOC (2 min; 15.74 mmol-1⁻¹) was significantly different (p<.05) from EPOC (20%; 13.62 mmol-1⁻¹) and EPOC (15%- 1 min; 13.01 mmol-1⁻¹). No significant differences were evident between ɽ1 and ɽ2 across the 3 ASTs. These findings suggest that the rate and magnitude of recovery from supramaximal work are independent of V0₂max, however, magnitude was dependent on anaerobic capacity. Recovery rates were similar for the same subject across varying degrees of anaerobic work, indicating a fixed rate of recovery despite changes in exercise condition of a supramaximal nature. This demonstrates the effects of both intensity and duration on EPOC. Finally, the absence of a lactate-EPOC relationship does not lend support for lactate as a major contributor to the presence of an elevated oxygen consumption post-exercise.

Thesis/Dissertation

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2009-02-12

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http://hdl.handle.net/2429/4510

Human Kinetics

University of British Columbia

UBCV

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