QUANTIFYING OXYGEN DEFICIT AND TOTAL
Cardiff Metropolitan University
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Objectives: This study quantitatively explored the extent of anaerobic and total energy expenditure during an acute bout of HIIT due to the lack of an accurate non-invasive estimation of anaerobic energy expenditure. This quantification is aimed to both further physiological understanding of energy expenditure and provide a scientific basis for exercise prescription. Method: Six male participants undertook three protocols on an arm crank ergometer; a peak, constant exercise, and interval protocol. Three prediction methods were used to estimate energy expenditure; peak interpolation, 6 minute values (6- min), and 3 minute (3- min) values from constant exercise. These predicted values were then used to quantify oxygen deficit and thus relative aerobic and anaerobic components within the 32.5-min interval session which consisted of six, 2.5-min intervals at 80% Wpeak each interspersed with 2.5-min active recovery at 40% Wpeak. Data were analysed using a standard analysis of variance (ANOVA) and 2-way ANOVA with Bonferroni post-hoc, pairwise comparison tests where appropriate; presented as mean ± standard deviation. Results: The average anaerobic component per interval using the 3 prediction methods were 63.6 (92.4), 30.3 (34.2), and 129.2 (30.1) % for the peak, 3-min and 6-min estimations respectively. The extent of difference in the anaerobic component between 6-min and 3- min prediction methods was statistically significant (P<0.05). Conclusion: The results from this study suggests that by using either the peak or 3-min prediction methods underestimates energy expenditure in HIIT due to the large negative values of oxygen deficit and small anaerobic component found; thus using 6-min of constant exercise is a more accurate prediction method. It is also suggested that a substantial component of HIIT is anaerobic when using a 6-min bout of submaximal exercise to estimate total energy expenditure and is not to be ignored during studies that attempt to calculate total energy expenditure during HIIT exercise.
DEGREE OF BACHELOR OF SCIENCE (HONOURS) INTERCALATED SPORT AND EXERCISE SCIENCE
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