QUANTIFYING OXYGEN DEFICIT AND TOTAL

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Author
Allen, James
Date
2014Type
Dissertation
Publisher
Cardiff Metropolitan University
Metadata
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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.
Description
DEGREE OF BACHELOR OF SCIENCE (HONOURS)
INTERCALATED SPORT AND EXERCISE SCIENCE
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