Change in the Proportion of Energy Supplied by Aerobic and Anaerobic Sources as an Explanation of the Slow Component of Oxygen Uptake

Date
2015-12-22
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Abstract
Purpose: To investigate a shift in the proportion of energy supplied through aerobic vs anaerobic metabolism as an explanation of the slow component of oxygen uptake. Methods: Pulmonary data were collected to assess the ventilation and aerobic energy contribution during constant power cycling rides. Blood lactate was measured to estimate anaerobic energetic contribution. EMG was recorded to evaluate changes in co-contraction and accessory muscle use. Results: Over time, anaerobic contributions decreased while aerobic contributions increased, presumably to compensate. Other than that required for an increasing rate of ventilation, the energy cost of activity was not different between 3-6 and 6-9 minutes of exercise. There were no changes in muscle activation consistent with no true increase in energy cost. Conclusion: These findings support the idea that the slow component can be explained by a greater proportion of energy supplied aerobically without an increasing energy cost above that required for an increase in ventilation.
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Physiology
Citation
O'Connell, J. (2015). Change in the Proportion of Energy Supplied by Aerobic and Anaerobic Sources as an Explanation of the Slow Component of Oxygen Uptake (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca. doi:10.11575/PRISM/25248