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Investigating Autonomic Nervous System Regulation and Cardiovascular Function in Response to Overreaching in Endurance Athletes

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Title: Investigating Autonomic Nervous System Regulation and Cardiovascular Function in Response to Overreaching in Endurance Athletes
Author: Coates, Alexandra
Department: Department of Human Health and Nutritional Sciences
Program: Human Health and Nutritional Sciences
Advisor: Burr, Jamie
Abstract: The purpose of this research was to investigate alterations to cardiovascular and autonomic function, and to assess typical heart rate monitoring techniques, among overreached endurance athletes. Twenty-six triathletes and cyclists completed either a 3-week overload (OL:n=13), or 3-week regular training protocol (CON:n=13), with reduced loads pre-and-post training. Overload athletes displayed reduced peak power, reduced maximal heart rate, and reduced mood states following training, indicative of overreaching. There were no changes to resting heart rate variability (HRV) or a novel measure of cardiac vagal tone (CVT). However, from an autonomic perspective, OL athletes demonstrated increased heart rate recovery post exercise, as well as increased muscle sympathetic nerve activity in a subgroup at rest. From a cardiovascular perspective, OL athletes had increased arterial stiffness, which was associated with decreased cardiac output during exercise. Altogether these results demonstrate significant cardiovascular and autonomic dysregulation with overreaching, that is not reflected with standard HRV monitoring.
URI: http://hdl.handle.net/10214/11507
Date: 2017-08
Rights: Attribution-NonCommercial-NoDerivs 2.5 Canada


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Attribution-NonCommercial-NoDerivs 2.5 Canada Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 2.5 Canada