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Title: Haemodynamic responses in active and inactive muscle during exercise as measured by near infrared spectroscopy
Author: Deacon, Greg
Awarding Body: University of Essex
Current Institution: University of Essex
Date of Award: 2013
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Based upon the premise that both exercising (E) and non-exercising (NE) muscle play major roles during exercise, oxygen consumption and blood flow (BF) have been extensively monitored at the tissue level. Near infrared spectroscopy is a non-invasive technique that measures haemodynamic changes within muscle, indicating very specific oxygenation patterns and blood distribution. This series of studies investigated, initially, the contribution of E and NE arm muscle during small muscle mass, upper body activity (one-arm cranking) and, subsequently, greater muscle mass exercise (traditional leg cycling with (G) or without (NG) grip). The initial pilot study determined considerable differences between oxygenation status in both E and NE triceps brachii (TB) and biceps brachii as exercise intensity increased and concluded further investigation was warranted in TB. Study 2 confirmed that NE tissue suffered reduced oxygen supply at workloads above 70% peak power (PP), the E TB deoxygenating at intensities between 40% and 60% PP. The wearing of a restraint made little difference to stabilization at the highest intensities and increased activity was found within the NE ann. Study 3 concluded that a probable initial metabolite increase had an effect on NE tissue, although only at the highest workload (70% PP), a reflection of lactate (La) consumption. However, in contrast, E muscle was influenced between the two lower intensities (40% and 60% PP). BY increased in both E and NE tissue. Study 4 isolated the forearm and noted significant haemodynamic changes in NG at the highest work intensities, but also that body position effected leg oxygenation. It is proposed that a balance between vasoconstriction and vasodilation, instigated by La production, exists to redistribute BF. The withdrawal of the vasoconstictory signal post-exercise adjusts BF to E and NE arm tissue similarly. The NE tissue, therefore, plays a diverse, yet vitally important role during exercise and recovery.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available