{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/85494"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/85494","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Development and Application of Magnetic Resonance Imaging Techniques for the Study of Exercise-Induced Angiogenesis in the Rat Brain","abstract":"In this study we show that chronic exercise leads to alterations in hemodynamic variables in the rat motor cerebral cortex. To accomplish this, we have performed functional imaging experiments in groups of rats allowed either to exercise or remain inactive for a thirty-day period. We have looked at changes in the local deoxyhemoglobin concentrations using T2*-weighted imaging, changes in blood flow, and changes in blood volume occurring as a result of this period of exercise. Based on these experiments, we have found that exercised animals have a greater concentration of deoxyhemoglobin within the motor cortex than control animals. At baseline conditions blood flow is similar for both groups but in animals that have exercised, a greater blood volume is found within the motor cortex. Taken together, these results are consistent with a greater density of capillaries within the motor cortex of exercised animals, the additional vessels being perfused with blood (both plasma and RBCs). In addition, we can conclude from these results that the linear velocity of flowing blood within the motor cortical capillaries of animals that have exercised is slower at baseline conditions than in control animals. Under hypercapnic conditions we have found that both blood flow and volume are increased in exercised animals relative to controls. This is consistent with a larger cerebrovascular reserve in the animals that have exercised as would be expected with a more dense capillary bed. In addition to reporting these results we have proposed novel techniques for both blood flow and volume imaging that can be used for future studies of this kind.","abstract_html":"In this study we show that chronic exercise leads to alterations in hemodynamic variables in the rat motor cerebral cortex. To accomplish this, we have performed functional imaging experiments in groups of rats allowed either to exercise or remain inactive for a thirty-day period. We have looked at changes in the local deoxyhemoglobin concentrations using T2*-weighted imaging, changes in blood flow, and changes in blood volume occurring as a result of this period of exercise. Based on these experiments, we have found that exercised animals have a greater concentration of deoxyhemoglobin within the motor cortex than control animals. At baseline conditions blood flow is similar for both groups but in animals that have exercised, a greater blood volume is found within the motor cortex. Taken together, these results are consistent with a greater density of capillaries within the motor cortex of exercised animals, the additional vessels being perfused with blood (both plasma and RBCs). In addition, we can conclude from these results that the linear velocity of flowing blood within the motor cortical capillaries of animals that have exercised is slower at baseline conditions than in control animals. Under hypercapnic conditions we have found that both blood flow and volume are increased in exercised animals relative to controls. This is consistent with a larger cerebrovascular reserve in the animals that have exercised as would be expected with a more dense capillary bed. In addition to reporting these results we have proposed novel techniques for both blood flow and volume imaging that can be used for future studies of this kind.","abstract_has_math":false,"creators":["Harris, Andrew Burthe"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Biophysics and Computational Biology","degree_department":null,"school":null,"contributors":["Lauterbur, Paul C."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-25T22:46:16Z","date_published":"2015-09-25T22:46:16Z","updated_at":"2026-07-22T22:26:25Z","subjects":["Biology, Animal Physiology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9953038"],"render_values":[{"text":"(MiAaPQ)AAI9953038","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/85494","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Lauterbur, Paul C."]},{"key":"dc:creator","label":"Author","values":["Harris, Andrew Burthe"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-25T22:46:16Z","10000-01-01","1999"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Biophysics and Computational Biology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Biology, Animal Physiology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/85494","(MiAaPQ)AAI9953038"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["In this study we show that chronic exercise leads to alterations in hemodynamic variables in the rat motor cerebral cortex. 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In addition, we can conclude from these results that the linear velocity of flowing blood within the motor cortical capillaries of animals that have exercised is slower at baseline conditions than in control animals. Under hypercapnic conditions we have found that both blood flow and volume are increased in exercised animals relative to controls. This is consistent with a larger cerebrovascular reserve in the animals that have exercised as would be expected with a more dense capillary bed. In addition to reporting these results we have proposed novel techniques for both blood flow and volume imaging that can be used for future studies of this kind.","Made available in DSpace on 2015-09-25T22:46:16Z (GMT). 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To accomplish this, we have performed functional imaging experiments in groups of rats allowed either to exercise or remain inactive for a thirty-day period. We have looked at changes in the local deoxyhemoglobin concentrations using T2*-weighted imaging, changes in blood flow, and changes in blood volume occurring as a result of this period of exercise. Based on these experiments, we have found that exercised animals have a greater concentration of deoxyhemoglobin within the motor cortex than control animals. At baseline conditions blood flow is similar for both groups but in animals that have exercised, a greater blood volume is found within the motor cortex. Taken together, these results are consistent with a greater density of capillaries within the motor cortex of exercised animals, the additional vessels being perfused with blood (both plasma and RBCs). In addition, we can conclude from these results that the linear velocity of flowing blood within the motor cortical capillaries of animals that have exercised is slower at baseline conditions than in control animals. Under hypercapnic conditions we have found that both blood flow and volume are increased in exercised animals relative to controls. This is consistent with a larger cerebrovascular reserve in the animals that have exercised as would be expected with a more dense capillary bed. In addition to reporting these results we have proposed novel techniques for both blood flow and volume imaging that can be used for future studies of this kind.","Made available in DSpace on 2015-09-25T22:46:16Z (GMT). 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