{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/86852"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/86852","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Diver Physiology and Performance: Effects of Hydration Status, Hyperoxia, and Cold Stress","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Hess, Hayden; 0000-0002-8432-7208"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Hostler, Dave","Exercise and Nutrition Sciences"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02-25T23:23:27Z","date_published":"2025-02-25T23:23:27Z","updated_at":"2026-07-27T19:05:37Z","subjects":["physiology"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/86852","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Hostler, Dave","Exercise and Nutrition Sciences"]},{"key":"dc:creator","label":"Author","values":["Hess, Hayden; 0000-0002-8432-7208"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-02-25T23:23:27Z","2020","2020-08-10 13:20:08"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["physiology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/86852"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","The series of dissertation studies were designed to explore a common special warfare exposure to long, sedentary dives followed by land-based activity. The first goal was to examine the effects of hydration status, breathing gasses, and cold stress on post-immersion aerobic exercise performance. The second goal was to explore the mechanisms that contribute to carbon dioxide (CO2) retention during diving. The first dissertation study revealed that consuming fluids while diving augments immersion-induced diuresis. Additionally, this study showed that thermoneutral head-out water immersion (HOWI) results in mild hypohydration, which has minimal impact on aerobic exercise performance. The second study exposed that cold (10°C) HOWI worsens dehydration, but fluid replacement in this scenario did not restore aerobic exercise performance. Rather, relative hypothermia and deep tissue cooling had negative effects on high-intensity exercise. The third study revealed that immersion-induced hypohydration augments cardiovascular strain during a 60-minute loaded ruck-march and attenuates 5 km time trial performance. However, hyperoxia does not appear to further reduce performance. The fourth and fifth studies examined the widespread hypothesis that an attenuated brief, hypercapnic ventilatory response (CBCO2) contributes to CO2 retention in diving. The fourth study revealed that breathing hyperbaric air or 100% O2 in a dry pressurized environment did not reduce CBCO2. The final study showed that CBCO2 is unchanged during both thermoneutral and cold water immersion. Together, these findings indicate that other mechanisms mediate CO2 retention in diving (e.g., increased dead space). In summary, this dissertation contains many novel findings that further our understanding of the implications of diving on post-immersion performance and the mechanisms contributing to CO2 retention in diving.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Diver Physiology and Performance: Effects of Hydration Status, Hyperoxia, and Cold Stress"]}]}],"canonical_facts":{"dc:contributor":["Hostler, Dave","Exercise and Nutrition Sciences"],"dc:creator":["Hess, Hayden; 0000-0002-8432-7208"],"dc:date":["2025-02-25T23:23:27Z","2020","2020-08-10 13:20:08"],"dc:description":["Ph.D.","The series of dissertation studies were designed to explore a common special warfare exposure to long, sedentary dives followed by land-based activity. The first goal was to examine the effects of hydration status, breathing gasses, and cold stress on post-immersion aerobic exercise performance. The second goal was to explore the mechanisms that contribute to carbon dioxide (CO2) retention during diving. The first dissertation study revealed that consuming fluids while diving augments immersion-induced diuresis. Additionally, this study showed that thermoneutral head-out water immersion (HOWI) results in mild hypohydration, which has minimal impact on aerobic exercise performance. The second study exposed that cold (10°C) HOWI worsens dehydration, but fluid replacement in this scenario did not restore aerobic exercise performance. Rather, relative hypothermia and deep tissue cooling had negative effects on high-intensity exercise. The third study revealed that immersion-induced hypohydration augments cardiovascular strain during a 60-minute loaded ruck-march and attenuates 5 km time trial performance. However, hyperoxia does not appear to further reduce performance. The fourth and fifth studies examined the widespread hypothesis that an attenuated brief, hypercapnic ventilatory response (CBCO2) contributes to CO2 retention in diving. The fourth study revealed that breathing hyperbaric air or 100% O2 in a dry pressurized environment did not reduce CBCO2. The final study showed that CBCO2 is unchanged during both thermoneutral and cold water immersion. Together, these findings indicate that other mechanisms mediate CO2 retention in diving (e.g., increased dead space). In summary, this dissertation contains many novel findings that further our understanding of the implications of diving on post-immersion performance and the mechanisms contributing to CO2 retention in diving.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/86852"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["physiology"],"dc:title":["Diver Physiology and Performance: Effects of Hydration Status, Hyperoxia, and Cold Stress"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:37Z"}