Journal
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Volume 114, Issue 3, Pages 467-479Publisher
SPRINGER
DOI: 10.1007/s00421-013-2652-5
Keywords
Skin blood flow; Exercise; Heat stress; Blood pressure; Cardiac output
Categories
Funding
- NHLBI NIH HHS [R01 HL089302] Funding Source: Medline
- NIA NIH HHS [R01 AG007004] Funding Source: Medline
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When prolonged intense exercise is performed at high ambient temperatures, cardiac output must meet dual demands for increased blood flow to contracting muscle and to the skin. The literature has commonly painted this scenario as a fierce competition, wherein one circulation preserves perfusion at the expense of the other, with the regulated maintenance of blood pressure as the ultimate goal. This review redefines this scenario as commensalism, an integrated balance of regulatory control where one circulation benefits with little functional effect on the other. In young, healthy subjects, arterial pressure rarely falls to any great extent during either extreme passive heating or prolonged dynamic exercise in the heat, nor does body temperature rise disproportionately due to a compromised skin blood flow. Rather, it often takes the superimposition of additional stressors-e.g., dehydration or simulated hemorrhage-upon heat stress to substantially impact blood pressure regulation.
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