Date of Graduation

5-2015

Document Type

Thesis

Degree Name

Bachelor of Science Education

Degree Level

Undergraduate

Department

Health, Human Performance and Recreation

Advisor/Mentor

Ganio, Matthew S.

Committee Member/Reader

Kavouras, Stavros

Committee Member/Second Reader

Fort, Inza L.

Abstract

Context: There is an inverse relationship between baseline arterial stiffness and the change in arterial stiffness with passive heating. However, it is unknown whether this relationship is affected by dehydration. Objective: To investigate the effect of acute dehydration on arterial stiffness during passive heat stress. Design: Two randomized counter-balanced trials. Setting: Laboratory. Patients or Other Participants: Eleven healthy males (age=24.5 ± 2.8 years, body mass=76.6 ± 9.1 kg, body fat=16.8 ± 6.4%). Interventions: In one trial subjects were dehydrated (DE) and in another euhydration (EU) was maintained during passive heating to a 1.5°C increase in body temperature. Subjects were euhydrated prior to each trial confirmed via urine specific gravity (USG)0.05). A significant negative relationship (p < 0.01) was observed between baseline arterial stiffness and changes during heating in EU cPWV (r = -0.61), pPWV (r = -0.70), and DE pPWV (r = -0.55), but not DE cPWV (r = -0.09; p = .61). The relationships between baseline stiffness and changes in heating were not significantly different between EU and DE trials (p > 0.05). Conclusions: Passive heat stress decreases peripheral, but not central arterial stiffness independent of hydration status. Acute dehydration that occurs with passive heating does not affect arterial stiffness in young, healthy males.

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