Author : Hayden D. Gerhart
Publisher :
ISBN 13 :
Total Pages : 117 pages
Book Rating : 4.:/5 (128 download)
Book Synopsis Acute Effects of Normobaric Hypoxia and Cold Water Hand Immersion on Thermoregulatory Response and Cognitive Function by : Hayden D. Gerhart
Download or read book Acute Effects of Normobaric Hypoxia and Cold Water Hand Immersion on Thermoregulatory Response and Cognitive Function written by Hayden D. Gerhart and published by . This book was released on 2016 with total page 117 pages. Available in PDF, EPUB and Kindle. Book excerpt: INTRODUCTION: Cold-induced vasodilation (CIVD) is a mechanism that protects the peripheries from cold-related injury. There is a need to elucidate mechanisms that attenuate reduced cognitive and motor performance in hypoxic environments. PURPOSE: The purpose of the present study was to investigate the effects of cold-water hand immersion (CWI) on changes in thermoregulation, measures of CIVD, executive function, mood, and memory in normobaric hypoxia before and following submaximal exercise. METHODS: 10 apparently healthy men (23℗ł3 years) volunteered for this study. The two experimental trials (13% O2, 21% O2) were counterbalanced and blinded from the participants. Following a 60-min. acclimation the experimental trials consisted of two 15-min. exposures to 5℗ðC water of the non-dominant hand. The exposures were separated by a 30-min. bout of submaximal exercise producing the equivalent of 400 watts (W) of metabolic heat. Executive function (Stroop), total mood disturbance (TMD), memory (RMCPT), mean body temperature (MBT), oxygen saturation (SaO2), and thermal sensation (TS) of the arm were collected during the final 5 min. of each stage. CIVD was measured pre- and post-exercise during each of the cold water exposures on the nailbed of the middle finger on the non-dominant hand. RESULTS: No significant interaction or main effects of time or condition were reported for any score of executive function (F = 3.12, p = 0.069) or mood (F = 0.773, p = 0.477). A significant time by condition interaction exists for throughput score (F = 3.19, p = 0.039), a measure of RMCPT. The score during CWI in the 13% O2 condition was significant lower compared to the 21% O2 condition (p = 0.05), as well as when compared to acclimation of the 13% O2 condition (p = 0.02). However, the worsening TMD trend led to positive associations between skin temperature during CWI and TMD scores at baseline (r = 0.753, p = 0.012), acclimation (r = 0.653, p = 0.041), and CWI (r = 0.657, p = 0.039) in the 13% O2 condition. A main effect of time is observed for MBT (F = 42.477, p